As filed with the Securities and Exchange Commission on March 24, 2011

Registration No. 333-169584

UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

Amendment No. 7
To
Form S-1
REGISTRATION STATEMENT
UNDER
THE SECURITIES ACT OF 1933

QUARK PHARMACEUTICALS, INC.

(Exact name of registrant as specified in its charter)


California	2834	94-3192416
(State or other jurisdiction of incorporation or organization)	(Primary Standard Industrial Classification Code Number)	(I.R.S. Employer Identification Number)

6501 Dumbarton Circle
Fremont, CA 94555
(510) 402-4020

(Address, including zip code, and telephone number,
including area code, of registrant’s principal executive offices)

Daniel Zurr, Ph.D.
Chief Executive Officer
6501 Dumbarton Circle
Fremont, CA 94555
(510) 402-4020

(Name, address, including zip code, and telephone number,
including area code, of agent for service)

Copies to:

Robert L. Jones
Michael E. Tenta
Cooley LLP
3175 Hanover Street
Palo Alto, CA 94304-1130
(650) 843-5000

Approximate date of commencement of proposed sale to the public: As soon as practicable after the effective date of this registration statement.

If any of the securities being registered on this Form are to be offered on a delayed or continuous basis pursuant to Rule 415 under the Securities Act of 1933, check the following box. o

If this Form is filed to register additional securities for an offering pursuant to Rule 462(b) under the Securities Act, check the following box and list the Securities Act registration statement number of the earlier effective registration statement for the same offering. o

If this Form is a post-effective amendment filed pursuant to Rule 462(c) under the Securities Act, check the following box and list the Securities Act registration statement number of the earlier effective registration statement for the same offering. o

If this Form is a post-effective amendment filed pursuant to Rule 462(d) under the Securities Act, check the following box and list the Securities Act registration number of the earlier effective registration statement for the same offering. o

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, or a smaller reporting company. See the definitions of “large accelerated filer,” “accelerated filer” and “smaller reporting company” in Rule 12b-2 of the Exchange Act. (Check one):


Large accelerated filer o		Accelerated filer o		Non-accelerated filer x		Smaller reporting company o

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The Registrant hereby amends this Registration Statement on such date or dates as may be necessary to delay its effective date until the Registrant shall file a further amendment that specifically states that this Registration Statement shall thereafter become effective in accordance with Section 8(a) of the Securities Act of 1933, as amended, or until the Registration Statement shall become effective on such date as the Commission, acting pursuant to said Section 8(a), may determine.

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The information in this prospectus is not complete and may be changed. We may not sell these securities until the registration statement filed with the Securities and Exchange Commission is effective. This prospectus is not an offer to sell these securities and is not soliciting offers to buy these securities in any state where the offer or sale is not permitted.

SUBJECT TO COMPLETION, DATED MARCH 24, 2011

PRELIMINARY PROSPECTUS

QUARK PHARMACEUTICALS, INC.

Minimum Offering of 30,000 Units
Maximum Offering of 45,000 Units
Each Unit consisting of 100 Shares of Common Stock and 50 Warrants

Quark Pharmaceuticals, Inc. is offering on a best efforts basis a maximum of 45,000 units and a minimum of 30,000 units, with each unit consisting of 100 shares of common stock, par value $0.001 per share, and 50 warrants, with each warrant exercisable into one share of common stock. This is our initial public offering, and no public market currently exists for our units or our common stock or our warrants.

We estimate the offering price of each unit will be between 3,400 New Israeli Shekels (NIS) and 3,800 NIS per unit (which is between 34 NIS and 38 NIS per share and a corresponding one-half of a warrant comprising each unit). The offering price will be determined in an auction process and shall not be lower than 3,400 NIS (approximately $944.44), the minimum price for the purpose of this offering. Unless the offering is fully subscribed at a price higher than the minimum price, the offering will be priced at the minimum offering price. For further details regarding the auction process, see under the heading “Plan of Distribution” beginning on page 133 of this prospectus.

The investors who participate in the auction process, subject to certain conditions, may be able to purchase, at the offering price, an additional allotment of units that does not exceed in the aggregate 15% of the maximum number of units offered in the public tender. For additional details regarding the additional allotment, see under heading “Plan of Distribution” beginning on page 133 of this prospectus.

Each warrant shall be exercisable into one share of our common stock at an exercise price of NIS (approximately $ ) (such amount being equal to 125% of the offering price of one share of common stock and one-half of a warrant comprising a portion of a unit), which exercise price is linked to the representative U.S. dollar exchange rate as determined by the Bank of Israel on and subject to adjustment as described under the heading “Description of Capital Stock'' beginning on page 122 of this prospectus. The warrants will be exercisable for two years from the date on which they are issued. Upon the closing of the offering, the shares of our common stock and the warrants comprising the units will be issued and will trade separately on the Tel Aviv Stock Exchange, or TASE.

The effective price of one share of common stock comprising the units is NIS. The economic value of one warrant comprising the units is approximately NIS. The above-mentioned value of each warrant is based on the formula specified in the TASE guidelines, with a weekly standard deviation based on the Biomed sector as of February 28, 2011 of 6.74%. The annual capitalization rate is 48.60%, according to the capitalization coefficients for March 2011. The offering price per unit will be determined in an auction process on the TASE and shall not be lower than 3,400 NIS (approximately $944.44), the minimum price for the purpose of this offering. Unless the offering is fully subscribed at a price higher than the minimum price, the offering will be priced at the minimum offering price, and if the offering is not subscribed at the minimum offering price, the offering will be cancelled. For further details regarding the auction process, see under the heading “Plan of Distribution” beginning on page 133 of this prospectus. We have appointed a member of the TASE to act as our offering coordinator to administrate the offering. This offering is not underwritten.

The NIS to U.S. dollar exchange rate used for amounts described in this prospectus is the exchange rate determined by the Bank of Israel on March 7, 2011 (which exchange rate is 3.60 NIS per $1.00).

Investing in our common stock involves a high degree of risk. See “Risk Factors” beginning on page 12.

Per Share

Minimum Total

Maximum Total

Public minimum offering price

Distribution commissions

Minimum proceeds, before expenses, to Quark Pharmaceuticals, Inc.

Neither the Securities and Exchange Commission nor any state securities commission has approved or disapproved these securities or determined if this prospectus is truthful or complete. Any representation to the contrary is a criminal offense.

The date of this prospectus is , 2011

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QUARK PHARMACEUTICALS, INC.

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	Page
Summary		1
Risk Factors		12
Forward-Looking Statements		35
Use of Proceeds		36
Dividend Policy		38
Capitalization		39
Dilution		41
Selected Financial Data		43
Management’s Discussion and Analysis of Financial Condition and Results of Operations		45
Business		60
Management		90
Compensation Discussion and Analysis		97
Certain Relationships and Related Party Transactions		117
Principal Shareholders		119
Description of Capital Stock		122
Shares Eligible for Future Sale		128
Material U.S. Federal Income and Estate Tax Consequences to Non-U.S. Holders		130
Plan of Distribution		133
Legal Matters		139
Experts		139
Where You Can Find Additional Information		139
Index to Financial Statements		F-1

You should rely only on the information contained in this prospectus and any free-writing prospectus that we authorize to be distributed to you. We have not authorized anyone to provide you with information different from or in addition to that contained in this prospectus or any related free-writing prospectus. If anyone provides you with different or inconsistent information, you should not rely on it. We are offering to sell, and are seeking offers to buy, shares of common stock only in jurisdictions where offers and sales are permitted. The information contained in this prospectus is accurate only as of the date of this prospectus, regardless of the time of delivery of this prospectus or of any sale of the common stock. Our business, financial conditions, results of operations and prospects may have changed since that date.

This prospectus contains market data and industry forecasts that were obtained from industry publications. We have not independently verified any of this information.

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SUMMARY

This summary highlights selected information appearing elsewhere in this prospectus and does not contain all the information you should consider before investing in our common stock. You should carefully read this prospectus in its entirety before investing in our common stock, including the section entitled “Risk Factors,” and our financial statements and related notes included elsewhere in this prospectus.

Our Business

We are a clinical-stage pharmaceutical company engaged in discovering and developing novel RNAi interference or RNAi-based therapeutics. We have a fully integrated drug development platform that spans therapeutic target identification based on our proprietary gene discovery science and technology, to clinical drug development. We have initially been focusing on RNAi-based therapeutics for the treatment of diseases associated with oxidative stress and ischemic injury. We believe that our insight into the molecular mechanisms underlying these diseases, combined with our ability to design, chemically modify and successfully deliver synthetic small-interfering RNA, or siRNA, to specific organs in the body, enables us to rapidly develop drug candidates, often directed against the same target across multiple therapeutic areas. We have three product candidates in clinical development in five different indications: PF-655 (also called PF-04523655 and previously RTP801i-14) for the treatment of diabetic macular edema and for wet age-related macular degeneration; QPI-1002 (previously I5NP or AKIi-5) for the prevention of acute kidney injury and for the prevention of delayed graft function in kidney transplant patients; and QPI-1007 for ocular neuroprotection. We have licensed PF-655 to Pfizer on an exclusive worldwide basis and we granted an option for an exclusive license to QPI-1002 to Novartis. In March 2011, we received the results of the Phase II DEGAS trial of PF-655 for diabetic macular edema, which demonstrated that the drug was well tolerated, with no observed drug related serious adverse events, and showed a dose dependent improvement in visual acuity over the standard of care. We have a broad pipeline based on our internally developed and proprietary chemically modified siRNA structures. Several of our product candidates are based on novel targets and therapeutic concepts discovered using our BiFAR^TM target gene discovery platform. We believe that our platform technologies, siRNA capabilities and intellectual property combined with expertise of our regulatory, medical, preclinical and clinical development group will enable us to continue to advance new product candidates into clinical development, either directly or through collaborations with major pharmaceuticals companies.

RNAi Overview

RNA interference, or RNAi, is a recently discovered process that occurs naturally within cells and, facilitated by siRNA, selectively silences the activity of specific genes. Genes are the basic units of inheritance. Genes provide cells with instructions for producing proteins encoded by them. Many human diseases are caused by the abnormal behavior of proteins. The ability to stop or reduce production of a protein by selectively silencing the gene that directs its synthesis could be very beneficial in the treatment of disease. We believe that RNAi-based therapeutics potentially have significant advantages over traditional therapies, including broad applicability to treat many diseases, the ability to selectively inhibit expression of disease-associated target genes, inherent drug potency and shortened drug discovery timelines. To date, the major challenges in the development of RNAi-based therapeutics have been delivery of siRNA molecules to the organ and cells relevant to a particular disease as well as siRNA drug specificity, nuclease stability and pro-inflammatory properties associated with innate immune response.

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Our Approach

Our insight into the pathogenesis of diseases, combined with our proprietary targets and concepts and our siRNA delivery strategies, led us to select siRNA as the modality for our clinical programs. We believe that our integrated discovery and development approach, our siRNA technology platform and intellectual property are particularly well-suited to RNAi-based therapeutics and are based on the following main capabilities:

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Identifying clinically attractive drug targets and concepts, often but not exclusively using our BiFAR discovery platform. Using our BiFAR^TM discovery platform, we have identified and validated many gene and protein targets for diseases, including diseases associated with oxidative stress and ischemic injury. Our current clinical programs focus on diseases in organs that we viewed as attractive based on our ability to successfully deliver our siRNA molecules to the target cells in that organ.

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Selection of diseases associated with oxidative stress/ischemic injury across several therapeutic areas for the same target. We believe that our focus on diseases, which share common molecular mechanisms, will enable us to more quickly identify drug candidates capable of treating multiple diseases based on proprietary targets common to diseases in different organs of the body. For example, we have demonstrated in preclinical models that inhibition of the RTP801 gene has beneficial therapeutic effects in various diseases associated with oxidative stress, such as wet age-related macular degeneration in the eye and chronic obstructive pulmonary disease, or COPD in the lung. Furthermore, we have also demonstrated that temporary and reversible inhibition of the gene p53 limits the injury caused by oxidative stress in the kidney and in the inner ear, and thus is potentially useful for the treatment of acute renal failure and acute hearing loss.

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Designing and modifying our siRNA molecules to enable successful local or systemic delivery. Our siRNA drug candidates have a chemically modified, stabilized structure and properties that we believe offer significant advantages over standard siRNAs. In preclinical studies, we have successfully delivered siRNA molecules and suppressed target genes in the back of the eye, inner ear, proximal tubules of the kidney, lung and spinal cord, demonstrating both local and systemic delivery. We select the route of delivery that is clinically relevant for the given organ. Two of our siRNAs were delivered via local administration to the back of the eye in Phase I and Phase II studies. Our QPI-1002 was, according to publicly available information, the first siRNA administered systemically to human patients.

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Optimizing our siRNA molecules for improved potency, stability and selectivity. We use our internally developed siRNA structure and intellectual property to design lead drug candidates with enhanced properties and intellectual property position.

We believe that our approach has the potential to generate several additional Investigational New Drug applications, or INDs, in the coming years, either for new indications for the same drug or for new drugs.

In addition, our BiFAR^TM target discovery platform directly identifies clinically relevant critical genes and proteins that are responsible for certain disease traits, has historically been important to us. We have applied this platform in several disease programs. The application of the BiFAR^TM platform to diseases associated with oxidative stress yielded our pool of proprietary targets from which we have derived part of our current product candidates. In addition, from 1995 through 2005, the BiFAR^TM platform allowed us to generate cash for our operations as well as rights to potential products through agreements with several pharmaceutical companies.

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Our Product Candidates

The following table sets forth the status of our product pipeline:


Product Candidate	Indication	Status	Commercialization Rights
PF-655	Diabetic Macular Edema	Phase II DEGAS study terminated. Phase IIb study expected to be initiated during first half of 2011.	Pfizer (Worldwide)
PF-655	Wet Age-related Macular Degeneration	Phase II MONET study ongoing, enrollment completed. Interim data received in November 2010. Final data expected in the second half of 2011.	Pfizer (Worldwide)
QPI-1002	Acute Kidney Injury	Phase II expected to initiate dosing in the second half of 2011.	Option granted to Novartis for Worldwide rights
QPI-1002	Delayed Graft Function in Kidney Transplant patients	Phase II ongoing (interim analysis expected by mid 2012).	Option granted to Novartis for Worldwide rights
QPI-1007	Non Arteritic Anterior Ischemic Optic Neuropathy	Stratum 2 of Phase I, which may give early indication of the biological activity of QPI-1007, is ongoing. (Dosing and preliminary review of data expected to be completed during the second half of 2011.)	Quark (Worldwide)
QPI-1007	Glaucoma indication	Preclinical toxicity studies initiated to enable Phase II multiple dosing.	Quark (Worldwide)
Program for pipeline siRNAs for neuro protection and neural regeneration	Diseases of the central nervous system, eyes, ears, spinal cord injury, peripheral nerve injuries, neuropathic pain, hearing loss conditions, vestibular diseases.	In vivo proof-of-concept was accomplished in spinal cord injury with a drug candidate with endpoints of post-injury recovery and reduction of neuropathic pain. Further in vivo studies are ongoing in several indications, including glaucoma, hearing loss and others.	Quark (Worldwide)
Program for respiratory system conditions	Acute Lung Injury, Lung Transplantation	In vivo proof-of-concept studies were accomplished in lung transplantation models. Further in vivo studies are ongoing.	Quark (Worldwide)
Program for chronic conditions by systemic administration of siRNA	Chronic Kidney Disease Cancer	Delivery studies and in vivo proof-of-concept studies at various stages.	Quark (Worldwide)

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Product Candidate	Indication	Status	Commercialization Rights
Fibrotic diseases in collaboration with Nitto Denko	Fibrotic conditions in the liver and other organs	Preliminary proof of concept was successfully performed by Nitto Denko. We are currently performing siRNA design and delivery studies.	Nitto Denko (Worldwide)

PF-655 Phase II for Diabetic Macular Edema and for Wet Age-Related Macular Degeneration. PF-655 has been studied in two Phase II clinical trials for the treatment of diabetic macular edema and for the treatment of wet age-related macular degeneration. PF-655 is a stabilized, synthetic, chemically modified siRNA that inhibits our proprietary target RTP801, a gene we believe plays a significant role in wet age-related macular degeneration and diabetic macular edema. Wet age-related macular degeneration is the leading cause of central vision loss in the elderly and occurs when the light sensing cells in the central portion of the retina, called the macula, malfunction and over time cease to work. Diabetic macular edema is the result of retinal microvascular changes that occur in patients with diabetes and is the major cause of visual impairment in diabetic patients. We have licensed PF-655 to Pfizer on an exclusive worldwide basis. We have successfully completed our Phase I clinical trial in wet age-related macular degeneration patients. No drug-related adverse events were observed. Approximately 80% of subjects showed stable or improved vision two weeks after a single injection of the siRNA. A subset of patients in this study, 18 of the total 27 patients enrolled, showed a mean improvement of 4 letters (about one line gain) on a visual acuity test at 28 days after a single injection of PF-655. While the study was designed to test for safety, and not to establish efficacy, these changes were presented as clinically meaningful at the ARVO conference in 2009 by a lead investigator of the study, Dr. Quan Nguyen from the Wilmer Ophthalmological Institute of the Johns Hopkins University School of Medicine.

We have received results in both Phase II trials. In the Phase II DEGAS trial for diabetic macular edema, the results demonstrated that the drug was well tolerated, with no observed drug related serious adverse events. 184 patients were randomly assigned to four treatment groups, with three dose levels of PF-04523655 (RTP801I-14) (0.4mg, 1mg, and 3mg) or laser. Following 12-months treatment with PF-655, a dose dependent improvement in visual acuity was observed with the best results achieved at the 3 mg level. At this dose, the mean improvement from baseline on a visual acuity test was 5.8 letters for all patients enrolled in this dose group while in patients treated with laser photocoagulation control (the current standard of care) visual acuity improved by only 2.4 letters on average (p=0.08). Furthermore, in a separate secondary analysis of the 111 patients who completed the 12 months follow-up visit, the mean improvement from baseline on a visual acuity test in the 3 mg group was 9.1 letters while in patients treated with laser photocoagulation control visual acuity improved by only 3.2 letters on average (p<0.01). Based on the results of this study, and the demonstration of dose related effect on vision, it was decided to conduct a further phase IIb study in order to test higher doses of PF-655 and to determine the optimal dose to be included in the pivotal phase III studies.

The Phase II trial of PF-655 in wet age-related macular degeneration continues to be conducted by Pfizer. Patient dosing is complete, and an interim review of data in November 2010 determined that PF-655 produced increasing improvements in mean visual acuity over the 3-month dosing period but at 4 months, the primary time point, PF-655 was not numerically superior to Lucentis for mean visual acuity at any of the doses used in the study. Overall, in the review of data up to 4 months no safety concerns were identified in continuing the study. The study is therefore continuing as planned. Full data is expected in the second half of 2011.

In March 2011, we amended our License Agreement with Pfizer. Under the amendment, Quark will conduct at its own expense a Phase IIb trial of PF-655 in diabetic macular edema at higher doses, under a protocol mutually agreed by Quark and Pfizer. A portion of the proceeds of this offering will be used to conduct this trial. We will deliver the trial data to Pfizer upon completion. After its review of the data, Pfizer will either make a milestone payment to us at that time in an amount which exceeds the anticipated cost of the trial and resume responsibility for continued development of PF-655 at Pfizer’s expense, or will terminate its license and return the rights to the product. In consideration of us conducting the Phase IIb trial, Pfizer agreed to increase the overall development and product approval milestone payments associated with the first ophthalmic use of PF-655 and to increase the royalty rates under the agreement.

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QPI-1002 for Acute Kidney Injury and Delayed Graft Function. We completed two Phase I trials for the prevention of acute kidney injury in patients undergoing major cardiac surgery and for prevention of delayed graft function in kidney transplant patients. In both trials, QPI-1002 was administered systemically via intravenous injection with no dose-limiting toxicities observed. Based on publicly available information, we believe that this was the first siRNA administered systemically in a human clinical trial. QPI-1002 is a synthetic, chemically modified siRNA molecule designed to temporarily inhibit the expression of p53, a gene we believe plays a significant role in ischemic injury related conditions in the kidney. Acute kidney injury is a syndrome characterized by a rapid decline of kidney function leading to death in a high percentage of cases. Major cardiovascular surgery is one of the many causes of acute kidney injury. Currently, there are no effective drug therapies to prevent acute kidney injury. Delayed graft function results most often from ischemia-reperfusion injury that can occur during the transplantation process and is particularly common in kidneys from deceased donors. Delayed graft function is associated with poorer long-term outcome for the kidney transplant patient, with increased incidence of acute rejection, increased hospital stays and increased consumption of peri-transplant resources. We have recently initiated dosing in a Phase II trial for delayed graft function and expect to initiate dosing in a Phase II clinical trial for AKI within the second half of 2011. In August 2010 we granted to Novartis an option for a worldwide exclusive license to QPI-1002 for all indications.

QPI-1007 for Non arteritic Anterior Ischemic Optic Neuropathy. QPI-1007 is being developed as a neuroprotective agent for the treatment of sudden vision loss associated with non-arteritic anterior ischemic optic neuropathy. We are conducting a Phase I trial to evaluate the safety and tolerability of QPI-1007 in patients suffering from of non-arteritic anterior ischemic optic neuropathy. QPI-1007 is a chemically modified siRNA and it is our first drug candidate based on novel siRNA structures developed internally by Quark. QPI-1007 is designed to inhibit the expression of the pro-apoptotic gene, caspase 2, via the RNAi pathway. Apoptosis (programmed cell death) is thought to be the main cause of the death of retinal ganglion cells in non-arteritic anterior ischemic optic neuropathy and glaucoma. In preclinical studies, QPI-1007 was effective in preserving retinal ganglion cell integrity in three different ocular disease models of retinal ganglion cell damage. If QPI 1007 is determined to be safe and effective in non-arteritic anterior ischemic optic neuropathy we may develop QPI-1007 also for glaucoma and/or other ocular disease in need for neuroprotective treatment. We expect to complete dosing and have preliminary results in our Phase I clinical trial in the second half of 2011. In addition to safety data, we have designed the study to identify a potential trend in biological activity compared to historical data. Depending on the results and subject to our future financial position, we may initiate Phase II trials in a glaucoma condition, in non-arteritic anterior ischemic optic neuropathy, in both indications or none of them.

Pipeline Programs: We have three broad programs that aim to design and develop siRNA molecules based on our internally developed siRNA structures to treat diseases that are unmet medical needs. Most of the programs are in proof of concept studies in animal models, a subset of these is in lead candidate optimization stage, some are at the stage of delivery studies in vivo. We expect to file at least one IND application in 2012 based on research in these programs. We also expect to file an IND application in the research program we perform in collaboration with Nitto Denko. Our major internal research and development programs comprise:

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Neuroprotection and neural regeneration program. We include in this category our pipeline programs in diseases of the central nervous system, and diseases of the eyes and ear, in particular those diseases where nerve cell or neuron protection and /or regeneration of the long fibers of a nerve cell, or axons, carrying outgoing sensory and motor messages, is important. Also, in many cases neuronal injury is associated with allodynia, or neuropathic pain. We have demonstrated siRNA delivery to the neurons in several disease conditions listed below and we are developing a novel non-invasive delivery to the back of the eye, inner ear and brain. Our primary siRNA drug candidate for neuroregeneration and neuropatic pain is a siRNA designed to inhibit expression of a gene called RhoA with which we have shown proof of concept for both end points in spinal cord injury. We are now optimizing RhoA siRNA with the purpose of generating the lead siRNA for formal preclinical development. In line with our strategy of developing a drug candidate in several diseases based on common pathological mechanism, we are testing RhoA siRNA, together with

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siRNAs targeting other genes, in animal models for spinal cord injury, optic nerve regeneration, neuropathic pain, hearing loss and vestibular diseases such as Meneiere’s disease, and other central nervous system diseases based on invasive and non invasive delivery to the back of the eye, inner ear and brain.

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Respiratory and inflammatory diseases program. Based on siRNA delivery by inhalation we have shown proof of concept for our dual siRNA drug candidate for prevention of primary graft dysfunction an animal model of lung transplantation. This drug cocktail may be useful for treatment of acute lung injury in conditions other than lung transplantation since the pathological mechanism of response to ischemic injury is essentially unchanged in diverse disorders.

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Treatment of chronic diseases by systemic administration. This category includes our development for treatment of chronic kidney disease and cancer indications. We are currently performing delivery optimization studies.

Fibrotic diseases in collaboration with Nitto Denko. No effective treatments are available for most of the serious fibrotic diseases and our objective is to develop potential therapies within our fully-funded collaboration with Nitto Denko. The collaboration aims to develop one or more new siRNA drugs that may offer an effective treatment for fibrotic diseases. The collaboration utilizes Quark’s technology and intellectual property in RNAi, potentially combined with Nitto Denko’s delivery technology to identify, select, optimize and develop a new siRNA drug based on a therapeutic concept and target gene identified by Nitto Denko and its collaborating scientists. While the initial disease indication for development is yet to be determined by joint teams of Quark and Nitto Denko, potential diseases include liver fibrosis, lung fibrosis, bone marrow fibrosis and kidney fibrosis, all major unmet medical needs. Quark successfully performed a feasibility study funded by Nitto Denko confirming the validity of the concept of treating fibrotic disease with an siRNA drug inhibiting the Nitto Denko target gene. The collaboration was initiated in July 2010 and several potential drug candidates were generated and are being tested. We expect to file a first IND application in 2012.

siRNA Technology Development

We have an ongoing program that aims to develop new siRNA-related technologies and to improve our current technology platform and our intellectual property position in the RNAi space. This program has two arms:

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Development of novel siRNA structures that are free from third party IP. We have developed a number of novel structures and filed six patent applications to date. Based on our understanding of the siRNA mechanism, this program uses our siRNA expertise to identify critical positions and chemical modification patterns to enhance activity, reduce unwanted or off-target effects, minimize unwanted immune response effects and increase the stability of our siRNA drug candidates.

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Development of proprietary drug delivery methods. This program includes novel non- invasive delivery of siRNA to the inner ear, brain, back of the eye and novel methods of delivery to tumor cells.

Israeli National siRNA Project Consortium

The Israeli Chief Scientist and the head of the research and development national projects approved the establishment of a consortium headed by the wholly owned subsidiary of Quark, QBI Enterprises Ltd (QBI), together with several leading members of the industry and prominent scientists in academia in Israel, to develop novel generic technologies in the field of RNAi. We believe that the approval of a national project for siRNA is recognition of the government of Israel to financially support a project of national importance that can potentially create jobs and generate revenues for the State of Israel.

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Our License Agreement with Pfizer

In September 2006, we granted Pfizer an exclusive worldwide license to develop and commercialize drug candidates that inhibit our proprietary target gene RTP801 through RNAi for both ophthalmic and non-ophthalmic indications. Under the agreement, Pfizer is responsible for all future preclinical and clinical development costs of the licensed drug candidates, as well as all regulatory filings and approvals with the exception of the Phase IIb trial in diabetic macular edema described in this paragraph. In March 2011, we amended our License Agreement with Pfizer to cause Quark to conduct at its own expense a Phase IIb trial of PF-655 in diabetic macular edema, under a protocol mutually agreed by Quark and Pfizer. We will deliver the data to Pfizer upon completion. After its review of the data, Pfizer will either make a milestone payment to us at that time in an amount which exceeds the anticipated cost of the trial and resume responsibility for continued development of PF-655 at Pfizer’s expense, or will terminate its license and return to us the rights to the product. In consideration of us conducting the Phase IIb trial, Pfizer agreed to increase the overall development and product approval milestone payments associated with the first ophthalmic use of PF-655 and to increase the royalty rates under the agreement. We can terminate the Phase IIb trial if an independent monitoring committee determines the study to be futile, based on data at an interim point provided in the protocol. Pfizer continues performing the Phase II clinical trial in wet age-related macular degeneration in collaboration with us. Israel has been a major source of patients in the Phase II studies. Through December 31, 2010, Pfizer had paid us an aggregate of approximately $52.5 million in up-front fees, cost reimbursements and milestone payments. The agreement as amended provides for up to $384 million in development and product approval milestone payments, assuming the development and approval in all major markets of a product for two ophthalmic indications and at least one non-ophthalmic indication. Pfizer is required to pay us royalties on any sales of licensed products and up to an additional $309 million of sales-based milestone payments.

Our Option Agreement with Novartis

In August 2010, we granted Novartis an option for an exclusive worldwide license to develop and commercialize QPI-1002 and any other p53-directed siRNAs controlled by us for any indication. Under the agreement, Novartis paid us a non-refundable option grant fee of $10 million and has the right to exercise the option during the Phase II trials of QPI-1002. This right will expire on different dates depending on whether interim and/or final results of these trials meet pre-defined criteria. If Novartis exercises the option, Novartis will be responsible for further development following the current Phase II trials and Quark will be entitled to option exercise fees and development, product approval, and sales-based milestone payments of up to $670 million as well as to royalties on sales.

Corporate Information

We were incorporated in California in December 1993 under the name Expression Systems, Inc. In April 1997, we changed our name to Quark Biotech, Inc. In June 2007, we changed our name to Quark Pharmaceuticals, Inc. Our principal executive offices are located at 6501 Dumbarton Circle, Fremont, California, 94555, and our telephone number is (510) 402-4020. Our website address is www.quarkpharma.com. The information contained on our website is not incorporated into and does not constitute a part of this prospectus, and the only information that you should rely on in making your decision whether to invest in our common stock is the information contained in this prospectus and any free writing prospectus. As used in this prospectus, references to “Quark,” “our,” “us” and “we” refer collectively to Quark Pharmaceuticals, Inc. and all of its subsidiaries unless the context requires otherwise.

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THE OFFERING

Securities offered by us

37,500 units (the mid point of the range of the units offered, as stated on the cover page of this prospectus), with each unit consisting of 100 shares of common stock and 50 warrants, with each warrant exercisable into one share of common stock

Upon the closing of the offering, the shares of our common stock and the warrants comprising the units will be issued and will trade separately on the TASE

Common stock to be outstanding after this offering

25,134,630 shares, assuming an offering of 37,500 units (or shares, if the additional allotment, if any, is purchased in full)

Warrants to be outstanding after this offering

1,875,000 warrants, assuming an offering of 37,500 units, excluding 187,500 warrants to be issued to the distributors in this offering as part of their commission (or warrants, if the additional allotment, if any, is purchased in full)

Terms of Warrants issued as part of the offering

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Exercise price of $, which is equal to 125% of the offering price of one share of common stock and one-half of a warrant comprising a unit being offered hereby. The Warrants may not be exercised by means of a cashless exercise.

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Exercisability — each warrant is exercisable for one share of common stock.

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Exercise period — each warrant will be immediately exercisable upon issuance and will expire two years from the date of issuance.

Use of proceeds

To conduct a Phase IIb clinical trial of PF-655, two Phase II clinical trials of our current product candidates QPI-1002, a Phase I clinical trial of QPI-1007 and continuation of the development of our product candidates in preclinical development, all subject to the receipt of necessary regulatory approvals and achievement of other milestones. If our financial resources permit, we would also seek to conduct a Phase II clinical trial of our product candidate QPI-1007 in non-arteritic anterior ischemic neuropathy and/or glaucoma. However, these clinical trials would be secondary to the completion of the trials described above as to which we have contractual commitments.

Proposed Tel Aviv Stock Exchange symbol

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The number of shares of common stock that will be outstanding immediately after this offering is based on 25,134,630 shares of common stock outstanding as of February 28, 2011 and excludes:

•

2,610,274 shares of common stock issuable upon the exercise of outstanding options with a weighted average exercise price of $1.90 per share;

•

796,289 shares of common stock reserved for future issuance under our 1997 Stock Plan and 2007 Equity Incentive Plan;

•

500,000 shares of common stock reserved for future issuance under our 2010 Employee Stock Purchase Plan.

•

1,875,000 warrants, with each warrant exercisable for one share of common stock, upon issuance of 37,500 units in this offering;

•

an additional allotment of units, if any; and

•

187,500 warrants to be issued to the distributors in this offering as part of their commission, with each warrant exercisable for one share of common stock.

Except as otherwise indicated, all information in this prospectus assumes the conversion of all our outstanding shares of preferred stock into 17,996,100 shares of common stock prior to the completion of this offering.

Currently, there is no public market for our common stock in the United States or anywhere else in the world and no assurances can be given that a public market will develop the United States or, if developed, that it will be sustained. We have applied to have our common stock is listed on the TASE. The shares of our common stock and Warrants which are being offered under this prospectus are expected to be listed for trading on TASE promptly after the registration statement filed with the SEC of which this prospectus is a part is declared effective.

Concurrently with the effectiveness of the registration statement of which this prospectus forms a part, we are publishing a Supplemental Notice to an Incomplete Prospectus published by us in Israel which is intended for non-U.S. investors based in Israel. Such investors should refer to the Incomplete Prospectus and the Supplemental Notice, which together form the Israeli prospectus that we filed with the Israel Securities Authority, or ISA, and which will be available at http://www.magna.isa.gov.il.

The Auction Process

We plan to conduct this offering using an auction process for all investors, both individual and institutional. To participate in the auction, investors will submit bids to purchase units that specify the number of units the investor would be interested in purchasing and the price the investor would be willing to pay. Bids must be submitted to TASE members. We intend to use the auction to determine the offering price per unit for the offering. All valid bids to purchase units at or above the determined offering price per unit will receive an allocation of units at the offering price. If the number of units represented by successful bids exceeds the number of units we are offering, then all bidders making bids above the offering price per unit will receive all the units for which they bid, all bidders making bids at the offering price per unit will receive some of the units for which they bid, on a pro-rata basis, and all bidders making bids below the offering price per unit will receive no units. During the period in which the TASE members collect bids by potential investors, potential investors can withdraw or amend their bids. However, immediately at the conclusion of the auction period, which will occur on the day of the auction at a time to be published in a supplemental notice and either a free writing prospectus or an amendment to the registration statement of which this prospectus is a part, TASE members will stop accepting any amendments to placed bids or withdrawals thereof. At this point, the bids will become irrevocable. We will publish a press release announcing the commencement of the bidding process a few hours prior to the commencement including a detailed timetable of the auction day. See the section entitled Plan of Distribution for a description of how this process will work.

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SUMMARY FINANCIAL DATA

The following summary financial data should be read together with our audited financial statements and accompanying notes and “Management’s Discussion and Analysis of Financial Condition and Results of Operations” appearing elsewhere in this prospectus. Our historical results are not necessarily indicative of our future results.


	Years Ended December 31,
	Audited
	2008			2009			2010
	(in thousands, except share and per share data)
Statements of Operations Data:
Revenues	$	17,276		$	2,655		$	5,201
Cost of development services		1,719			1,712			1,200
Gross profit		15,557			943			4,001
Operating costs and expenses:
Research and development		18,726			15,744			18,682
General and administrative		5,018			5,087			6,340
Total operating costs and expenses		23,744			20,831			25,022
Operating income (loss)		(8,187	)		(19,888	)		(21,021	)
Financial income (expenses), net		722			87			(538	)
Income (loss) before income taxes		(7,465	)		(19,801	)		(21,559	)
Income taxes		(1,677	)		160			(283	)
Net income (loss)		(9,132	)		(19,641	)		(21,842	)
Changes of redemption value of Series F and H Preferred Stock		—			—			(468	)
Deemed dividend as a result of warrants modification		—			—			—
Income attributable to preferred shareholders		—			—			—
Net loss to common Stockholders	$	(9,132	)	$	(19,641	)	$	(22,310	)
Net loss per share of common stock: Basic and diluted income (loss) per share	$	(2.76	)	$	(5.80	)	$	(6.58	)
Weighted average number of shares used in computing basic and diluted net loss per share:		3,307,871			3,388,119			3,388,530
Proforma net loss per share of common stock:
Basic and diluted net loss per share pro forma (unaudited)								(1.07	)
Weighted average number of shares used in computing basic net loss per share pro forma (unaudited):								20,394,767

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	As of December 31, 2010
	Actual			As adjusted⁽¹⁾
	(in thousands)
Balance Sheet Data:
Cash and cash equivalents	$	13,887		$	48,182
Working capital		5,856			39,794
Total assets		17,571			50,801
Deferred revenues		9,920			9,920
Redeemable convertible preferred stock		38,500			—
Total stockholders’ equity (deficiency)		(37,383	)		35,055

(1)

The as adjusted balance sheet data reflects (i) the conversion of all our outstanding shares of preferred stock into shares of common stock prior to the completion of this offering, and (ii) the sale of 37,500 units (the mid point of the range of the units offered, as stated on the cover page of this prospectus) in this offering at an assumed initial public offering price of $10.00 per share and a corresponding one-half of a warrant which is the midpoint of the estimated price range, as set forth on the cover page of this prospectus, after deducting distribution commissions and estimated offering expenses.

(2)

Each $1.00 increase (decrease) in the assumed initial public offering price of $10.00 per share and a corresponding one-half of a warrant which is the midpoint of the estimated price range, as set forth on the cover page of this prospectus, would increase (decrease) each of cash and cash equivalents, working capital, total assets and total shareholders’ equity by approximately $3.50 million, assuming that the number of units offered by us, as set forth on the cover page of this prospectus, remains the same, and after deducting commissions and estimated offering expenses payable by us. We may also increase or decrease the number of units we are offering. Each increase (decrease) of one thousand units (or 100,000 shares of common stock and a corresponding 50,000 Warrants) in the number of units offered by us would increase (decrease) each of cash and cash equivalents, working capital, total assets and total shareholders’ equity by approximately $0.94 million, assuming that the assumed initial public offering price remains the same, and after deducting the estimated discounts and commissions and offering expenses payable by us. The proforma as adjusted information discussed above is illustrative only and will be adjusted based on the actual initial public offering price and other terms of this offering determined at pricing.

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RISK FACTORS

An investment in our common stock involves a high degree of risk. You should carefully consider the following risks, as well as all of the other information contained in this prospectus, before investing in our common stock. If any of the following possible events actually occur, our business, business prospects, cash flow, results of operations or financial condition could be harmed. In this case, the trading price of our common stock could decline, and you might lose all or part of your investment in our common stock. In assessing these risks, you should also refer to the other information contained in this prospectus, including our financial statements and related notes. Additional risks and uncertainties not presently known to us or that we currently deem immaterial may also impair our operations.

Our success is dependent on the success of our lead product candidates, PF-655, QPI-1002 and QPI-1007, and we cannot be certain that they will achieve success in clinical trials, that they will receive regulatory approval or be successfully commercialized.

We have three drug candidates in clinical studies in five disease indications. PF-655, is currently being evaluated in a Phase II clinical trial for the treatment of wet age-related macular degeneration and a Phase IIb clinical trial for the treatment of diabetic macular edema will be initiated in the first half of 2011, QPI-1002 is being evaluated in a Phase II clinical trial for the prevention of delayed graft function in kidney transplant patients and enrollment in a Phase II study in cardiovascular surgery patients for the prevention of acute kidney injury will be initiated in 2011, and QPI-1007 is being evaluated in a Phase I clinical study for the treatment of non-arteritic anterior ischemic retinopathy. These drug candidates will require the successful completion of these and other planned Phase II and Phase III clinical trials before we are able to submit a New Drug Application, or NDA, to the U.S. Food and Drug Administration, or FDA, for approval. This process can take many years and require the expenditure of substantial resources. In September 2006, we licensed PF-655 to Pfizer on an exclusive worldwide basis. As a result, except for the Phase IIb trial in diabetic macular edema, we will not control the development of PF-655. Clinical trials required for FDA approval of PF-655, QPI-1002 and QPI-1007 may not be successfully completed. If these clinical trials fail to demonstrate that PF-655, QPI-1002 and QPI-1007 are safe and effective, these drug candidates will not receive approval for marketing. Even if PF-655, QPI-1002 and QPI-1007 receive regulatory approval for marketing, they may never be successfully commercialized. If PF-655, QPI-1002 and QPI-1007 do not receive regulatory approval or are not successfully commercialized, we may not be able to generate revenue, become profitable or continue our operations.

Other than PF-655, QPI-1002 and QPI-1007, all of our other programs are in preclinical studies or early stage research. If we are unable to develop and commercialize our early stage product candidates, our business will be adversely affected.

In addition to our PF-655, QPI-1002 and QPI-2007 drug candidates, a key element of our strategy is to discover, develop and commercialize a portfolio of new products. We are seeking to do so through our internal research programs and intend to explore strategic collaborations for the development of new products. Whether or not any product candidates are ultimately identified, research programs to identify new disease targets and product candidates require substantial technical, financial and human resources. Our research programs may initially show promise in identifying potential product candidates, yet fail to yield a successful commercial product for many reasons, including the following:

•

competitors may develop alternatives that render our product candidates obsolete;

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a product candidate may not have a sustainable intellectual property position in major markets;

•

a product candidate may, after additional studies, be shown to have harmful side effects or other characteristics that indicate it is unlikely to be effective;

•

a product candidate may not receive regulatory approval;

•

a product candidate may not be capable of production in commercial quantities at an acceptable cost, or at all; or

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•

a product candidate may not be accepted by patients, the medical community or third-party payors.

There is a limited amount of information upon which you can evaluate our business and prospects.

We have limited experience in drug development and have not yet demonstrated an ability to successfully overcome many of the risks and uncertainties frequently encountered by companies in new and rapidly evolving fields, particularly in the biopharmaceutical area. For example, to execute our business plan, we will need to successfully:

•

execute product development activities;

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build and maintain a strong intellectual property portfolio;

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obtain regulatory approvals;

•

gain market acceptance for our products, if approved;

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develop and maintain successful strategic relationships;

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develop sales and marketing capabilities or collaborate with others for these functions; and

•

manage our spending as costs and expenses increase due to clinical trials and in anticipation of regulatory approvals and commercialization.

If we are unsuccessful in accomplishing these objectives, we may not be able to develop product candidates, raise capital, expand our business or continue our operations.

We have a history of losses and may never be profitable.

We have experienced significant operating losses since our inception. As of December 31, 2010 we had accumulated net losses of approximately $115 million. To date, we have neither developed any products nor generated any revenues from the sale of products. Further, we do not expect to generate any such revenues in the foreseeable future. We expect to continue to incur annual net operating losses for at least the next several years as we expand our efforts to discover, develop and commercialize novel therapeutics. We anticipate that the majority of any revenue we generate over the next several years will continue to be from collaborations with pharmaceutical companies, but we cannot be certain that we will be able to secure or maintain these collaborations, or meet the obligations associated with these collaborations, or achieve any milestones that we may be required to meet to receive payments.

To become and remain profitable, we must succeed in developing and commercializing novel drugs that achieve market acceptance. This will require us and our licensees and collaborators to be successful in a range of challenging activities, including the preclinical testing and clinical trial stages of development and obtaining regulatory approval, and manufacturing, marketing and selling these product candidates. These activities may not be successful, and we may never generate revenues that are significant enough to achieve profitability. Even if we do achieve profitability, we may not be able to sustain or increase profitability on a quarterly or annual basis. If we cannot become and remain profitable, the market price of our common stock could decline. In addition, we may be unable to raise capital, expand our business, diversify our product pipeline or continue our operations.

We will require substantial additional funds to continue our research and development activities. If additional funds are not available we may need to significantly scale back or cease our operations.

We have used substantial funds to develop our technologies and will require substantial funds to conduct further research and development, including preclinical testing and clinical trials of any product candidates, and to manufacture and market any products that are approved for commercial sale. Because the successful development of our product candidates is uncertain, we are unable to estimate the actual funds we will require to develop and commercialize them. We anticipate that our current resources, as supplemented by proceeds from this offering and expected research and development funding and milestone payments from our collaborators, will sustain our business through the first half of 2013. We expect our research and development expenses for this period to be between $47.8 million and $60.2 million.

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Our future capital requirements and the period for which we expect our existing resources to support our operations may vary from what we expect. We have based our expectations on a number of factors, many of which are difficult to predict or are outside of our control, including:

•

our progress in demonstrating that siRNAs can be used as drugs;

•

progress in our research and development programs, as well as the magnitude of the spending to support these programs;

•

the timing, receipt and amount of milestone and other payments, if any, from present and future collaborators;

•

our ability to establish and maintain additional collaborative arrangements;

•

the resources, time and costs required to initiate and complete our preclinical testing and clinical trials, obtain regulatory approvals, protect our intellectual property and obtain and maintain licenses to third-party intellectual property; and

•

the timing, receipt and amount of sales and royalties, if any, from our potential products.

If our estimates and predictions relating to these factors are incorrect, we may need to modify our operating plan.

We will be required to seek additional funding in the future and intend to do so through either collaborative arrangements, public or private equity offerings or debt financings, or a combination of one or more of these funding sources. Additional funds may not be available to us on acceptable terms or at all. In addition, the terms of any financing may adversely affect the holdings or the rights of our shareholders. For example, if we raise additional funds by issuing equity securities, our shareholders will experience further dilution. Debt financing, if available, may involve restrictive covenants that could limit our flexibility in conducting future business activities. If we are unable to obtain funding on a timely basis, we may be required to significantly curtail one or more of our research or development programs. For example, depending on how our clinical trials progress and whether we need to enroll additional patients, we may not be able to complete our Phase IIb clinical trial for diabetic macular edema, our Phase II clinical trials of QPI-1002 in delayed graft function or acute kidney injury and/or our Phase I clinical trial for non arteritic anterior ischemic optic neuropathy unless we obtain additional funding. In addition, since we agreed under a March 2011 amendment to our agreement with Pfizer to conduct, at our expense, a Phase IIb clinical trial of PF-655 in diabetic macular edema, we will not receive financial support from Pfizer for conducting this trial. We also could be required to seek funds through arrangements with collaborators or others that may require us to relinquish rights to some of our technologies, product candidates or products that we would otherwise pursue on our own.

We expect to rely on revenues from our licensees and collaborators as an important source of revenue. If our relationships with Pfizer, Nitto Denko, Novartis or any future licensees and collaborators are unsuccessful, a collaborator terminates a collaboration or there is competition between us and a collaborator for the development of drugs targeting the same diseases, our business could be adversely affected.

In September 2006, we entered into a license agreement with Pfizer under which we licensed to Pfizer the exclusive worldwide rights to develop and commercialize our RNAi technology based molecules derived from and inhibiting our proprietary target gene RTP-801 for both ophthalmic indications and non-ophthalmic indications. We had acquired some of these rights from Silence Therapeutics, or Silence, formerly known as Atugen AG, under a December 2004 collaboration agreement. We expect that a substantial amount of the funding for our operations could come from our license agreements with Pfizer and Nitto Denko, our option and license agreements with Novartis and other similar agreements we may enter into in the future, through expense reimbursement, milestone payments and, if a product candidate is successfully commercialized, royalties. Substantially all of our revenues for 2007, 2008 and 2009 were attributable to our Pfizer agreement.

Under the Silence agreement, Silence may terminate our license if we fail to achieve development milestones, but these milestones are considered to be satisfied as long as the Pfizer agreement remains in effect. Pfizer may terminate the agreement without cause at any time upon prior written notice. If not

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terminated, the agreement will remain in effect in each country at least until the expiration of all relevant patents or ten years from the first commercial sale of the licensed product. Pfizer may at any time and for any reason discontinue the development of or regulatory approval process for the drug candidates it licensed from us, and instead elect to commercialize its own proprietary drug candidates or those of other licensors. Under the March 2011 amendment to our agreement with Pfizer, we agreed to conduct, at our sole expense, a Phase IIb clinical trial of PF-655 in diabetic macular edema. Upon the conclusion of this trial, we will provide the results to Pfizer. Following its evaluation of the data, Pfizer must either make a milestone payment to us and resume its responsibility to continue development of PF-655 or terminate its license with us. While Pfizer can terminate its agreement with us at any time and for any or no reason, if Pfizer considers the results of our planned Phase IIb study of PF-655 in diabetic macular edema unsuccessful, it is likely that Pfizer would elect to terminate its agreement with us to avoid incurring the expense of the milestone payment and additional development expenses that become payable. Additionally, if Pfizer terminates its agreement with us, we would be required under the Silence agreement to achieve a pre-agreed development milestone within a defined time period following the termination. Pfizer has significantly greater financial resources than we do and has far more experience in developing and marketing drugs, which could put us at a competitive disadvantage if we were to compete with Pfizer in the development of RNAi-based drugs targeting the same disease. If required to develop drug candidates that target RTP-801, we may not be able to do so successfully, do so as efficiently as Pfizer or at all. If we are unable to meet the remaining development milestones as specified in our RTP-801 development plan, we may lose our rights to one or more of the Silence patents. Although our agreement with Pfizer grants us the option to take an exclusive license to Pfizer intellectual property relating to RTP-801, if any, this license would then impose an additional cost that may not be commercially feasible. In addition, this option does not extend to (i) Pfizer’s intellectual property licensed from third parties under agreements that prohibit transferring rights to another party such as us, and (ii) certain devices Pfizer may have used in conjunction with developing RTP-801.

In the future, we hope to enter into similar license or collaboration agreements with pharmaceutical companies for the development of product candidates we may identify. If our relationship with Pfizer or any future collaborations are unsuccessful or terminated early, our business would be adversely affected.

We are also at risk that these collaborations or other arrangements may not be successful. Factors that may affect the success of our collaborations include the following:

•

Our collaborators may incur financial and cash-flow difficulties that force them to limit or reduce their participation in our joint projects;

•

Our collaborators may be pursuing alternative technologies or developing alternative products that are competitive to our product, either on their own or with others;

•

Our collaborators may terminate their relationships with us. This could make it difficult for us to attract new collaborators or adversely affect perception of us in the business and financial communities; Our collaborators may pursue higher priority programs or change the focus of their development programs, which could affect their commitment to us. Pharmaceutical and biotechnology companies historically have re-evaluated their priorities from time to time, including following mergers and consolidations, a common occurrence in recent years; and

•

Our collaborators may become the target of litigation for purported patent or intellectual property infringement, which could delay or prohibit commercialization of our products and which would reduce our revenue from such products.

Because we have licensed some of our drug candidates to third parties, we are more dependent on third parties for the successful development and commercialization of those drug candidates.

Our decision to license some of our drug candidates to third parties means we have relinquished control over how those drug candidates are developed and commercialized and how they are perceived in the marketplace. As a result, our success is dependent, in part, on the efforts of those licensees. In addition, our drug candidates may receive negative publicity relating to the activities of our licensees, regardless of whether such publicity is properly attributable to the merits of our drug candidates. If we receive negative publicity

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based on the activities of our licensees, our business, financial condition and results of operations and the value of our common stock could be materially and adversely affected.

We may not be able to execute our business strategy if we are unable to enter into or maintain license or collaboration agreements with other companies that can provide capabilities and funds for the development and commercialization of our drug candidates. If we are unsuccessful in forming or maintaining these relationships, our business may be adversely affected.

We do not have any manufacturing, sales, marketing or distribution capabilities and have limited drug development capabilities. Accordingly, we have and plan to continue to enter into agreements with other companies that can provide such capabilities. For example, we may enter into agreements with major pharmaceutical companies to jointly develop specific drug candidates and to jointly commercialize them if they are approved. In such agreements, we would expect our pharmaceutical collaborators to provide substantial capabilities in clinical development, regulatory affairs, marketing and sales. We may not be successful in entering into any such agreements on favorable terms. Even if we do succeed in securing such agreements, we may not be able to maintain them if, for example, development or approval of a drug candidate is delayed or sales of an approved drug are disappointing. Furthermore, any delay in entering into these agreements could delay the development and commercialization of our drug candidates and reduce their competitiveness even if they reach the market. Any such delay could adversely affect our business.

We have granted licenses or options to license and agreed to collaborate with third parties to fund all or part of the costs of drug development and commercialization, such as our collaboration with Pfizer, as well as collaborations with Mitsubishi Pharma Corporation, Sankyo Co., Ltd., Astellas Pharma Inc., AstraZeneca, Taisho Pharmaceutical Co., Ltd. and Shionogi & Co and Nitto Denko Corp. Except for our collaboration with Pfizer and Nitto Denko, the research funding under each of these agreements has ended. While we may at some point receive payments from certain of these collaboration partners upon the achievement of development milestones by these partners, except for our collaboration with Pfizer and Nitto Denko, none of the agreements are expected to be material to our business in the future. We may not, however, be able to enter into additional collaborations, and the terms of any collaboration agreement we do secure may not be favorable to us. If we are not successful in our efforts to enter into future collaboration arrangements, we may not have sufficient funds to develop drug candidates internally, or to bring any drug candidates to market, which would substantially harm our business.

RNAi-based drug development is unproven and may never lead to marketable products.

Our future success depends on the successful development of products based on RNAi technology. Neither we nor any other company has received regulatory approval to market therapeutics utilizing siRNAs. The scientific discoveries that form the basis for our efforts to discover and develop new siRNA drugs are relatively new. The scientific evidence to support the feasibility of developing drugs based on these discoveries is both preliminary and limited. Skepticism as to the feasibility of developing RNAi therapeutics has been expressed in scientific literature.

Very few drug candidates based on these discoveries have ever been tested in animals or humans. Currently, no drugs based on RNAi technology have been approved or have progressed beyond Phase III clinical trials. We currently have only limited data suggesting that we can introduce into siRNAs the properties typically required of drugs, such as the ability to be stable in the body long enough to reach the tissues in which their effects are required, or the ability to enter cells within these tissues in order to exert their effects. We may make significant expenditures trying to optimize these properties without success. In addition, these compounds may not demonstrate in patients the chemical and pharmacological properties ascribed to them in laboratory studies, and they may interact with human biological systems in unforeseen, ineffective or harmful ways. As a result, we may never succeed in developing a marketable product. If we do not successfully develop and commercialize drugs based upon our siRNA drug candidates, we may not become profitable and the value of our common stock will decline.

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Any failure or delay in completing clinical trials for our product candidates could severely harm our business.

Each of our product candidates must undergo extensive preclinical studies and clinical trials as a condition to regulatory approval. Preclinical studies and clinical trials are expensive and take many years to complete. We estimate that clinical trials and related regulatory review in initial indications for our most advanced product candidates, PF-655, QPI-1002 and QPI-1007, will continue for at least several more years, but could take significantly longer to complete. The completion of clinical trials for our product candidates may be delayed or halted for many reasons, including:

•

delays or failure in reaching agreement on acceptable clinical trial contracts or clinical trial protocols with prospective sites;

•

regulators or institutional review boards may not authorize us to commence a clinical trial;

•

our inability, or the inability of our collaborators or licensees, to manufacture or obtain from third parties materials sufficient to complete our preclinical studies and clinical trials;

•

delays in patient enrollment, and variability in the number and types of patients available for clinical trials;

•

risks associated with trial designs;

•

difficulty in maintaining contact with patients after treatment, resulting in incomplete data;

•

poor effectiveness of product candidates during clinical trials;

•

safety issues, including serious adverse events;

•

the failure of patients to complete clinical trials due to side effects, dissatisfaction with the product candidate or other reasons;

•

governmental or regulatory delays and changes in regulatory requirements, policy and guidelines; and

•

varying interpretation of data by the FDA and similar foreign regulatory agencies.

Clinical trials may require the enrollment of large numbers of patients, and suitable patients may be difficult to identify and recruit. Our ability to enroll sufficient numbers of patients in our clinical trials depends on many factors, including the size of the patient population, the nature of the protocol, the proximity of patients to clinical sites, the eligibility criteria for the trial and competition for patients from other clinical trials. Patients participating in the trials may not live through completion of the trial or may suffer adverse medical effects unrelated to treatment with our product candidate. The results from preclinical testing and prior clinical trials may not be predictive of results obtained in later and larger clinical trials. A number of companies in the pharmaceutical industry have suffered significant setbacks in clinical trials, even in advanced clinical trials after showing promising results in earlier clinical trials. Our failure to adequately demonstrate the safety and effectiveness of any of our product candidates will prevent us from receiving regulatory approval and negatively impact our business.

It is possible that none of our product candidates will complete clinical trials in any of the markets in which we intend to sell those product candidates. We also do not know and are unable to predict what clinical trials the FDA will require us to conduct, which could result in additional delays in bringing our product candidates to market. Accordingly, we may not receive the regulatory approvals needed to market our product candidates. Any failure or delay in completing clinical trials for our product candidates would delay commercialization of our product candidates and severely harm our business and financial condition.

We may be unable to obtain U.S. or foreign regulatory approval and, as a result, be unable to commercialize our drug candidates.

Our drug candidates are subject to extensive governmental regulations relating to development, clinical trials, manufacturing and commercialization. Rigorous preclinical testing and clinical trials and an extensive regulatory approval process are required to be successfully completed in the United States and in many

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foreign jurisdictions before a new drug can be sold. Satisfaction of these and other regulatory requirements is costly, time consuming, uncertain and subject to unanticipated delays. It is possible that none of the drug candidates we may develop will obtain the regulatory approvals necessary for us or our licensees or collaborators to begin selling them.

We have little experience in conducting and managing the clinical trials necessary to obtain regulatory approvals, including approval by the FDA. The time required to obtain FDA and other approvals is unpredictable. Any analysis we perform of data from preclinical and clinical activities is subject to confirmation and interpretation by regulatory authorities, which could delay, limit or prevent regulatory approval. We may also encounter unexpected delays or increased costs due to new government regulations, for example, from future legislation or administrative action, or from changes in FDA policy during the period of product development, clinical trials and FDA regulatory review.

Because the drugs we are intending to develop may represent a new class of drug, the FDA has not yet established any definitive policies, practices or guidelines in relation to these drugs. While we expect any product candidates that we develop will be regulated as a new drug under the Federal Food, Drug, and Cosmetic Act, the FDA could decide to regulate them or other products we may develop as biologics under the Public Health Service Act. If the FDA decides to regulate our product candidates as biologists, oversight for such candidates would shift from the FDA’s Center for Drug Evaluation and Research (CDER) to its Center for Biologics Evaluation and Research (CBER), and we would apply for marketing via a Biologics Licensing Application (BLA) rather than an New Drug Application (NDA). Either pathway relies on sound scientific evaluation of product safety and efficacy for determining approvals, and would not significantly change our development approach. The lack of policies, practices or guidelines may hinder or slow review by the FDA of any regulatory filings that we may submit. Moreover, the FDA may respond to these submissions by defining requirements we may not have anticipated. Such responses could lead to significant delays in the clinical development of our product candidates. In addition, because there may be approved treatments for some of the diseases for which we may seek approval, in order to receive regulatory approval, we will need to demonstrate through clinical trials that the product candidates we develop to treat these diseases, if any, are not only safe and effective, but safer or more effective than existing products.

Any delay or failure in obtaining required approvals could have a material adverse effect on our ability to generate revenues from the particular drug candidate. Furthermore, any regulatory approval to market a product may be subject to limitations on the indicated uses for which we may market the product. These limitations may limit the size of the market for the product.

We are also subject to numerous foreign regulatory requirements governing the conduct of clinical trials, manufacturing and marketing authorization, pricing and third-party reimbursement. The foreign regulatory approval process includes all of the risks associated with FDA approval described above as well as risks attributable to the satisfaction of local regulations in foreign jurisdictions. Approval by the FDA does not assure approval by regulatory authorities outside the United States.

Even if we obtain regulatory approvals, our marketed drugs will be subject to ongoing regulatory review. If we fail to comply with continuing U.S. and foreign regulations, we could lose our approvals to market drugs and our business would be seriously harmed.

Following any initial regulatory approval of any drugs we may develop, we will also be subject to continuing regulatory review, including the review of adverse drug events and clinical results that are reported after our drugs are made commercially available. This would include results from any post-marketing tests or vigilance required as a condition of approval. The manufacturer and manufacturing facilities we use to make any of our drug candidates will also be subject to periodic review and inspection by the FDA. The discovery of any previously unknown problems with the product, manufacturer or facility may result in restrictions on the drug or manufacturer or facility, including withdrawal of the drug from the market. We do not have, and currently do not intend to develop, the ability to manufacture material for our clinical trials or on a commercial scale. We expect to continue to contract with third parties to manufacture these materials for us. Reliance on third-party manufacturers entails risks to which we would not be subject if we manufactured products ourselves, including reliance on the third-party manufacturer for regulatory compliance. Our product promotion and advertising will also be subject to regulatory requirements and continuing regulatory review.

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If we fail to comply with applicable continuing regulatory requirements, we may be subject to fines, suspension or withdrawal of regulatory approval, product recalls and seizures, operating restrictions and criminal prosecutions.

Our product candidates may never achieve market acceptance even if we obtain regulatory approvals.

Even if we receive regulatory approvals for the commercial sale of our product candidates, the commercial success of these product candidates will depend on, among other things, their acceptance by physicians, patients, third-party payors and other members of the medical community as a therapeutic and cost-effective alternative to competing products and treatments. If our product candidates fail to gain market acceptance, we may be unable to earn sufficient revenue to continue our business. Market acceptance of, and demand for, any product that we may develop and commercialize will depend on many factors, including:

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our ability to provide acceptable evidence of safety and efficacy;

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the prevalence and severity of adverse side effects;

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the availability, relative cost and relative efficacy of alternative and competing treatments;

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the effectiveness of our marketing and distribution strategy;

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publicity concerning our products, if any, or competing products and treatments; and

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our ability to obtain sufficient third-party insurance coverage or reimbursement.

If our approved product candidates, if any, do not become widely accepted by physicians, patients, third-party payors and other members of the medical community, our business, financial condition and results of operations would be materially and adversely affected.

The pharmaceutical market is intensely competitive. If we are unable to compete effectively with existing drugs, new treatment methods and new technologies, we may be unable to commercialize any drugs that we develop.

The pharmaceutical market is intensely competitive and rapidly changing. Many large pharmaceutical and biotechnology companies, academic institutions, governmental agencies and other public and private research organizations are pursuing the development of novel drugs for the same indications that we are targeting or expect to target.

If PF-655 is approved for wet age-related macular degeneration and/or for diabetic macular edema, we anticipate that it would compete with other marketed therapeutics, particularly vascular endothelial growth factor inhibitor drugs, primarily Genentech’s Lucentis, approved by the FDA for wet age-related macular degeneration and which has become the standard-of-care for the treatment of wet age-related macular degeneration and recently approved for diabetic macular edema by the EMEA in Europe. PF-655 may also face competition from off-label use of Genentech’s Avastin, currently approved for the treatment of various cancers. Additional therapeutics that are in development could also compete with PF-655. These include further anti-vascular endothelial growth factor angiogenesis inhibitors and other drugs. Among these, Macugen®, approved for wet age-related macular degeneration and marketed and sold outside of the United States by Pfizer and in the United States by Eyetech Inc., has been shown to improve vision in patients with diabetic macular edema in Phase III trials, Alcon Research is evaluating Anecortave Acetate (Retaane), an antiangiogenic synthetic steroid drug, Allergan is developing its siRNA drug candidate AGN211745, Regeneron’s intravitreal formulation of soluble decoy receptor vascular endothelial growth factor VEGF Trap-Eye (aflibercept) is in Phase III clinical trials for wet age related macular degeneration in collaboration with Bayer, CoMentis, Inc. is developing ATG3, a topical eye drop therapy, MacuSight and Santen are developing Perceiva (sirolimus, rapamycin) for age related macular degeneration and diabetic macular edema, Ophthotech is developing E10030, a pegylated aptamer that binds and inhibits PDGF in combination with Lucentis, Alimera is developing pSivida’s Iluvien® and intravitreal insert, to deliver fluocinolone acetonide, a corticosteroid, to the retina for up to three years as a treatment for diabetic macular edema and age related macular degeneration.

We are not aware of specific drugs marketed for the prevention of acute renal failure or of delayed graft function in renal transplant patients that would compete with QPI-1002 if it is approved. However, in response

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to the unmet medical need, new products could be developed for the prevention of acute renal failure, such as Action Pharma’s AP214 for acute kidney injury, or existing products could be used off-label, such as Nesiritide, a recombinant form of human B-type natriuretic peptide (hBNP) therapy approved for the treatment of acute congestive heart failure.

Many of our competitors have:

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much greater financial, technical and human resources than we have at every stage of the discovery, development, manufacture and commercialization of products;

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more extensive experience in preclinical testing, conducting clinical trials, obtaining regulatory approvals, and in manufacturing and marketing pharmaceutical products;

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product candidates that are based on previously tested or accepted technologies;

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products that have been approved or are in late stages of development; and

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collaborative arrangements in our target markets with leading companies and research institutions.

We will face intense competition from drugs that have already been approved and accepted by the medical community for the treatment of the indications for which we may develop drugs. We also expect to face competition from new drugs that enter the market. We believe a significant number of drugs are currently under development, and may become commercially available in the future, for the treatment of some conditions for which we are developing or in the future may try to develop drugs, such as wet age-related macular degeneration. Any competitive drugs may be more effective, or marketed and sold more effectively, than any products we develop.

If we successfully develop drug candidates, and obtain approval for them, we will face competition based on many different factors, including:

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the safety and effectiveness of our products;

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the ease with which our products can be administered;

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the timing and scope of regulatory approvals for these products;

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the availability and cost of manufacturing, marketing and sales capabilities;

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price;

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reimbursement coverage; and

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patent position.

Our competitors may develop or commercialize products with significant advantages over any products we develop based on any of the factors listed above or on other factors. Our competitors may therefore be more successful in commercializing their products than we are, which could adversely affect our competitive position and business. Competitive products may make any products we develop obsolete or noncompetitive before we can recover the expenses of developing and commercializing our drug candidates. Furthermore, we also face competition from existing and new treatment methods that reduce or eliminate the need for drugs, such as the use of advanced medical devices. The development of new medical devices or other treatment methods for the indications we are targeting could make our drug candidates noncompetitive, obsolete or uneconomical.

In addition to the competition we face from competing drugs in general, we also face competition from other companies working to develop novel drugs using technology that competes more directly with our own. Any of these companies may develop its RNAi technology more rapidly and more effectively than us. We may also compete with companies working to develop drugs based on an alternative mechanism of the body to suppress the activity of specific genes, known as antisense. Antisense molecules are strands of nucleic acids, deoxyribonucleic acid (DNA) or ribonucleic acid (RNA), complex biomolecules found in all living cells. Antisense molecules interact with complementary strands of nucleic acids to inhibit expression of

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specific genes. The development of antisense drugs is more advanced than that of RNAi therapeutics, and antisense technology may become the preferred technology for drugs that inhibit expression of specific genes.

It is difficult and costly to protect our proprietary rights, and we may not be able to ensure their protection.

Our commercial success will depend in part on obtaining and maintaining patent protection and trade secret protection for our product candidates, their use and the methods used to manufacture them, as well as successfully defending these patents against third-party challenges. Our ability to protect our product candidates from unauthorized making, using, selling, offering to sell or importation by third parties is dependent upon the extent to which we have rights under valid and enforceable patents, or have trade secrets that cover these activities.

We have licensed several patents and patent applications relating to RNAi technology. In addition, we have and are seeking patents in the United States, Europe and selected other jurisdictions for our product candidates, delivery methodologies and target genes. However, any patents we obtain or license from third parties may be challenged, invalidated, held unenforceable or circumvented. The existence of a patent will not necessarily protect us from competition or from claims of a third party that our products infringe their issued patents. No consistent policy regarding the breadth of claims allowed in biotechnology patents has emerged to date in the United States. The biotechnology patent situation outside the United States is even more uncertain.

Despite our efforts and the efforts of our patent associates and consultants in the US and foreign jurisdictions, our pending patent applications may not result in issued patents. The patent position of pharmaceutical and biotechnology companies, including ours, is generally uncertain and involves complex legal, ethical and factual considerations.

There is no uniform, global policy regarding the subject matter and scope of claims allowable in pharmaceutical or biotechnology patents. The criteria applied by the United States Patent and Trademark Office and other patent offices throughout the world to grant patents are not always predictable or uniform. The United States Patent and Trademark Office and its foreign counterparts have upheld stringent standards for RNAi patents that have been prosecuted thus far.

The current international standard for patentability requires that an invention be a) novel; b) non-obvious or have an inventive step; and c) have utility or industrial applicability. However, each national patent office implements the standard differently and each national court interprets the claims independently.

In the US, various District Courts, the Court of Appeals of the Federal Circuit (CAFC) and the Supreme Court (SC) have ruled in cases that set forth new interpretations for the above three requirements, thereby continuously amending the standards for what is considered patentable and increasing the uncertainty of obtaining patent protection.

For example, in September 2010 the USPTO published a 15-page notice updating the 2007 KSR (from the Supreme Court case KSR International Co. v. Teleflex Inc., et al.) Guidelines for Examiners. The update reviews more than 20 of the most relevant Federal Circuit case law dealing with obviousness since KSR. Since the 2007 KSR case the threshold for meeting the non-obviousness requirement has risen. In a recent case heard in the Southern District of New York, the American Civil Liberties Union (ACLU) and other public organizations successfully challenged the validity of patents to human genes. The case has been appealed to the CAFC for review and decision.

In Europe, a ten-year debate led to the 1998 adoption of EU Directive 98/44/EC on the legal protection of biotechnological inventions, known as the “Biotech Patent Directive”. Its purpose is to clarify the distinction between what is patentable and what is not. For example, the directive rules out the patenting of methods of treatment and surgery in a human subject but allows patenting of individual human, animal or plant genes and gene sequences, and their functions, as long as the patentability criteria are fulfilled. Case law continues to evolve in Europe, as in the US. For example, Article 123 of the European Patent Convention is being interpreted very strictly resulting in many patents being found invalid.

In light of the history outlined above, we do not know the degree of future protection for our proprietary rights or the scope of claims that will be allowed in any patents issued to us or to third parties.

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Competitors may successfully challenge our owned and licensed patents, produce similar drugs that do not infringe our patents, or produce drugs in countries where we do not have patent protection or that do not respect our patents. Accordingly, we cannot predict the breadth of claims that may be allowed or enforced in our owned or licensed patents and patent applications. To the extent we rely on third parties for our proprietary rights, we will have limited control over the prosecution, protection and defense of such rights.

The degree of future protection to be afforded by our proprietary rights is uncertain and may not adequately protect our rights or permit us to gain or keep our competitive advantage. For example:

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others may be able to make compounds that are similar to our product candidates but that are not covered by the claims of our patents, or for which we are not licensed under our license agreements;

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we or our licensors or collaborators might not have been the first to make the inventions covered by our pending patent applications, or the pending patent applications and issued patents of our licensors;

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we or our licensors or collaborators might not have been the first to file patent applications for these inventions;

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others may independently develop similar or alternative technologies or duplicate any of our technologies without infringing our intellectual property rights;

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our pending patent applications may not result in issued patents;

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our issued patents and the issued patents of our licensors or collaborators may not provide us with any competitive advantages, or may be held invalid or unenforceable as a result of legal challenges by third parties;

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we may not develop additional proprietary technologies that are patentable; or

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the patents of others may have an adverse effect on our business.

We also may rely on trade secrets to protect our technology, especially where we do not believe patent protection is appropriate or obtainable. However, trade secrets are difficult to protect. Although we use reasonable efforts to protect our trade secrets, our employees, consultants, contractors, outside scientific collaborators and other advisors may unintentionally or willfully disclose our information to competitors. Enforcing a claim that a third party illegally obtained and is using any of our product candidates is expensive and time consuming, and the outcome is unpredictable. In addition, courts outside the United States are sometimes less willing to protect trade secrets. Moreover, our competitors may independently develop equivalent knowledge, methods and know-how.

Our research and development collaborators may have rights to publish data and other information to which we have rights. In addition, we sometimes engage individuals or entities to conduct research that may be relevant to our business. The ability of these individuals or entities to publish or otherwise publicly disclose data and other information generated during the course of their research is subject to certain contractual limitations. These contractual provisions may be insufficient or inadequate to protect our trade secrets and may impair our patent rights. If we do not apply for patent protection prior to such publication or if we cannot otherwise maintain the confidentiality of our technology and other confidential information, then our ability to receive patent protection or protect our proprietary information may be jeopardized.

We may incur substantial costs as a result of litigation or other proceedings relating to patent and other intellectual property rights.

The cost to us of any litigation or other proceedings relating to intellectual property rights, even if resolved in our favor, could be substantial. Some of our competitors may be better able to sustain the costs of complex patent litigation because they have substantially greater resources. Uncertainties resulting from the initiation and continuation of any litigation could have a material adverse effect on our ability to continue our operations. Should third parties file patent applications, or be issued patents claiming technology also claimed by us in pending applications, we may be required to participate in interference proceedings before the U.S. Patent and Trademark Office to determine priority of invention which could result in substantial costs to us or an adverse decision as to the priority of our inventions. An unfavorable outcome in an interference proceeding

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could require us to cease using the technology or to license rights from prevailing third parties. There is no guarantee that any prevailing party would offer us a license or that we could acquire any license made available to us on commercially acceptable terms.

Third parties are, and have been, actively seeking patent protection in the RNAi field. We are aware of a number of currently pending patent applications that, if granted, might arguably cover our activities or product candidates, depending on the scope of claims allowed, if any, including patent applications owned by Merck & Co., Inc., Alnylam Pharmaceuticals, Thermo Fisher Scientific, Isis Pharmaceuticals, Marina Biotech, Sylentis and others. In addition, claims could be made that we infringe existing patents which we have concluded do not cover our work in the RNAi field. Furthermore, patent applications and granted patents may exist of which we are unaware that could cover our work in the RNAi field. If any parties successfully claim that our creation or use of proprietary technologies infringes upon their intellectual property rights, we might be forced to pay damages, potentially including treble damages, if we are found to have willfully infringed on such parties’ patent rights. In addition to any damages we might have to pay, a court could require us to stop the infringing activity or obtain a license. Any license required under any patent may not be made available on commercially acceptable terms, if at all. In addition, such licenses are likely to be non-exclusive and, therefore, our competitors may have access to the same technology licensed to us. If we fail to obtain a required license and are unable to design around a patent, we may be unable to effectively market any products we successfully develop, which could limit our ability to generate revenues or achieve profitability and possibly prevent us from generating revenue sufficient to sustain our operations. Moreover, we expect that a number of our collaborations will provide that royalties payable to us for licenses to our intellectual property may be offset by amounts paid by our collaborators to third parties who have competing or superior intellectual property positions in the relevant fields, which could result in significant reductions in our revenues from any products developed through collaborations.

If we fail to comply with our obligations under any inbound licenses or related agreements, we could lose license rights that are necessary for developing and protecting our RNAi technology and any related product candidates that we develop.

We have licensed certain patents and patent applications from Silence and Alnylam Pharmaceuticals, Inc. relating to RNAi technology, and from University of Illinois Chicago, or UIC, and Dharmacon that are important for the development of our drug candidates. All licensors have the right to terminate their license agreements with us if we default under them. Maintaining our licenses with Silence, Alnylam, UIC and Dharmacon is critical to our continued development of our product candidates. Loss of one or more of these licenses could jeopardize our intellectual property position.

Our current inbound licenses impose, and any future inbound licenses we enter into are likely to impose, various development, commercialization, funding, royalty, diligence, sublicensing, insurance and other obligations on us. If we breach any of these obligations, the licensor may have the right to terminate the license or render the license non-exclusive, which could result in us being unable to develop, manufacture and sell products that are covered by the licensed technology or enable a competitor to gain access to the licensed technology. Additionally, some of these licenses impose field-of-use restrictions that may limit future growth with regard to new markets or products. Our licenses from Alnylam relating to p53 and RTP-801 are limited to products for the treatment of specific diseases. In addition, while we cannot currently determine the amount of the royalty obligations we will be required to pay on sales of future products, if any, the amounts may be significant. The amount of our future royalty obligations will depend on the technology and intellectual property we use in products that we successfully develop and commercialize, if any. Therefore, even if we successfully develop and commercialize products, we may be unable to achieve or maintain profitability.

Confidentiality agreements with employees and others may not adequately prevent disclosure of trade secrets and other proprietary information.

In order to protect our proprietary technology and processes, we rely in part on confidentiality agreements with our licensees, collaborators, employees, consultants, outside scientific collaborators and sponsored researchers and other advisors. These agreements may not effectively prevent disclosure of confidential information and may not provide an adequate remedy in the event of unauthorized disclosure of confidential information. In addition, others may independently discover trade secrets and proprietary

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information, and in such cases we could not assert any trade secret rights against such parties. Costly and time-consuming litigation could be necessary to enforce and determine the scope of our proprietary rights, and failure to obtain or maintain trade secret protection could adversely affect our competitive business position.

We rely on third parties to conduct our clinical trials. If these third parties do not perform as contractually required or otherwise expected, we may not be able to obtain regulatory approval for or commercialize our product candidates.

We rely on third parties, such as contract research organizations, medical institutions, clinical investigators and contract laboratories, to conduct our clinical trials. We have, in the ordinary course of business, entered into agreements with these third parties. Nonetheless, we are responsible for confirming that each of our clinical trials is conducted in accordance with its general investigational plan and protocol. Moreover, the FDA requires us to comply with regulations and standards, commonly referred to as good clinical practices, for conducting, recording and reporting the results of clinical trials to assure that data and reported results are credible and accurate and that the trial participants are adequately protected. Our reliance on third parties does not relieve us of these responsibilities and requirements. If these third parties do not successfully carry out their contractual duties or regulatory obligations or meet expected deadlines, if the third parties need to be replaced or if the quality or accuracy of the data they obtain is compromised due to the failure to adhere to our clinical protocols or regulatory requirements or for other reasons, our preclinical development activities or clinical trials may be extended, delayed, suspended or terminated, and we may not be able to obtain regulatory approval for our product candidates.

We do not have manufacturing experience or resources and we must incur significant costs to develop this expertise or rely on third parties to manufacture our product candidates.

We do not have manufacturing experience for our RNAi drug candidates, which requires us to depend on third parties that might not be able to deliver sufficient quantities of product at acceptable quality levels in a timely manner, or at all. In order to develop products, apply for regulatory approvals and commercialize our products, we will need to develop, contract for, or otherwise arrange for the necessary manufacturing capabilities. We may manufacture clinical trial materials ourselves, but more likely would rely on others to manufacture the materials we will require for any clinical trials that we initiate. Only a limited number of manufacturers supply synthetic siRNA. We currently rely on several contract manufacturers, including Avecia, Agilent Technologies, and BioSpring for our supply of synthetic siRNA, and Pyramid Laboratories for the supply of our final material for clinical trials. There are risks inherent in pharmaceutical manufacturing that could affect the ability of our contract manufacturers to meet our delivery time requirements or provide adequate amounts of material to meet our needs. Included in these risks are synthesis and/or purification failures and contamination during the manufacturing process, both of which could result in unusable product and cause delays in our development process. The manufacturing process for any products that we may develop is an element of the FDA approval process and we need to contract with manufacturers who can meet the FDA requirements on an ongoing basis. In addition, if we receive the necessary regulatory approval for any product candidate, we also expect to rely on third parties, including our collaborators, to produce materials required for commercial production. We may experience difficulty in obtaining adequate manufacturing capacity for our needs. If we are unable to obtain or maintain contract manufacturing for these product candidates, or to do so on commercially reasonable terms, we may not be able to successfully develop and commercialize our products.

To the extent that we enter into manufacturing arrangements with third parties, we will depend on these third parties to perform their obligations in a timely manner and consistent with regulatory requirements. The failure of a third-party manufacturer to perform its obligations as expected could adversely affect our business in a number of ways, including:

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we may not be able to initiate or continue clinical trials of products that are under development;

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we may be delayed in submitting applications for regulatory approvals for our products;

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we may lose the cooperation of our collaborators;

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we may be required to cease distribution or recall some or all batches of our products; and

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ultimately, we may not be able to meet commercial demands for our products.

If a third-party manufacturer with whom we contract fails to perform its obligations, we may be forced to manufacture the materials ourselves, for which we may not have the capabilities or resources, or enter into an agreement with a different third-party manufacturer, which we may not be able to do on reasonable terms, if at all. In addition, if we are required to change manufacturers for any reason, we will be required to verify that the new manufacturer maintains facilities and procedures that comply with quality standards and with all applicable regulations and guidelines. The delays associated with the verification of a new manufacturer or the reverification of an existing manufacturer could negatively affect our ability to develop product candidates or produce approved products in a timely manner or within budget. Furthermore, a manufacturer may possess technology related to the manufacture of our product candidates or approved products that such manufacturer owns independently. This would increase our reliance on such manufacturer or require us to obtain a license from such manufacturer in order to have another third-party manufacture our products.

The loss of members of our management team could substantially disrupt our business operations.

Our success depends to a significant degree upon the continued contributions of our management team, and particularly Daniel Zurr, Ph.D., our founder, President and Chief Executive Officer. The loss of Dr. Zurr, whether from retirement, competing offers, or other causes, could prevent us from executing our business strategy, cause us to lose a strategic partner or otherwise materially affect our operations. Dr. Zurr, as well as the rest of our management team and key employees, are at-will employees, and we do not maintain any key-person life insurance policies.

We rely on highly skilled personnel and if we are unable to retain or motivate key personnel or hire qualified personnel, we may not be able to maintain our operations or grow effectively.

Our performance is largely dependent on the talents and efforts of highly skilled individuals. Our future success depends on our continuing ability to identify, hire, develop, motivate and retain qualified management, clinical and scientific personnel for all areas of our organization. In this regard, in anticipation of increased development and commercialization activities, we are currently planning to increase the total number of our full time employees significantly over the next couple of years. As a result, we expect personnel costs to increase in the future. The increase in costs will depend on the timing and compensation of the new hires. If we are unable to hire and train a sufficient number of qualified employees for any reason, we may not be able to implement our development and commercialization activities or grow effectively. We have in the past maintained a rigorous, highly selective and time-consuming hiring process. We believe that our approach to hiring has significantly contributed to our success to date. However, our highly selective hiring process has made it more difficult for us to hire a sufficient number of qualified employees and, as we grow, our hiring process may prevent us from hiring the personnel we need in a timely manner. If we do not succeed in attracting qualified personnel and retaining and motivating existing personnel, our existing operations may suffer and we may be unable to grow effectively.

We lack marketing and commercialization experience for biopharmaceutical products and we may have to rely on third parties for these capabilities.

We currently do not have sales, marketing or distribution capabilities. We intend to hire sales and marketing personnel to enable us to commercialize some of our product candidates. If we are unsuccessful in hiring and retaining sales and marketing personnel with appropriate technical and sales expertise or in developing an adequate distribution capability to support them, our ability to generate product revenues will be adversely affected. To the extent we cannot or choose not to use internal resources for the marketing, sales or distribution of any potential products in the United States or elsewhere, we intend to rely on collaboration partners or licensees. We may not be able to establish or maintain such relationships. To the extent that we depend on collaboration partners or other third parties for marketing, sales and distribution, any revenues we receive will depend upon their efforts. Such efforts may not be successful, and we will not be able to control the amount and timing of resources that our licensees or collaborators or other third parties devote to our products.

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If any products we develop become subject to unfavorable pricing regulations, third-party reimbursement practices or healthcare reform initiatives, our business could be harmed.

Our ability to commercialize any product candidate profitably will depend in part on the extent to which reimbursement for such product candidate and related treatments will be available from government health administration authorities, private health insurers or private payors, and other organizations in the United States and internationally. Even if we succeed in bringing one or more product candidates to market, these products may not be considered cost-effective, and the amount reimbursed for any product may be insufficient to allow us to sell it profitably. Because our product candidates are in the early stages of development, we are unable at this time to determine their cost-effectiveness and the level or method of reimbursement. There may be significant delays in obtaining coverage for newly approved products, and coverage may be more limited than the purposes for which the product candidate is approved by the FDA or foreign regulatory agencies. Moreover, eligibility for coverage does not mean that any product will be reimbursed in all cases or at a rate that covers our costs, including research, development, manufacture, sale and distribution. Increasingly, the third-party payors who reimburse patients, such as government and private payors, are requiring that companies provide them with predetermined discounts from list prices and are challenging the prices charged for medical products. If the reimbursement we are able to obtain for any product we develop is inadequate in light of our development and other costs, our business could be harmed.

We face potential product liability exposure, and if successful claims are brought against us, we may incur substantial liability for a product candidate and may have to limit its commercialization.

The use of our product candidates in clinical trials and the sale of any products for which we obtain marketing approval expose us to the risk of product liability claims. Product liability claims might be brought against us by consumers, health care providers, pharmaceutical companies or others selling our products. If we cannot successfully defend ourselves against these claims, we will incur substantial liabilities. Regardless of merit or eventual outcome, product liability claims may result in:

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decreased demand for our product candidates;

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impairment of our business reputation;

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withdrawal of clinical trial participants;

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costs of related litigation;

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substantial monetary awards to patients or other claimants;

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loss of revenues; and

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the inability to commercialize our product candidates.

Although we currently have product liability insurance coverage for our global clinical trials for expenses or losses up to an aggregate limit of $10 million, our insurers may not reimburse us, or our insurance coverage may not be sufficient to reimburse us, for any or all expenses or losses we may suffer. Moreover, insurance coverage is becoming increasingly expensive and, in the future, we may not be able to maintain insurance coverage at a reasonable cost or in sufficient amounts to protect us against losses due to liability. We intend to expand our insurance coverage to include the sale of commercial products if we obtain marketing approval for our product candidates in development, but we may be unable to obtain commercially reasonable product liability insurance for any products approved for marketing. On occasion, large judgments have been awarded in class action lawsuits based on products that had unanticipated side effects. A successful product liability claim or series of claims brought against us could cause our stock price to fall and, if judgments exceed our insurance coverage, could decrease our cash and adversely affect our business.

If we or our licensees, collaborators, manufacturers or service providers fail to comply with applicable laws and regulations, we or they could be subject to enforcement actions, which could affect our ability to market and sell our products and may harm our reputation.

If we or our licensees, collaborators, manufacturers or service providers fail to comply with applicable federal, state or foreign laws or regulations, we could be subject to enforcement actions, which could affect

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our ability to develop, market and sell our products under development successfully and could harm our reputation and lead to reduced acceptance of our products by the market. These enforcement actions include:

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warning letters;

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recalls or public notification or medical product safety alerts;

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restrictions on, or prohibitions against, marketing our products;

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restrictions on importation of our products;

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suspension of review or refusal to approve pending applications;

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suspension or withdrawal of product approvals;

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product seizures;

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injunctions; and

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civil and criminal penalties and fines.

We are subject to foreign exchange risk.

We expect to derive substantially all of our revenues in U.S. dollars. However, the substantial majority of our Israeli subsidiary’s expenses are denominated in NIS and we anticipate that a material portion of our Israeli subsidiary’s expenses will continue to be denominated in NIS. We do not engage in foreign currency hedging arrangements. Accordingly, fluctuations in exchange rates between the U.S. dollar and NIS may adversely affect our results of operations.

We may incur significant costs complying with environmental laws and regulations, and failure to comply with these laws and regulations could expose us to significant liabilities.

We use hazardous chemicals and radioactive and biological materials in our business and are subject to a variety of federal, state and local laws and regulations governing the use, generation, manufacture, storage, handling and disposal of these materials. Although we believe our safety procedures for handling and disposing of these materials and waste products comply with these laws and regulations, we cannot eliminate the risk of accidental injury or contamination from the use, storage, handling or disposal of hazardous materials. In the event of contamination or injury, we could be held liable for any resulting damages. We are uninsured for third-party contamination injury.

We have significant operations in Israel, which may be adversely affected by acts of terrorism or major hostilities.

Our primary research and development facilities are located in Ness Ziona, Israel. We are subject to a number of risks and challenges that specifically relate to these operations. Since the establishment of the State of Israel in 1948, a number of armed conflicts have occurred between Israel and its Arab neighbors. Any hostilities involving Israel could adversely affect our operations. In addition, our operations could be materially and adversely affected by acts of terrorism or major hostilities in the Middle East. Any such effects may not be covered by insurance. These operations may not be successful if we are unable to meet and overcome these challenges, which could limit the growth of our business and may have an adverse effect on our business and operating results.

We are subject to the risk of natural disasters, including earthquakes.

We have facilities located in the San Francisco Bay Area, Boulder, Colorado, and Israel. The San Francisco Bay area is in close proximity to known earthquake fault zones. If a fire, earthquake, flood or other natural disaster disrupts our research or development efforts, our business, financial condition and operating results could be materially adversely affected. Although we maintain personal property and general business interruption coverage, we do not maintain earthquake or flood insurance coverage for personal property or resulting business interruption.

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We are selling this offering without an underwriter and may be unable to sell any units. Unless we are successful in selling the units and receiving the proceeds from this offering, we may have to seek alternative financing to implement our business plans.

This offering is not-underwritten on a firm commitment basis. In the event we do not sell at least 30,000 units at a price of at least NIS 3400 ($944.44) per unit, or as may otherwise be necessary to comply with the TASE listing requirements, the offering will be cancelled. In such event we may have to seek alternative financing to implement our business plans.

The market price of our common stock may be highly volatile, and you may not be able to resell your shares at or above the price you paid for them in this offering.

We have applied to list our common stock on the Tel Aviv Stock Exchange. We have not, however, applied to list or have our stock quoted on any stock exchange or quotation system in the United States. Prior to this offering, there has not been a public market for our common stock. We cannot assure you that an active trading market for our common stock will develop in Israel following this offering, and we do not expect that any active public trading market for our common stock will develop in the United States.

You may not be able to sell your shares quickly or at the market price if trading in our common stock is not active.

The trading price of our common stock on the Tel Aviv Stock Exchange is likely to be highly volatile and could be subject to wide fluctuations in price in response to various factors, many of which are beyond our control, including:

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new products or services introduced or announced by us or our licensees or collaborators, or our competitors, and the timing of these introductions or announcements;

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the issuance of patents to competitors;

•

actual or anticipated results from and any delays in our clinical trials;

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actual or anticipated regulatory approvals or our product candidates or competing products;

•

actions taken by regulatory agencies with respect to our product candidates, clinical trials, manufacturing process or sales and marketing activities;

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changes in laws or regulations applicable to our products, including but not limited to clinical trial requirements for approvals;

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the success of our development efforts and clinical trials;

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the success of our efforts to discover, acquire or in-license additional products or product candidates;

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developments concerning our licensing and collaboration arrangements, including but not limited to those with our sources of manufacturing supply;

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actual or anticipated variations in our quarterly operating results;

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announcements of technological innovations by us, our licensees or collaborators, or our competitors;

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actual or anticipated changes in earnings estimates or recommendations by securities analysts;

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conditions or trends in the biotechnology and biopharmaceutical industries;

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announcements by us or our competitors of significant acquisitions, strategic partnerships, joint ventures or capital commitments;

•

general economic and market conditions and other factors that may be unrelated to our operating performance or the operating performance of our competitors;

•

changes in the market valuations of similar companies;

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•

sales of common stock or other securities by us or our shareholders in the future;

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additions or departures of key scientific or management personnel;

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developments relating to proprietary rights held by us or our competitors;

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disputes or other developments relating to proprietary rights, including patents, litigation matters and our ability to obtain patent protection for our technologies; and

•

trading volume of our common stock.

In addition, the stock market in general and the market for biotechnology and biopharmaceutical companies in particular have experienced extreme price and volume fluctuations that have often been unrelated or disproportionate to the operating performance of those companies. These broad market and industry factors may seriously harm the market price of our common stock, regardless of our operating performance. In the past, following periods of volatility in the market, securities class-action litigation has often been instituted against companies. Such litigation, if instituted against us, could result in substantial costs and diversion of management’s attention and resources, which could materially and adversely affect our business and financial condition.

The TASE members accepting orders in the auction process will not be bound by suitability protections for customers purchasing the units akin to FINRA Rule 2310.

The commercial banks or members of TASE in Israel that will be authorized to receive bids from customers wishing to purchase units in this offering are not member firms or registered representatives of the Financial Industry Regulatory Authority, Inc. (“FINRA”). As such, TASE member will not be subject to FINRA Rule 2310 (Recommendations to Customers (Suitability)) that requires that registered representatives take into account several factors such as the customer’s financial status before recommending investments to individual investors (non-institutional). Notwithstanding the foregoing, investment advisors in Israel are subject to the Israeli Law for the Regulation of Investment Advice, Investment Marketing and Investment Management, 1995 that contains, among others, several provisions aimed at protecting the interest of investors, including a requirement to accommodate the service to the needs and instructions of the client.

Following the offering, we shall be subject to certain provisions of the Israel Securities Law — 1968, which deal mainly with disclosure issues, and to certain provisions of Israel Companies Law — 1999, which deal mainly with corporate governance issues. Both provisions differ from US securities laws and the default provisions generally applicable to California corporations, respectively. Certain of these provisions may be unenforceable and shareholder rights may be adversely affected.

As a result of the offering of securities in Israel, we are subject to certain provisions of the Israel Securities Law — 1968. Pursuant to Section 39A of the Israel Securities Law — 1968, rules and regulations of the Israeli Companies Law — 1999 listed in the Fourth Schedule to the Israel Securities Law apply to issuers incorporated in jurisdictions outside Israel which offer securities to the public in Israel.

In addition, pursuant to Section 39A of the Israel Securities Law, we are subject to a number of other provisions of the Israeli Companies Law, including provisions applicable to:

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Our Chairman of the Board of Directors and our Chief Executive Officer (Sections 95 and 121(c) of the Israeli Companies Law)

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proxy statements required under the Israeli Companies Law (Sections 87 and 89 of the Israeli Companies Law);

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our Audit Committee (Sections 114 to 117 of the Israeli Companies Law), our Internal Auditor (Sections 146 to 153 of the Israeli Companies Law);

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derivative claims and class action lawsuits (Sections 194 to 218 of the Israeli Companies Law);

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duties of officers (Sections 252 to 256 of the Israeli Companies Law);

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transactions with controlling stockholders (Sections 270(d) and 275 to 282 of the Israeli Companies Law and all regulations promulgated thereunder);

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The appointment of external directors (Sections 239 to 249A of the Israeli Companies Law);

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Tender offers (sections 328 to 340 and 342 of the Israeli Companies Law) and Israel Securities Regulations (Purchase Offers), 2000,

The foregoing provisions of Israeli law are only applicable to the extent permitted by California law. In the event of a conflict between these provisions and California law, California law will prevail.

Our largest shareholder and management beneficially own a significant percentage of our stock and will be able to exercise significant influence over matters subject to shareholder approval.

As of February 28, 2011, our executive officers, directors and largest shareholder, together with their respective affiliates, beneficially owned approximately 80.1% of our voting stock, including shares subject to outstanding options and warrants, and we expect that upon completion of this offering, that same group will continue to beneficially own at least 64.4% of our outstanding voting stock assuming the sale of 37,500 units in this offering and no sales to our existing principal shareholders and assuming no purchase of any additional allotment of units. Accordingly, even after this offering, these shareholders will be able to exert a significant degree of influence over our management and affairs and over matters requiring shareholder approval, including the election of our board of directors and approval of significant corporate transactions. This concentration of ownership could have the effect of delaying or preventing a change in our control or otherwise discouraging a potential acquirer from attempting to obtain control of us, which in turn could have a material and adverse effect on the fair market value of our common stock.

We will incur significant increased costs as a result of operating as a public company, and our management will be required to devote substantial time to new compliance initiatives.

As a public company, we will incur significant legal, accounting and other expenses that we did not incur as a private company. In addition, the Sarbanes-Oxley Act of 2002, as well as rules implemented by the Securities and Exchange Commission and Israel Securities Authority, imposes various requirements on public companies, including requiring the establishment and maintenance of effective disclosure and financial controls and changes in corporate governance practices. Our management and other personnel will need to devote a substantial amount of time to these new compliance initiatives. Moreover, these rules and regulations will increase our legal and financial compliance costs and will make some activities more time-consuming and costly. For example, we expect director and officer liability insurance to be expensive, and we may be required to incur substantial costs to maintain the same or similar coverage in the future.

The Sarbanes-Oxley Act of 2002 requires, among other things, that we maintain effective internal control over financial reporting and disclosure controls and procedures. In particular we must perform system and process evaluation and testing of our internal control over financial reporting to allow management and our independent registered public accounting firm to report on the effectiveness of our internal control over financial reporting, as required by Section 404 of the Sarbanes-Oxley Act. As a result of our compliance with Section 404, we will incur substantial accounting expense and expend significant management efforts and we will need to hire additional accounting and financial staff with appropriate public company experience and technical accounting knowledge to ensure such compliance. As a reporting corporation under the Israel Securities Law, we will also be required to file periodic and immediate reports according to the Israel Securities Law and regulations, resulting in significant additional legal, accounting and other expenses. We expect these expenses will be increased by our need to reconcile the requirements of U.S. and Israeli laws, and the fact that the Israel Securities Law and regulations are designed mainly for companies incorporated under the Israel Companies Act, as opposed to under U.S. law, as we are.

Future sales of our common stock in the public market could cause our stock price to fall.

Sales of a substantial number of shares of our common stock in the public market after this offering, or the perception that these sales might occur, could depress the market price of our common stock and could impair our ability to raise capital through the sale of additional equity securities. After this offering, we will have up to 27,009,630 shares of common stock outstanding assuming the sale of 37,500 units in this offering and no sales to our existing principal shareholders and assuming no purchase of any additional allotment of units, without giving effect to an additional allotment of units, if any.

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Under the rules of the Tel Aviv stock exchange, certain of our stockholders will be restricted from selling our securities for between three and 18 months following this offering. These restrictions, together with additional restrictions under U.S. securities laws are described in “Shares Eligible for Future Sale,” limit the number of shares of common stock that may be sold immediately following this offering.

All of the shares of common stock and warrants sold in this offering will be freely tradable without restrictions or further registration under the Securities Act of 1933, as amended, except for any shares purchased by our affiliates as defined in Rule 144 under the Securities Act of 1933, as amended. 21,384,630 shares of common stock outstanding as of February 28, 2011, plus an additional 2,610,274 shares issuable upon the exercise of outstanding options will be available for sale, subject to volume limitations under Rule 144 under the Securities Act of 1933, as amended and the restrictions imposed by the Tel Aviv Stock Exchange.

After this offering, the holders of approximately 17,996,100 shares of common stock based on shares outstanding as of February 28, 2011, will be entitled to rights with respect to registration of such shares under the Securities Act of 1933, as amended. If such holders, by exercising their registration rights, cause a large number of securities to be registered and sold in the public market, these sales could have an adverse effect on the market price for our common stock. If we were to initiate a registration and include shares held by these holders pursuant to the exercise of their registration rights, these sales may impair our ability to raise capital.

Anti-takeover provisions in our charter documents and under California and Israeli law could make an acquisition of us, which may be beneficial to our shareholders, more difficult and may prevent attempts by our shareholders to replace or remove our current management.

Provisions in our articles of incorporation and our bylaws may delay or prevent an acquisition of us that would be beneficial to shareholders or a change in our management. In addition, these provisions may frustrate or prevent any attempts by our shareholders to replace or remove our current management by making it more difficult for shareholders to replace members of our board of directors. Because our board of directors is responsible for appointing the members of our management team, these provisions could in turn affect any attempt by our shareholders to replace current members of our management team. These provisions include:

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a prohibition on actions by our shareholders by written consent;

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advance notice requirements for election to our board of directors and for proposing matters that can be acted upon at shareholder meetings; and

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the ability of our board of directors to amend our bylaws without shareholder approval.

In addition, as a California corporation, we are subject to the provisions of Section 1203 of the California Corporations Code, which requires us to provide a fairness opinion to our shareholders in connection with their consideration of any proposed “interested party” reorganization transaction. These provisions could make it more difficult for a third party to acquire a majority of our outstanding voting stock by discouraging a hostile bid, or delaying, preventing or deterring a merger, acquisition or tender offer in which our shareholders could receive a premium for their shares, or effect a proxy contest for control of Quark or other changes in our management, even if the proposed acquisition or change in management could be considered beneficial by some shareholders.

Further, Sections 328 through 340 and Section 342A of the Israeli Companies Law may be applicable to us due to our listing on the TASE. These provisions relate to special tender offers and forced sales of shares. The Israeli Companies Law provides that an acquisition of shares of a public company must be made by means of a special tender offer if, as a result of the acquisition, the purchaser would become a holder of 25% or more of the voting rights of the company. This rule does not apply if there is already another holder of 25% or more of the voting rights of the company. Similarly, the Israeli Companies Law provides that an acquisition of shares in a public company must be made by means of a special tender offer if as a result of the acquisition the purchaser would become a holder of more than 45% of the voting rights of the company, if there is no other shareholder of the company who holds more than 45% of the voting rights of the company. These requirements do not apply if the acquisition of shares (i) occurs in the context of a private placement by the company approved by shareholders; (ii) was from a shareholder holding 25% or more of the

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outstanding shares of the company and resulted in the acquirer becoming a holder of 25% or more of the outstanding shares of the company; or (iii) was from a shareholder holding more than 45% of the outstanding shares of the company and resulted in the acquirer becoming a holder of more than 45% of the outstanding shares of the company.

A special tender offer must be extended to all shareholders but the offer may be limited to acquire a predefined number of shares. A special tender offer may be consummated only if: (i) at least 5% of the company’s outstanding voting shares will be acquired by the offeror; and (ii) the number of shares tendered in the offer exceeds the number of shares whose holders rejected the offer.

If a special tender offer is made, the target company’s board of directors is required to express its opinion on the advisability of the offer or abstain from expressing any opinion if it is unable to do so, provided that it gives the reasons for its abstention. There are also certain limitations and duties imposed on officers in the course of special tender offer.

Shares purchased in contravention of these requirements of the Israeli Companies Law will not confer any rights and will be “dormant'' shares as defined in the Israeli Companies Law as long as the shares are owned by the purchaser, to the extent enforceable under California law.

In the event that a special tender offer is accepted, the purchaser (or any person or entity controlling it or under common control with the purchaser or such controlling person or entity) must refrain from making a subsequent tender offer for the purchase of shares of the target company and may not execute a merger with the target company for a period of one year from the date of the offer, unless the purchaser (or such person or entity) undertook to effect such an offer or merger in the initial special tender offer.

Under the Israeli Companies Law, a person wishing to acquire shares of a public company and who would, as a result, hold more than 90% of the target company’s issued and outstanding share capital is required to make a tender offer to all of the company’s shareholders for the purchase of all of the issued and outstanding shares of the company. If the shareholders who do not accept the offer hold less than 5% of the issued and outstanding share capital of the company, all of the shares that the acquirer offered to purchase will be transferred to the acquirer to the extent enforceable under California law. However, a shareholder that had its shares so transferred may, within three months from the date of acceptance of the tender offer, petition a court to determine whether the tender offer was for less than fair value and whether the fair value should be paid to the shareholder. If the shareholders who did not accept the tender offer hold at least 5% of the issued and outstanding share capital of the company, the acquirer may not acquire the shares of the company that will increase its holdings to more than 90% of the company’s issued and outstanding shares.

Special or full tender offers with respect to a company are also governed by regulations under the Israeli Securities Law. The Israeli Securities Regulations (Tender Offer), 2000 (the “Tender Offer Regulations'') provide that: (i) a tender offer will be irrevocable and may not be conditional, other than in the circumstances set out in the Tender Offer Regulations; (ii) a tender offer must be made to all holders of the class of securities which is the subject of the tender offer on equal terms; (iii) a tender offer must be made in writing, and in accordance with the disclosure requirements provided in the Tender Offer Regulations; and (iv) the tender offer must be open for a minimum period, as set out in the Tender Offer Regulations.

In addition, the Tender Offer Regulations provide that an action by a person or someone on his behalf that is designed to induce security holders to sell their securities to such person, shall be deemed a “Regular Tender Offer'', other than for (i) purchases on the Tel Aviv Stock Exchange, or (ii) offers to acquire less than 5% of the relevant listed securities during a six month period. If an action is deemed to be a “Regular Tender Offer'', it will be subject to the requirements of the Tender Offer Regulations, including the public filing of certain disclosure requirements with the Israeli Securities Authority.

If you purchase shares of common stock sold in this offering, you will experience immediate dilution. You will experience further dilution if we issue shares in future financing transactions or upon exercise of options or warrants.

If you purchase shares of common stock in this offering, based on an assumed offering price of $10 per share of common stock and a corresponding one-half warrant, and an assumed offering size of 37,500 units, you will experience immediate dilution of $8.61 per share because the price that you pay will be substantially

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greater than the net tangible book value per share of the shares you acquire. This dilution is due in large part to the fact that most of our earlier investors paid substantially less than the initial public offering price when they purchased their shares. If we issue additional common stock or issue securities convertible into or exchangeable or exercisable for common stock, our shareholders will experience additional dilution. In addition, if we raise additional funds through the sale of equity securities, new investors could have rights superior to our existing shareholders.

Because our management will have broad discretion over the use of the net proceeds from this offering, you may not agree with how we use them and the proceeds may not be invested successfully.

We intend to use the net proceeds from this offering for general corporate purposes, and therefore, our management will have broad discretion as to the use of the offering proceeds. Accordingly, you will be relying on the judgment of our management with regard to the use of these net proceeds, and you will not have the opportunity, as part of your investment decision, to assess whether the proceeds are being used appropriately. It is possible that the proceeds will be invested in a way that does not yield a favorable, or any, return for our company.

We have not declared any dividends on our common stock to date, and we have no intention of declaring dividends in the foreseeable future.

The decision to pay cash dividends on our common stock rests with our board of directors and will depend on our earnings, unencumbered cash, capital requirements and financial condition. We do not anticipate declaring any dividends in the foreseeable future, as we intend to use any excess cash to fund our operations. Investors in our common stock should not expect to receive dividend income on their investment, and investors will be dependent on the appreciation of our common stock to earn a return on their investment. Additionally, our ability to pay future dividends may be restricted by the terms of any debt financing and tax considerations.

The auction process may result in a phenomenon known as the “winner’s curse,” and, as a result, investors may experience significant losses.

The auction process may result in a phenomenon known as the “winner’s curse.” At the conclusion of the auction, bidders that receive allocations of units in this offering (successful bidders) may infer that there is little incremental demand for our shares above or equal to the public trading price. As a result, successful bidders may conclude that they paid too much for our units and could seek to immediately sell their shares to limit their losses should our stock price decline. In this situation, other investors that did not submit successful bids may wait for this selling to be completed, resulting in reduced demand for our common stock in the public market and a significant decline in our stock price. Therefore, we caution investors that submitting successful bids and receiving allocations may be followed by a significant decline in the value of their investment in our common stock shortly after our offering.

Successful bidders may receive the full number of units subject to their bids, so potential investors should not make bids for more units than they are prepared to purchase.

Successful bidders may be allocated all or almost all of the units that they bid for in the auction. Therefore, we caution investors against submitting a bid that does not accurately represent the number of units that they are willing and prepared to purchase.

If research analysts publish or establish target prices for our common stock that are below the offering price for our units or the then current trading market price of our shares, the price of our shares of common stock may fall.

Although the offering price of our units may have little or no relationship to the price determined using traditional valuation methods, research analysts may rely on these methods to establish target prices for our common stock. If research analysts publish target prices for our common stock that are below the offering price of our units or the then current trading market price of our shares, our stock price may decline.

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The mechanics of our bid process make it difficult for persons not having an account with a TASE member at the time of the bid process to place a bid for our units.

We are conducting our bid process in compliance with the rules of the TASE and the Israeli Securities Authority. As a result of the manner in which we are conducting the offering and while the bidding process is open to everyone, bids must be submitted through TASE members. For description of the offering mechanism, see “Plan of Distribution.” The need to submit a bid through a TASE member makes it potentially difficult and costly for persons not having an account with a TASE member to bid on our units.

Some TASE members may not accept a prospective investor’s bid, unless certain credit conditions, determined by the TASE member, are satisfied.

A TASE member will be required to guarantee and is responsible for the payment of accepted bids that had been submitted by that TASE member. In order to submit a bid on behalf of a prospective investor, a TASE member may require collateral and/or verification of the investor’s creditworthiness. Any such credit requirements are unique to the TASE member, and due to the nature of the auction process in Israel, we are not able to influence them. In certain cases, TASE members may require a prospective investor to have liquid funds available in his or her account prior to submitting an order on that investor’s behalf, and funds in such account may be locked up and not available for withdrawal by the investor during the period between the close of the auction and the acceptance of bids.

The amount of proceeds from this offering is dependent upon the outcome of the auction process.

The amounts set forth in the “Use of Proceeds” section indicate our proposed use of proceeds from this offering. Due to the nature of the auction process, the outcome of the auction will determine the proceeds of the offering and there is no assurance that we will be able to sell any units in this offering. The offering will not be completed, and bids submitted will be cancelled, if the minimal amount indicated in the “Use of Proceeds” section shall not be achieved as a result of the offering.

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FORWARD-LOOKING STATEMENTS

Some of the statements under the sections of this prospectus entitled “Prospectus Summary,” “Risk Factors,” “Use of Proceeds,” “Management’s Discussion and Analysis of Financial Condition and Results of Operations” and “Business” and elsewhere in this prospectus contain forward-looking statements. In some cases, you can identify forward-looking statements by the following words: “anticipate,” “believe,” “continue,” “could,” “estimate,” “expect,” “intend,” “may,” “ongoing,” “plan,” “potential,” “predict,” “project,” “should,” “will,” “would,” or the negative of these terms or other comparable terminology, although not all forward-looking statements contain these words. These statements involve known and unknown risks, uncertainties and other factors that may cause our actual results, levels of activity, performance or achievements to be materially different from the information expressed or implied by these forward-looking statements. Although we believe that we have a reasonable basis for each forward-looking statement contained in this prospectus, we caution you that these statements are based on a combination of facts and factors currently known by us and our projections of the future, about which we cannot be certain. Many important factors affect our ability to achieve our objectives, including:

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our ability to continue to develop our product candidates;

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the successful and timely completion of clinical trials;

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our ability to maintain and form relationships with our licensees and collaborators;

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our ability to obtain and maintain regulatory clearance or approval of our products;

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the impact of competition on our product candidates; and

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our ability to obtain and maintain intellectual property protection for our products.

In addition, you should refer to the section of this prospectus entitled “Risk Factors” for a discussion of other important factors that may cause our actual results to differ materially from those expressed or implied by our forward-looking statements. As a result of these factors, we cannot assure you that the forward-looking statements in this prospectus will prove to be accurate. Furthermore, if our forward-looking statements prove to be inaccurate, the inaccuracy may be material. In light of the significant uncertainties in these forward-looking statements, you should not regard these statements as a representation or warranty by us or any other person that we will achieve our objectives and plans in any specified time frame, or at all.

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USE OF PROCEEDS

We estimate that the net proceeds from the sale of units comprised of 100 shares of our common stock and 50 warrants, with each warrant exercisable into one share of our common stock, in this offering will be a maximum of approximately 155.84 million NIS (approximately $43.29 million) based upon the maximum number of units offered multiplied by the maximum price per unit, and a minimum of approximately 92.34 million NIS (approximately $25.65 million), based upon the minimum number of units multiplied by the minimum price per unit, after deducting estimated distribution commissions and offering expenses payable by us, excluding proceeds received from the exercise of the warrants and excluding an additional allotment of units, if any. The offering price will be determined in an auction process, as detailed under the heading “Plan of Distribution” beginning on page 133 of this prospectus, and shall not be lower than NIS 3,400 per unit (approximately $944.44), the minimum price for the purpose of this offering. There is no assurance that we will sell the maximum number of units or that we will sell any units at all. Each $1.00 increase (decrease) in the assumed initial public offering price of $10.00 per share of common stock and a corresponding one-half of a Warrant, which is the midpoint of the estimated price range, as set forth on the cover page of this prospectus, would increase (decrease) net proceeds to us from this offering by approximately $3.50 million, assuming the number of units offered by us is at the midpoint of the estimated range of units offered, as set forth on the cover page of this prospectus, and after deducting the estimated distribution commissions and offering expenses payable by us, excluding proceeds received from the exercise of the warrants. We may also increase or decrease the number of units we are offering. Each increase (decrease) of one thousand units (or 100,000 shares of common stock and a corresponding 50,000 Warrants) in the number of units offered by us would increase (decrease) the net proceeds to us from this offering by approximately $0.94 million, assuming that the assumed initial public offering price remains the same, and after deducting the estimated discounts and commissions and offering expenses payable by us, excluding proceeds received from the exercise of the warrants. We do not expect that a change in the offering price or the number of units by these amounts would have a material effect on our uses of the net proceeds from this offering, although it may impact the amount of time prior to which we will need to seek additional capital. We will not receive any proceeds from the exercise of the warrants unless and to the extent that the warrants are exercised. In general, our top priority is the completion of development of clinical and preclinical stage products that are subject to agreements with third parties (including option, license and collaboration). We currently expect to use our net proceeds from this offering, together with existing cash resources and anticipated funding from existing collaborators, to conduct the clinical trials listed below in order of priority, subject to the receipt of necessary regulatory approvals and achievement of other milestones together with the continued progression of our preclinical pipeline:

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Approximately $19.8 million to complete the Phase IIb clinical trial of PF-655 for diabetic macular edema, pursuant to our License Agreement with Pfizer, as amended.

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Approximately $12.4 million to conduct the Phase II clinical trial of our product candidate QPI-1002 for delayed graft function until the interim data review that enables us to determine whether that trial is complete, pursuant to our Option Agreement with Novartis;

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Approximately $8.9 million to conduct the Phase II clinical trial of our product candidate QPI-1002 for acute kidney injury until the interim data review that enables us to determine whether that trial is feasible in its existing design, pursuant to our Option Agreement with Novartis; and

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Approximately $2.0 million to complete Stratum 2, the proof of concept part of the Phase I clinical trial of our product candidate QPI-1007.

If our financial resources permit, we would also seek to conduct a Phase II clinical trial of our product QPI-1007 in non-arteritic anterior ischemic neuropathy and/or glaucoma. However, these clinical trials would be secondary to the completion of the trials described above as to which we have contractual commitments.

Should our future financial position not be sufficient to complete all such programs, we will allocate the resources available to the clinical programs rather than to preclinical development and research, in the order of priority listed above. For the completion of some of our programs, we may be required to obtain additional financing from the sale of equity or debt securities in order to complete such trials. For example, should the net proceeds to us from this offering approximate the minimum proceeds as set forth above, we would use our net proceeds from this offering, together with existing cash resources and anticipated funding from existing collaborators, to conduct only the clinical trials as follows:

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•

Approximately $12.8 million to conduct the Phase IIb clinical trial of PF-655 for diabetic macular edema, pursuant to our License Agreement with Pfizer as amended, until completion of the interim data review that enables us determine whether the trial should be stopped or continued, based on interim data analysis indicating that the milestone may be achieved;

•

We may also seek to obtain debt or other non-equity financing to cover a portion of the costs to complete development and commercialize any or all of our drug candidates, to fund development of our other preclinical and early-stage product candidates and/or for the acquisition or in-licensing of, or investment in, products, product candidates, or companies that complement our business. However, we have no current understandings, commitments or agreements with respect to any such potential financing.

The expected use of the net proceeds of this offering represents our current intentions based upon our present plans and business conditions. We anticipate that the net proceeds we receive in this offering, together with our existing cash resources and anticipated research and development funding and milestone payments from existing collaborators, will be sufficient to fund our operations through the first half of 2013. The amounts we actually expend in these areas will depend upon a number of factors, including the success of research and product development efforts, FDA approval of our products, cash generated from future operations and actual expenses to operate our business. The use of proceeds as specified above are our estimates as of the date of this prospectus, however, we cannot be certain of all of the particular uses for the net proceeds to be received upon the closing of this offering. Our management will have broad discretion in the application of the net proceeds, and investors will be relying on the judgment of our management regarding the application of the proceeds of this offering.

The amount and timing of our expenditures will depend on several factors, including the progress of our research and development efforts and the amount of cash used by our operations. Pending their uses, we plan to invest the net proceeds of this offering in short- and intermediate-term, interest-bearing obligations, investment-grade instruments, certificates of deposit or direct or guaranteed obligations of the U.S. government.

The offering coordinator, Clal Finance Betucha Investment Management Ltd., will hold the offering proceeds in trust after the pricing of the offering and before the issuance of the units. Prior to the public tender, as described in the Plan of Distribution, the offering coordinator will open a special trust account at a banking corporation in the name of Quark, bearing interest, and will provide the TASE members with the details of the trust account, which will be used for the monies received from persons ordering units in the offering. The trust account will be managed exclusively by the offering coordinator for and on behalf of Quark, in accordance with section 28 of the Israel Securities Law. Monies accrued to the trust account are expected to be invested by the offering coordinator in unlinked, liquid deposits bearing daily interest, to the extent possible. If, at the end of the public tender, all the units on offer have been purchased and TASE approval has been obtained to list the units for trading, the offering coordinator will pay the monies and interest accrued in the trust account to Quark.

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DIVIDEND POLICY

We have never declared or paid any cash dividends on our capital stock. We currently intend to retain all available funds and any future earnings to support our operations and finance the growth and development of our business. We do not intend to pay cash dividends on our common stock for the foreseeable future. Any future determination related to dividend policy will be made at the discretion of our board of directors.

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CAPITALIZATION

The following table sets forth our capitalization as of December 31, 2010:

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on an actual basis;

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on a pro-forma basis to reflect:

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the conversion of all of our outstanding shares of preferred stock into 17,996,100 shares of common stock immediately prior to the closing of this offering; and

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on a pro-forma as adjusted basis, based upon an assumed initial public offering price of $10.00 per share of common stock and corresponding one-half of a Warrant, which is the midpoint of the estimated price range, as set forth on the cover page of this prospectus, to reflect:

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the conversion of all of our outstanding shares of preferred stock into 17,996,100 shares of common stock immediately prior to the closing of this offering; and

•

the sale of 37,500 units assuming the number of units offered by us under this prospectus is the midpoint of the estimated range of units, as set forth on the cover page of this prospectus, with each unit comprised of 100 shares of common stock and 50 warrants, with each warrant exercisable into one share of common stock, at an assumed initial offering price of 36 NIS (approximately $10) per share and a corresponding one-half of a warrant, which is the midpoint of the estimated pricing range, as set forth on the cover page of this prospectus, after deducting underwriting discounts and commissions and estimated offering expenses.

You should read the information in this table together with our financial statements and accompanying notes and “Management’s Discussion and Analysis of Financial Condition and Results of Operations” appearing elsewhere in this prospectus.


	As of December 31, 2010
	Actual			Pro-forma			Pro-forma as adjusted
	(in thousands, except share and per share data)
Series H Redeemable Convertible Preferred stock $0.001 par value:
7,700,000 shares authorized at December 31, 2010, 7,700,000 issued and outstanding at December 31, 2010; Aggregate liquidation preference of $46,200 at December 31, 2010; No shares authorized or issued and outstanding proforma and pro-forma as adjusted	$	38,500		$	—		$	—
Stockholders’ equity:
Common stock $0.001 par value:
Authorized: 74,800,000 shares at December 31, 2010; Issued and outstanding: 3,388,530 shares at December 31, 2010; 74,800,000 shares authorized and 21,384,630 shares, issued and outstanding pro-forma; 74,800,000 shares authorized and 25,134,630 shares, issued and outstanding pro-forma as adjusted		3			21			25
Series A – G Convertible Preferred stock $0.001 par value:
Authorized: 25,882,410 shares at December 31, 2010; Issued and outstanding: 25,879,611 shares issued at December 31, 2010; Aggregate liquidation preference of $86,443 at December 31, 2010; none issued and outstanding pro-forma and pro-forma as adjusted		26			—			—
Additional paid in capital		77,539			116,047			149,981
Accumulated deficit		(114,951	)		(114,951	)		(114,951	)

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	As of December 31, 2010
	Actual			Pro-forma		Pro-forma as adjusted
	(in thousands, except share and per share data)
Total stockholders’ equity		(37,383	)		1,117		35,055
Total capitalization		(37,383	)		1,117		35,055

Each $1.00 increase (decrease) in the assumed initial public offering price of $10 per share and a corresponding one-half of a warrant, which is the midpoint of the estimated price range, as set forth on the cover page of this prospectus, would increase (decrease) each of additional paid-in capital, total shareholders’ equity and total capitalization by approximately $3.50 million, assuming that the number of units offered by us, as set forth on the cover page of this prospectus, remains the same, and after deducting estimated distribution commissions and offering expenses payable by us, excluding proceeds received from the exercise of the warrants. We may also increase or decrease the number of units we are offering. Each increase (decrease) of one thousand units (or 100,000 shares of common stock and a corresponding 50,000 Warrants) in the number of units offered by us would increase (decrease) each of additional paid-in capital, total shareholders’ equity and total capitalization by approximately $0.94 million, assuming that the assumed initial public offering price remains the same, and after deducting the estimated distribution commissions and estimated offering expenses payable by us, excluding proceeds received from the exercise of the warrants. The pro forma as adjusted information discussed above is illustrative only and will be adjusted based on the actual initial public offering price and other terms of this offering determined at pricing.

The outstanding share information in the table above is as of December 31, 2010 and excludes:

•

warrants exercisable for 1,875,000 shares of our common stock to be sold in this offering;

•

warrants exercisable for 187,500 shares of our common stock to be issued to our distributors in this offering;

•

an additional allotment of units, if any;

•

2,618,624 shares of common stock issuable upon the exercise of outstanding options with a weighted average exercise price of $1.90 per share; and

•

652,398 shares of common stock reserved for future issuance under our 1997 Stock Plan and 2007 Equity Incentive Plan.

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DILUTION

If you invest in our units in this offering, your ownership interest in our common stock will be diluted to the extent of the difference between the initial public offering price per share and the proforma net tangible book value per share of our common stock after this offering. Net tangible book value per share is determined by dividing the number of outstanding shares of our common stock into our total tangible assets (total assets less intangible assets) less total liabilities (including redeemable preferred stock). As of December 31, 2010, we had a historical net tangible book value of our common stock of $(37) million, or approximately $(11.03) per share, not taking into account the conversion of our outstanding convertible preferred stock. The pro forma net tangible book value of our common stock as of December 31, 2010 was approximately $1.11 million, or approximately $0.05 per share, based on the number of shares outstanding as of December 31, 2010, after giving effect to the conversion of the redeemable preferred stock and all outstanding convertible preferred stock into shares of common stock prior to completion of this offering.

Investors participating in this offering will incur immediate, substantial dilution. After giving effect to the sale of the 37,500 units offered in this offering, which is the midpoint of the estimated range, as set forth on the cover page of this prospectus, at an assumed initial public offering price of $10 per share of common stock and a corresponding one-half of a warrant comprising each unit, which is the midpoint of the estimated price range, as set forth on the cover page of this prospectus, after deducting estimated distribution commissions and offering expenses payable by us, our pro forma as adjusted net tangible book value as of December 31, 2010, would have been approximately $35.05 million, or approximately $1.39 per share of common stock, excluding proceeds received from the exercise of the warrants. This represents an immediate increase in pro forma as adjusted net tangible book value of $1.34 per share to existing shareholders, and an immediate dilution of $8.61 per share to investors participating in this offering. As set forth on the cover page of this prospectus, we are offering units comprised of 100 shares of common stock and 50 warrants, with each warrant exercisable for one share of common stock, The following table illustrates this per share dilution:


Assumed initial public offering price per share of common stock and a corresponding one-half of a warrant comprising each unit			$	10.00
Historical net tangible book value per share as of December 31, 2010	(11.03	)
Pro forma increase in net tangible book value per share attributable to conversion of redeemable preferred stock and convertible preferred stock	11.08
Pro forma net tangible book value per share before this offering	0.05
Pro forma increase in net tangible book value per share attributable to investors participating in this offering	1.34
Pro forma as adjusted net tangible book value per share after this offering	1.39
Pro forma dilution per share to investors participating in this offering			$	8.61

Each $1.00 decrease in the assumed initial public offering price of $10 per share of common stock and a corresponding one-half of a warrant, would decrease our pro forma as adjusted net tangible book value by approximately $3.50 million, or approximately $0.14 per share. The pro forma dilution per share to investors in this offering would be approximately $7.74 per share, assuming that the number of shares offered by us, as set forth on the cover page of this prospectus, remains the same and after deducting underwriting discounts and commissions and estimated offering expenses payable by us, excluding proceeds received from the exercise of the warrants. We may also increase or decrease the number of shares we are offering. An increase of one thousand units (or 100,000 shares of common stock and a corresponding 50,000 Warrants) in the number of units offered by us, over and above the maximum number of shares specified on the cover of this prospectus, would increase our pro forma as adjusted net tangible book value by approximately $0.94 million, or $0.04 per share, and the pro forma dilution per share to investors in this offering would be $8.57 per share, assuming that the assumed initial public offering price remains the same, and after deducting the estimated distribution commissions and estimated offering expenses payable by us, excluding proceeds received from the exercise of the warrants. Similarly, a decrease of one thousand units in the number of units offered by us would decrease our pro forma as adjusted net tangible book value by approximately $0.94 million, or $0.03

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per share, and the pro forma dilution per share to investors in this offering would be $8.64 per share, assuming that the assumed initial public offering price remains the same, and after deducting the estimated distribution and commissions and offering expenses payable by us, excluding proceeds received from the exercise of the warrants. The pro forma as adjusted information discussed above is illustrative only and will be adjusted based on the actual initial public offering price and other terms of this offering determined at pricing.

The following table summarizes, on a pro forma basis as of December 31, 2010, the differences between the number of shares of common stock purchased from us, the total consideration and the weighted average price per share paid by existing shareholders and by investors participating in this offering at an assumed initial public offering price of $10 per share of common stock and a corresponding one-half of a warrant, which is the midpoint of the estimated pricing range, as set forth on the cover page of this prospectus, and before deducting estimated distribution commissions and offering expenses and warrants to be issued to our distributors as part of their commission payable by us:


	Total consideration										Weighted average price per share
	Number		Percent			Amount		Percent			Weighted average price per share
	(in thousands)
Existing shareholders before this offering		21,384,630		85	%		116,068		76	%		5.43
Investors participating in this offering		3,750,000		15	%		37,500		24	%		10.00
Total		25,134,630		100	%		153,568		100	%		—

The above discussion and tables are as of December 31, 2010 and exclude:

•

2,618,624 shares of common stock issuable upon the exercise of outstanding options with a weighted average exercise price of $1.90 per share;

•

1,875,000 warrants, with each warrant exercisable for one share of common stock, upon issuance of 37,500 units in this offering; and

•

an additional allotment of units, if any;

•

652,398 shares of common stock reserved for future issuance under our 1997 Stock Plan and 2007 Equity Incentive Plan.

The following table summarizes, on a pro forma basis as of December 31, 2010, after giving effect to the exercise of all stock options and warrants outstanding as of December 31, 2010, the differences between the number of shares of common stock purchased from us, the total consideration and the weighted average price per share paid by existing shareholders and by investors participating in this offering at an assumed initial public offering price of $10 per share of common stock and a corresponding one-half of a warrant, which is the midpoint of the estimated price range, as set forth on the cover page of this prospectus, before deducting estimated distribution commissions and offering expenses and warrants to be issued to our distributors as part of their commission payable by us:


	Total consideration										Weighted average price per share
	Number		Percent			Amount		Percent			Weighted average price per share
	(in thousands)
Existing shareholders before this offering		23,994,904		81	%		121,039		67	%		5.04
Investors participating in this offering		5,625,000		19	%		60,937		33	%		10.80
Total		29,619,904		100	%		181,976		100	%		—

The number of shares of common stock outstanding in the table above is based on the pro forma number of shares outstanding as of December 31, 2010.

Effective upon the closing of this offering, an aggregate of 1,296,289 shares of our common stock will be reserved for future issuance under our 2007 Equity Incentive Plan and 2010 Employee Stock Purchase Plan. To the extent that any options or warrants are exercised or new options or shares are issued under our benefit plans or we issue additional shares of common stock in the future, there will be further dilution to investors participating in this offering.

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SELECTED FINANCIAL DATA

The following selected financial data should be read together with our financial statements and accompanying notes and “Management’s Discussion and Analysis of Financial Condition and Results of Operations” appearing elsewhere in this prospectus.

We derived the statements of operations data for the years ended December 31, 2008, 2009 and 2010 and the balance sheet data as of December 31, 2009 and 2010 from our audited financial statements appearing elsewhere in this prospectus. The statement of operations data for the years ended December 31, 2006 and 2007 and the balance sheet data as of December 31, 2006, 2007 and 2008 are derived from our audited financial statements, which are not included in this prospectus.

Our historical results are not necessarily indicative of our future results.


	Years ended December 31,
	2006			2007			2008			2009			2010

Statements of Operations Data:
Revenues	$	4,252		$	27,878		$	17,276		$	2,655		$	5,201
Cost of development services		—			—			1,719			1,712			1,200
Gross profit		4,252			27,878			15,557			943			4,001
Operating costs and expenses:
Research and development		18,881			20,774			18,726			15,744			18,682
General and administrative		2,986			7,055			5,018			5,087			6,340
Total operating costs and expenses		21,867			27,829			23,744			20,831			25,022
Operating income (loss)		(17,615	)		49			(8,187	)		(19,888	)		(21,021	)
Financial income (expenses), net		656			940			722			87			(538	)
Income (loss) before income taxes		(16,959	)		989			(7,465	)		(19,801	)		(21,559	)
Income taxes		—			—			(1,667	)		160			(283	)
Net income (loss)		(16,959	)		989			(9,132	)		(19,641	)		(21,842	)
Changes of Redemption Value of Series F and H Preferred Stock		638			(336	)		—			—			(468	)
Deemed dividend as a result of warrants modification		—			(117	)		—			—			—
Income attributable to preferred shareholders		—			536			—			—			—
Net income (loss) to common shareholders	$	(16,321	)		—			(9,132	)		(19,641	)		(22,231	)
Net income (loss) per share of common stock:
Basic and diluted net loss per share	$	(6.21	)		—		$	(2.76	)	$	(5.80	)	$	(6.58	)
Weighted average number of shares used in computing basic and diluted net loss per share		2,628,784			2,970,351			3,307,871			3,388,119			3,388,530
Proforma net loss per share of common stock:
Basic and diluted net loss per share pro forma (unaudited)														(1.07	)
Weighted average number of shares used in computing basic and diluted net loss per share pro forma (unaudited)														20,394,767

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	As of December 31,
	2006		2007		2008		2009			2010
	(in thousands)
Balance Sheet Data:
Cash and cash equivalents	$	19,842	$	12,234	$	32,734	$	12,842		$	13,887
Working capital		4,637		8,611		27,412		8,792			5,856
Total assets		22,892		16,105		36,374		15,690			17,571
Deferred revenues		11,677		698		16		81			9,920
Redeemable convertible preferred stock		236		0		27,000		27,000			38,500
Total shareholders’ equity (deficiency)		5,410		9,391		1,576		(17,132	)		(37,383	)

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MANAGEMENT’S DISCUSSION AND ANALYSIS
OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

The following discussion and analysis of our financial condition and results of operations should be read together with our financial statements and related notes appearing elsewhere in this prospectus. This discussion and analysis contains forward-looking statements that involve risks, uncertainties and assumptions. You should review the “Risk Factors” section of this prospectus for a discussion of important factors that could cause actual results to differ materially from the results described in or implied by the forward-looking statements described in the following discussion and analysis.

Overview

We are a clinical-stage pharmaceutical company engaged in discovering and developing novel RNA interference or RNAi-based therapeutics. We have a fully integrated drug development platform that spans therapeutic target identification based on our proprietary gene discovery science and technology, to clinical drug development. We initially focus on RNAi-based therapeutics for the treatment of diseases associated with oxidative stress and ischemic injury. We believe that our insight into the molecular mechanisms underlying these diseases, combined with our ability to design, chemically modify and successfully deliver synthetic small-interfering RNA, or siRNA, to specific organs in the body, enables us to rapidly develop drug candidates, often directed against the same target across multiple therapeutic areas. We have three product candidates in clinical development in five different indications: PF-655 (also called PF-04523655 and previously RTP801i-14) for the treatment of diabetic macular edema or DME and for wet age-related macular degeneration, or wet AMD; QPI-1002 (previously AKIi-5) for the prevention of acute kidney injury, or AKI (known also as acute renal failure or ARF) and for prevention of delayed graft function or DGF in kidney transplant patients; and QPI-1007 for ocular neuroprotection. We have licensed PF-655 to Pfizer on an exclusive worldwide basis and we granted an option for an exclusive license to QPI-1002 to Novartis. In March 2011, we received the results of the Phase II DEGAS trial of PF-655 for diabetic macular edema, which demonstrated that the drug was well tolerated, with no observed drug related serious adverse events, and showed a dose dependent improvement in visual acuity over the standard of care. We have a broad pipeline based on our internally developed and chemically modified siRNA structures, protected by intellectual property rights. Several of our product candidates are based on novel targets and therapeutic concepts discovered using our BiFAR^TM target gene discovery platform. We believe that our platform technologies, siRNA capabilities and intellectual property combined with expertise of our regulatory, medical, preclinical and clinical development group will enable us to continue to advance new product candidates into clinical development

We have incurred significant net losses since our inception in December 1993. From inception through December 31, 2010, we have funded our operations primarily through gross proceeds of $121.5 million from the sale of equity securities and $140 million pursuant to our license and collaboration agreements with pharmaceutical companies. Through 2005, a substantial portion of our revenues were from our BiFAR^TM gene discovery collaboration agreements with several pharmaceutical companies. In connection with the expiration of research funding under some of those agreements, we ceased certain of our product development efforts. In September 2006, we licensed our drug candidates that inhibit RTP-801 to Pfizer. In March 2011 we entered into an amendment to our license agreement with Pfizer pursuant to which we will conduct a Phase IIb clinical trial in diabetic macular edema at our sole expense in consideration for increased milestone payments and royalties if Pfizer elects to continue its development of PF-655 after its review of the Phase IIb clinical data. In June 2010 we entered into a collaboration and license agreement with Nitto Denko pursuant to which Nitto Denko will fund certain of our research program efforts. In August 2010 we granted an option to Novartis for an exclusive license on our QPI-1002 drug candidate for all indications and we recognized a non-refundable option grant fee. We may seek to license our other product candidates to third parties in the future. For the next several years, we expect that our revenues will consist primarily of payments from Pfizer, Novartis if the option is exercised, Nitto Denko and any future licensees and collaborators. We have not achieved profitability and we expect to incur significant net losses over the next several years as we expand our research and development activities, advance our product candidates into later stages of clinical development, and expend resources on collaborations and other general corporate activities.

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Financial Operations Overview

The following is a description of components of our revenue and operating expenses.

Revenues. We generate revenues mainly from research and development services under our collaborations with pharmaceutical companies, from research and development cost reimbursements and up-front and milestone payments under other collaboration and license agreements and to a lesser extent from certain short-term research service agreements and grants.

Revenues under Pfizer agreement

During 2008, we recognized revenues revenue under the Pfizer agreement in the total amount of $17.2 million, of which $12.9 million was a milestone payment following the achievement of the second clinical development milestone for our siRNA drug PF-655 in development for the treatment of ocular diseases. A portion of the milestone payment from Pfizer is payable by us to Silence Therapeutics (formerly; Atugen AG) and Alnylam as technology license milestone payments, $1.9 million and $0.4 million, respectively, both of which were recorded by us as research and development expenses. In addition, during the year ended December 31, 2008, $0.7 million was recorded as a result of amortization of deferred revenues and $3.7 million was recorded as revenues from reimbursement of on-going research and development expenses related to the agreement with Pfizer.

During the years ended December 31, 2009 and 2010, we recognized total revenue under the Pfizer agreement of $2.6 million and $1.9 million, respectively from research and development services.

Revenues under Novartis agreement

We recognize revenue from the $10 million non-refundable up-front option payment on a straight-line basis over the estimated term of performance under the agreement, which is, at maximum, the completion of Phase II for the two therapeutic indications that are mentioned in the agreement. Since August 2010, the option under the agreement is in effect and we have started performing the development activity. During the year ended December 31, 2010, we recognized revenue of $1,193 related to this arrangement. As of December 31, 2010, $ 8,807 was recorded as deferred revenue.

Cost of revenues. Cost of revenues include direct and allocated expenses that are associated with the clinical development-related services provided to Pfizer.

Research and Development Expenses. The majority of our operating expenses to date have been for research and development activities. Costs associated with our research activities and product development efforts mainly include the following:

•

costs for conducting preclinical studies, clinical trials, and manufacturing by outsourced vendors and clinical research organizations;

•

employee and consultant-related expenses, which include salaries and benefits;

•

license fees paid to third parties for rights to their intellectual property; and

•

direct and indirect expenses required for operation and maintenance of labs and research and development offices, such as supplies and material, rent, utilities, depreciation and other expenses,

At any given time, we have multiple ongoing research and development projects. Our internal resources, employees and infrastructure are not directly tied to any individual project and are typically deployed across multiple projects. We group projects into two major categories: “research” and “preclinical and clinical development.” Through our clinical development programs we are developing each of our product candidates in parallel for multiple disease indications, and through our basic research activities are seeking to design potential drug candidates for multiple new disease indications. We have not therefore maintained complete cost information for each of our projects.

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We only commence tracking cost by project when we begin preclinical studies with respect to a particular product candidate and we start development, rather than keeping cost information from the onset of each project. The approximate costs associated with our (a) basic research programs and (b) preclinical and clinical development activities were as follows:


	Cost from proof of concept through December 31, 2010			Year ended December 31,
				2008		2009		2010
	(in thousands)
Pre-clinical and clinical development
PF-655*		16,773	⁽²⁾		3,256		14		14
QPI-1002 for AKI		17,740	⁽²⁾		2,592		2,624		2,128
QPI-1002 for DGF		12,356			1,961		3,922		6,473
QPI-1007		8,334			750		3,709		3,875
Other					578		98		—
Total pre-clinical and clinical development					9,137		10,367		12,490
Research⁽¹⁾					9,589		5,377		6,192
Total research and development				$	18,726	$	15,744	$	18,682

The product was licensed to Pfizer in September 2006 and development activities have been funded by Pfizer since then, except for certain expenses that were only partly reimbursed by Pfizer according to our agreement with Pfizer.

(1)

Research constitutes research costs for our early stage programs and technology development.

(2)

Starting from the end of 2006.

Research and development expenses, including those paid to third parties, are expensed as incurred. We expect our research and development expenses to increase in the future as we continue to develop our product candidates and advance new product candidates into clinical development.

The majority of our research and development programs are at an early stage and may not result in any approved products. Phase I clinical trials generally are expected to last between 12 and 18 months, Phase II clinical trials are expected to last between 18 and 24 months and Phase III clinical trials are expected to last between 24 and 42 months. The length of clinical development depends on the specific disease, patient population, time required for recruitment of patients and other factors. For product candidates that are in preclinical development, the timing of an IND filing varies significantly and is difficult to predict. Product candidates that may appear promising at early stages of development may not reach the market for a variety of reasons. Product candidates may be found to be ineffective or to cause harmful side effects during clinical trials, may take longer to advance through clinical trials than had been anticipated, may fail to receive necessary regulatory approvals and may prove impracticable to manufacture in commercial quantities at reasonable cost and with acceptable quality. As part of our business strategy we may enter into new license and collaboration agreements with third parties to complete the development and commercialization of our product candidates and it is uncertain which of our product candidates, if any, may be subject to future license and collaboration agreements. The participation of a licensee or collaborator may accelerate the time to completion and reduce the cost to us of a product candidate or it may delay the time to completion and increase the cost to us due to the alteration of our existing strategy.

As a result of the uncertainties discussed above and those associated with clinical trial enrollment, as well as the risks inherent in the drug development process, we are unable to estimate with any certainty the duration and costs of future clinical trials or, if not already substantially underway, current clinical trials of our product candidates or when, or to what extent, we will generate revenue or receive royalties from the commercialization and sale of any of our product candidates. Any failure or delay in completing clinical trials, or in obtaining regulatory approvals, would cause our research and development expenses to increase and, in turn, have a material adverse effect on our results of operations.

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General and Administrative Expenses. General and administrative expenses consist principally of salaries and related costs for personnel in executive, finance, accounting, business development, information technology, legal and human resources functions. Other general and administrative expenses include facility costs not otherwise included in research and development expenses, patent related costs and professional fees for legal, consulting and accounting services.

Critical Accounting Policies and Significant Judgments and Estimates

Our management’s discussion and analysis of our financial condition and results of operations are based on our financial statements, which have been prepared in accordance with accounting principles generally accepted in the United States. The preparation of these financial statements requires us to make estimates and judgments that affect the reported amounts of assets and liabilities and the disclosure of contingent assets and liabilities at the date of the financial statements, as well as reported revenues and expenses during the reporting periods. We base our estimates on historical experience and on various other factors that we believe are reasonable under the circumstances. The SEC considers an accounting policy to be critical if it is important to a company’s financial condition and results of operations, and if it requires the exercise of significant judgment and the use of estimates on the part of management in its application. We have discussed the selection and development of the critical accounting policies with the audit committee of our board of directors, and the audit committee has reviewed our related disclosures in this prospectus. Although we believe that our judgments and estimates are appropriate, actual results may differ from those estimates.

We believe the following to be our critical accounting policies because they are both important to the portrayal of our financial condition and results of operations and they require critical management judgment and estimates about matters that are uncertain:

•

revenue recognition;

•

accruals, — mainly for research and development expenses for activities performed by third parties;

•

stock-based compensation;

•

fair value of equity instruments and derivatives and

•

income taxes.

If actual results or events differ materially from those contemplated by us in making these estimates, our reported financial condition and results of operations for future periods could be materially affected. See “Risk Factors” for certain matters that may affect our future results of operations or financial condition.

Revenue Recognition

Our revenue recognition policies are in accordance with the Securities and Exchange Commission’s (“SEC”) Staff Accounting Bulletin No. 104, “Revenue Recognition” (“SAB 104”) and Accounting Standards Codification No. 605-25, “Revenue Arrangements with Multiple Deliverables” (“ASC 605-25”) and Accounting Standards Codification No. 605-45, “Reporting Revenue Gross Versus Net As an Agent” (“ASC 605-45”).

License Agreements

Our multiple element arrangements were analyzed to determine whether the deliverables, which include a license (or option to license) and performance obligations such as research and steering committee services, can be separated or whether they must be accounted for as a single unit of accounting in accordance with ASC 605-25. According to ASC 605-25 we considered if (i) the license has stand-alone value and (ii) whether a fair value of any of the undelivered performance obligations can be determined. Because we could not determine fair value of the undelivered performance obligations the arrangement is being accounted for as a single unit of accounting and the upfront front payments are recognized as revenue over the estimated period of when the performance obligations are performed. In addition, revenues are recognized only when we have a contractual right to receive payments, the contract price is fixed or determinable and the collection of the resulting receivable is reasonably assured.

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Whenever we determine that an arrangement should be accounted for as a single unit of accounting, it must determine the period over which the performance obligations will be performed and revenue will be recognized.

As we can reasonably estimate when the performance obligations cease or become inconsequential and the performance obligations are provided on a best-efforts basis, the total payments under the arrangement, excluding royalties and payments contingent upon achievement of substantive milestones, are recognized as revenue on a straight-line basis over the period we expect to complete its performance obligations.

Significant management judgment is required in determining the period over which we expect to complete its performance obligations under the arrangement. In addition, as the Company is involved in joint steering and research committees as part of this multiple element arrangement that is accounted for as a single unit of accounting, we assess whether its involvement constitutes a performance obligation or a right to participate. Whenever the Company can be released from the joint steering and research committees anytime upon request and without penalty, such services are considered inconsequential or perfunctory and are not considered to be performance obligations.

As stated above, when a multiple element arrangement is included in a license option, we determined that the option and remaining services should be accounted for as a single unit of accounting. Consequently, we will recognize exercise payment over the remaining service period. Whereas the option can be exercised, the remaining performance obligation was not completed based on the estimated period of service.

Our collaboration agreements with Pfizer and Novartis also contain milestone payments. During the period in which the Company has research performance obligations, milestone payments are considered to be substantive. Substantive milestone payments are considered to be performance bonuses that are recognized upon achievement of the milestone only if all of the following conditions are met:

•

The consideration is commensurate with either (1) the entity’s performance to achieve the milestone, or (2) the enhancement to the value of the delivered item(s) as a result of a specific outcome resulting from the entity’s performance to achieve the milestone.

•

The consideration relates solely to past performance.

•

The consideration is reasonable relative to all of the deliverables and payment terms (including other potential milestone consideration) within the arrangement.

Reimbursement of costs is recognized as revenue on a gross basis as costs are being incurred in accordance with the provisions of ASC 605-45 provided the amounts are determinable, and collection of the related receivable is reasonably assured.

Development services

In 2008, we amended our agreement with Pfizer and started to generate revenue by providing professional services and assistance to Pfizer on a time-and-materials basis. Under the agreement terms, we are paid for services provided by company personnel based on per employee rates and actual hours the employee contributed towards Pfizer projects as well as for costs paid by us to third parties in performing the service.

Revenue is recognized as services are performed, provided that evidence of an arrangement has been obtained, fees are fixed and determinable and collectability is reasonably assured.

Research Collaborations with Pharmaceutical Companies

Under these agreements, our performance obligations were provided on a best-efforts basis. The total payments under each arrangement, excluding royalties and payments contingent upon achievement of development milestones by our collaborators, were recognized as revenue on a straight-line basis over the periods in which we completed our performance obligations. Revenue was limited to the lower of the cumulative amount of payments received or the cumulative amount of revenue earned, as determined using the straight-line basis, as of the period ending dates.

We have no further performance obligations and are not involved in our collaborators’ research and development plans. We may be entitled to future milestone payments and royalties from our collaborators,

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depending on the progress of development of a drug candidate. Revenue from such milestone payments and royalties will be recognized when due and collection is reasonably assured.

Other short term service agreements:

Under certain short term fixed-price service contracts, we agree to perform limited research services using its technology and research platforms for a fixed price. Under these agreements, revenue is deferred until the Company completes its milestone performance obligations.

Deferred revenue:

Deferred revenue is recognized for payments received in advance of the culmination of the earnings process. Deferred revenue that is expected to be recognized within the next twelve months is presented as part of the current liabilities. Deferred revenue that is expected to be recognized beyond the next twelve months is presented as part of long term liabilities.

Accrued Research and Development Costs

We estimate our accrued research and development costs based on our estimates of the services received pursuant to contracts with multiple research institutions and clinical research organizations that conduct and manage preclinical studies, clinical trials and other research activities on our behalf. The financial terms of these agreements vary from contract to contract and may result in uneven payment flows. Accrued research and development costs include accruals for the following:

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contract research organizations in connection with preclinical studies;

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contract research organizations and other clinical sites in connection with clinical trials; and

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contract manufacturers in connection with the production of components and drug materials for preclinical studies and clinical trials.

We record accruals for these research and development contracts based upon progression and percentage of completion of work done. Determination of progress of each contract is based on reports and deliverables but also on estimates such as time for completion and others. All such costs are included in research and development expenses. Costs of setting up a preclinical study or clinical trial are expensed immediately. Costs related to patient enrollment in clinical trials are rerecorded and accrued for as patients are enrolled in the trial.

Stock-Based Compensation

We account for stock-based compensation in accordance with Accounting Standards Codification No. 718-10, “Compensation — Stock Compensation” (“ASC 718-10”). ASC 718-10 requires companies to estimate the fair value of equity-based payment awards on the date of grant using an option-pricing model. The value of the portion of the award that is ultimately expected to vest is recognized as an expense over the requisite service periods in the Company’s consolidated income statements.

We recognize compensation costs net of a forfeiture rate for only those shares expected to vest on straight-line basis over the requisite service period of the award, which is generally the option vesting term of four years. ASC 718-10 requires forfeitures to be estimated at the time of grant and revised, if necessary, in subsequent periods if actual forfeitures differ from those estimates.

We selected the Black-Scholes option pricing model as the most appropriate fair value method for its stock-options awards. The option-pricing model requires a number of assumptions, of which the most significant are the expected stock price volatility and the expected option term.

The computation of expected volatility is based on realized historical stock price volatility of competitive Companies. The interest rate for period within the contractual life of the award is based on the U.S. Treasury yield curve in effect at the time of grant. The Company has historically not paid dividends and has no foreseeable plans to pay dividends. The expected term is calculated based on the “simplified method” as defined in Staff Accounting Bulletin No. 107 or SAB 107, “Share Based Payments” and Staff Accounting Bulletin No. 110, or SAB 110, as the average between the vesting period and the contractual life of the

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options. The Company adopted SAB 110 effective January 1, 2008 and will continue to apply the simplified method until sufficient historical experience is available to provide a reasonable estimate of the expected term for stock option grants.

Stock-based compensation expense includes the fair value of each option to purchase shares of our common stock on the date of grant and is amortized over the vesting period of the underlying option, generally four years using the straight-line method. As further discussed in fair value of equity instruments and derivatives section below there are significant judgments and estimates inherent in the determination of the reassessed fair values.

For non-employees, stock-based compensation expense is recognized over the period of expected service by the non-employee. As the service is performed, we are required to update these assumptions and periodically revalue unvested options and make adjustments to the stock-based compensation expense using the new valuation. These adjustments may result in higher or lower stock-based compensation expense in the statement of operations than originally estimated or recorded. Ultimately, the final compensation charge for each option grant to non-employees is unknown until those options have vested or services have been completed.

Fair value of our common stock

The fair value of the common stock underlying stock options granted during the periods presented were estimated by our board of directors with input from management based upon several factors, including progress and milestones attained in our business. In the absence of a public trading market for our common stock, our board of directors was required to estimate the fair value of our common stock. Our board of directors considered numerous objective and subjective factors in determining the fair value of our common stock at each option grant date, including the factors described below:

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the common stock underlying the option involved illiquid securities in a private company;

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prices of our Series A, Series B, Series C, Series D, Series E, Series F, Series G and Series H preferred stock issued by us primarily to outside investors in arm’s-length transactions, and the rights, preferences and privileges of the preferred stock relative to the common stock

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our performance and the status of research and product development efforts;

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developments concerning our collaborations;

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the composition of and additions to the management team;

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our stage of development and business strategy, including our regulatory review status with regulatory authorities; and

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the likelihood of achieving a liquidity event for the shares of common stock underlying these stock options, such as an initial public offering, merger or sale of us, given prevailing market conditions.

In connection with the preparation of the financial statements necessary for the filing of our initial public offering, we have reassessed the fair value of our common stock at option grant dates since 2009 to the present. We did not use a contemporaneous valuation from an unrelated valuation specialist at the time of the option grants during 2009, because we believed our board of directors’ estimates of the fair value of our common stock to be reasonable and consistent with our understanding of how similarly situated companies in the biotechnology industry were valued. In addition, management’s efforts at the time were focused on product development and the financial and managerial resources available to support an unrelated party valuation were limited.

Significant Factors, Assumptions and Methodologies Used in Determining Fair Value

Our board of directors determined the estimated fair value of our common stock on the date of grant based on several factors, including the price at which Series H preferred stock was issued by us to outside investors in arms-length transactions in 2008 and 2010, and the rights, preferences and privileges of the preferred stock relative to the common stock, important developments relating to advancement of our technology and clinical programs, our stage of development and business strategy, the likelihood of achieving a liquidity event for the shares of common stock, such as an initial public offering or sale of our company,

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given prevailing market conditions, and the market prices of various publicly held life science companies and the level of broad based life science stock indices.

As part of our preparation for our initial public offering during the second quarter of 2010, and in accordance with the valuation approaches set forth in the American Institute of Certified Public Accountants, or AICPA, Practice Aid, Valuation of Privately-Held Company Equity Securities Issued as Compensation, our board of directors reassessed, retrospectively, the fair value of our common stock in 2009. In reassessing the fair value of our common stock, we considered numerous objective and subjective factors, including:

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a third-party independent valuation report prepared by Variance Economic Consulting, Ltd;

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the pricing of private sales of our preferred shares;

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the comparative rights and preferences of our ordinary shares and our preferred shares;

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the progression of our research and product development efforts;

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significant changes, events and milestones in our business development, including the entry into significant license agreements and collaboration arrangements;

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the likelihood of an initial public offering; and

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the market prices and multiples of comparable publicly held biotech companies.

The retrospective analysis utilized the following methods outlined in the AICPA Practice Aid:

Discounted Future Cash Flow Method (DCF). To reach enterprise value as of September 30, 2009, and September 1, 2010 we performed a valuation using DCF methodology at each valuation date. Under the DCF method, the fair value of the business is estimated based on the stream of benefits investors expect to receive, the timing of such benefits and the risk borne by investors.

Option Pricing Model. Once the enterprise value was estimated pursuant to the foregoing analyses, the value was allocated among the company’s debt and its various classes of equity based on the characteristics of each such class and its claim on the company’s assets. Stock characteristics that were factored into the analyses included liquidation preferences, participation features, convertibility features and value sharing between classes of stock. Because the proceeds of any liquidation event are to be divided among the holders of our preferred stock prior to any distribution to the holders of our common stock, we determined that the shares of common stock have the nature of a stock option, which has a positive value only when our liquidation value exceeds the liquidation preference of our preferred stock. Accordingly, an option pricing model was used to estimate the value of our common stock. The common stock value was derived from the value for the company based upon the DCF method at the valuation date. This approach also took into account the relative seniority, rights, liquidation preferences and conversion ratios of the convertible preferred securities, common stock and warrants as of the valuation date under scenarios of both liquidation and initial public offering.

Based on the foregoing, we determined that the fair value of our common stock in September 2009 was $1.10 per share. The fair market value of our common stock was estimated using the option pricing method utilizing the binomial model described above, with the following assumptions for September 30, 2009: a risk-free interest rate of 0.40% – 0.95%, dividend yield of 0%, volatility of the expected market value of our total invested capital of approximately 75% and an expected term of 2.3 years.

Between September 30, 2009 and August 31, 2010, we did not grant any stock options. The valuation analysis of our common stock as of September 1, 2010 utilized the DCF methodology and was also based on estimates provided by underwriters utilizing the market prices. The factors considered in the valuation of our common stock included a third party independent valuation report prepared by Variance Economic Consulting, Ltd. In this report, the fair market value of our common stock was estimated using the option pricing model describing above, with the following assumptions for August 30, 2010: a risk-free interest rate of 0.25% – 0.5%, dividend yield of 0%, volatility of the expected market value of our total invested capital of approximately 75% and an expected term of 1.3 years.

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In our valuation, we considered both the possibility of a successful initial public offering and the possibility that a public offering would not be accomplished. Based on the expected probability of the occurrence of the initial public offering and the non- initial public offering scenarios, the fair value of our common stock was determined. As of September 1, 2010 we estimated a 40% likelihood of a successful initial public offering.

The most significant factors contributing to the increased value of our common stock between September 2009 and September 2010 were our entry into an option license agreement in August 2010 with Novartis and the progress in the development of our product candidates. During this period we filed and received FDA approval for an IND of QPI-1007 and started the Phase I trial for this product. Our partner Pfizer, in collaboration with us, completed the enrollment of the Phase II clinical trials of our product candidate for PF-655, for both age related macular degeneration and diabetic macular edema indications. We completed enrollment of the two phase I studies with QPI-1002, for acute kidney injury and delayed graft function. Finally, we started the Phase II clinical trials of our product candidate for QPI-1002 for delayed graft function in kidney transplant patients.

Based on the above, our board of directors determined the fair value of our common stock to be $4.55 per share on September 1, 2010, of which $2.56 was attributable to the successful initial public offering scenario as of that date.

While the midpoint of the currently estimated range of the initial public offering price set forth on the cover page is greater than the most recent value of common stock determined by our Board of Directors as of September 1, 2010, there are several factors noted below that explain this difference.

Since September 2010, we have continued to make progress in our Phase II and Phase I clinical trials. We received the results of the Phase II DEGAS trial of our PF-655 for diabetic macular edema, licensed to Pfizer. The results demonstrated that the drug was well tolerated, with no observed drug related serious adverse events, and showed a dose dependent improvement in visual acuity over the standard of care. Based on the results it was decided to conduct a Phase IIb study to determine the optimal dosing for Phase III. We amended our agreement with Pfizer so that we will conduct the Phase IIb clinical trial in diabetic macular edema at higher doses at our expense in consideration for increased milestone payments and increased royalties. Furthermore, we continued patient dosing in the Phase II clinical trial of our QPI-1002 for delayed graft function and advanced the initiation of the Phase II clinical trial of QPI-1002 in acute kidney injury. We completed Stratum 1, the safety part of our Phase I trial of QPI-1007 without dose-limiting toxicities observed up to the highest dose level tested and currently we are conducting Stratum 2 part of the study of Phase I, which may give early indication of the biological activity of QPI-1007 in non arteritic anterior ischemic optic neuropathy patients.

Moreover, our outlook regarding the fair market value of our common stock under the initial public offering scenario improved considerably. In July 2010 we held our “organizational meeting” for our initial public offering; in September 2010 we filed the first draft of our registration statement of which this prospectus is a part; since then we progressed considerably and we believe we have come close to concluding the review process with U.S. and Israeli regulatory authorities. This suggested that an initial public offering was becoming more likely, which would result in liquidity for the common stock and elimination of the superior rights and preferences of the preferred stock. This positively affected assumptions of the expected type, timing and likelihood of possible liquidity scenarios. The estimated initial public offering price range necessarily assumes that the initial public offering has occurred, a public market for our common stock has been created and that our preferred stock has converted into common stock in connection with the initial public offering, and therefore excludes any marketability or illiquidity discount for our common stock and excludes the superior rights and preferences of our preferred stock, which were appropriately taken into account in the Board’s fair market value determination in September 2010.

We believe however that in light of these factors increasing the value of our stock, the composition of our board of directors and discussions with underwriters that took into account perceptions of the market for initial public offerings resulted in a fair and reasonable view of the stock value. Nevertheless, as stated above, determining the fair value of our common stock requires making complex and subjective judgments. The approach to valuation uses estimations, which are consistent with the plans, and estimates that we use to

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manage our business. There is inherent uncertainty in making these estimates. Although it is reasonable to expect that the completion of our initial public offering will add value to our common stock because it will have increased liquidity and marketability, the amount of additional value cannot be measured with absolute precision or certainty.

We have not granted any stock options following September 1, 2010.

Aggregate Intrinsic Value of Outstanding Stock Options

Based upon an assumed initial public offering price of $10.00 per share and one-half of a warrant comprising each unit which is the midpoint of the estimated price range, as set forth on the cover page of this prospectus, the aggregate intrinsic value of outstanding stock options vested and unvested as of December 31, 2010 was $21.43 million, of which $12.35 million related to vested stock options and $9.08 million related to unvested stock options expected to vest.


	December 31, 2010		Weighted Average Exercise Price		Assumed IPO Price		Aggregate Intrinsic Value
Vested		1,518,345	$	2.01	$	10.00	$	12,350
Unvested		1,100,279		1.75		10.00		9,077
Total outstanding		2,618,624		1.90		10.00	$	21,427

The assumed IPO price does not take into consideration the effective price of a share comprising each unit.

Preferred Stock Warrant Liability

We account for our preferred stock warrant in accordance with Accounting Standards Codification 480-10, “Distinguishing Liabilities from Equity” (“ASC 480-10”), which requires that a financial instrument, other than an outstanding share, that, at inception, is indexed to an obligation to repurchase the issuer’s equity shares, regardless of the timing or likelihood of the redemption shall be classified as a liability. We measure the fair value of our warrant liability using an option-pricing model with changes in fair value recognized in earnings. Any modifications to the warrant liability are recorded in earnings during the period of the modification.

The significant assumptions used in estimating the fair value of our warrant liability include the strike price, estimate for volatility, risk free interest rate, estimated fair value of the preferred stock, and the estimated life of the warrant. Changes to these assumptions impact the value of the liability.

On October 18, 2010, the warrants were exercised for 300,000 shares of our series H Redeemable Preferred stock, in consideration of $1.5 million.

Income taxes

We are required to calculate and account for income taxes in each jurisdiction in which we operate. This involves estimating the current tax exposure in each jurisdiction as well as making judgments regarding the recoverability of deferred tax assets. Our estimates regarding the valuation allowance for deferred tax assets require that we make significant estimates and judgments regarding our future operating results. Our ability to realize deferred tax assets depends on our future taxable income as well as limitations on their utilization. A deferred tax asset is reduced by a valuation allowance if it is more likely than not that some portion or all of the deferred tax asset will not be realized. The projections of our operating results on which the establishment of a valuation allowance are based involve significant estimates regarding future demand for our products, competitive conditions, product development efforts, approvals of regulatory agencies and product costs. If actual results differ from these projections, or if our expectations of future results change, it may be necessary for us to adjust the valuation allowance. Although we believe that our estimates and judgments about the tax contingencies and valuation allowance are reasonable, actual results could differ, and we may be exposed to income tax expenses that could be material.

We account for income taxes in accordance with ASC 740-10, “Income Taxes” (“ASC 740-10”). ASC 740 prescribes the use of the liability method whereby deferred tax asset and liability account balances

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are determined based on differences between the financial reporting and tax bases of assets and liabilities and are measured using the enacted tax rates and laws that will be in effect when the differences are expected to reverse. The Company provides a valuation allowance, to reduce deferred tax assets to their estimated realizable value.

Accounting for tax positions requires judgments, including estimating reserves for potential uncertainties. We also assess our ability to utilize tax attributes, including those in the form of carry forwards for which the benefits have already been reflected in the financial statements. While we believe the resulting tax balances as of December 31, 2009 and 2008 are appropriately accounted for, the ultimate outcome of such matters could result in favorable or unfavorable adjustments to our consolidated financial statements and such adjustments could be material. We have filed or are in the process of filing local and foreign tax returns that are subject to audit by the respective tax authorities. We believe that we adequately provided for any reasonably foreseeable outcomes related to tax audits and settlement. However, our future results may include favorable or unfavorable adjustments to our estimated tax liabilities in the period the assessments are made or resolved, audits are closed or when statutes of limitation on potential assessments expire.

Results of Operations

Comparison of Years Ended December 31, 2009 and December 31, 2010

Revenue. Revenue increased to $5.2 million for the year ended December 31, 2010 from $2.7 million for the year ended December 31, 2009. The revenue for these periods derived from services provided to Pfizer as described above and in the year ended December 31, 2010, the revenue also included $1.4 million from our agreement with Nitto Denko, $1.2 million from our agreement with Novartis and grant of $0.7 million from the United States Department of Treasury.

Cost of development services. Cost of development decreased from $1.7 million for the year ended December 31, 2009 to $1.2 million for the year ended December 31, 2010. The decrease results mainly from the completion of the enrollment of patients to Phase II of PF-655 in 2010.

Research and Development Expenses. Research and development expenses increased to $18.6 million for the year ended December 31, 2010, compared to $15.7 million for the year ended December 31, 2009. This was primarily due to an increase in the amount of $1.5 million in license expenses we paid to Atugen and Dharmacon in 2010 and expenses in the amount of $1.1 million we paid for our clinical trials related to DGF and NAION.

General and Administrative Expenses. General and administrative expenses increased to $6.3 million for the year ended December 31, 2010, compared to $5.0 million for the year ended December 31, 2009. This increase resulted primarily from an increase of $0.35 million in Patent fees, $0.4 million in professional services expenses due to new agreement of Novartis and Nitto Denko. $0.5 million in payroll and related expenses mainly resulted from a waiver of a loan we made to our CEO.

Net Financial Income. Net financial expenses increased to $538,000 for the year ended December 31, 2010, from financial income of $87,000 for the year ended December 31, 2009. This is mainly due to an increase in net financial expenses of $565,000 as a result of a change in the fair value of warrants to purchase Series H Redeemable Convertible Preferred Stock.

Comparison of Years Ended December 31, 2008 and 2009

Revenue. Revenue decreased from $17.3 million in 2008 to $2.6 million in 2009. This decrease of $14.6 million was primarily due to $12.9 million in revenue recognized in 2008 in connection with a Phase II milestone payment under our agreement with Pfizer, with no corresponding milestone payment recognition in 2009.

Cost of development services. Cost of development services was $1.7 million in each of the years 2008 and 2009.

Research and Development Expenses. Research and development expenses decreased from $18.7 million in 2008 to $15.8 million in 2009. This decrease of $2.9 million was primarily due to $2.3 million in license expenses we paid as royalties to Atugen and Alnylam in 2008, with no corresponding payment in 2009.

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General and Administrative Expenses. General and administrative expenses were $5.0 million in each of 2008 and 2009, with no material changes.

Net Financial Income. Net financial income decreased from $722,000 in 2008 to $87,000 in 2009. This decrease was primarily due to a decrease in our cash balances in 2009 compared to 2008, as well as decreased interest yields on cash and short-term investments.

Income taxes. Tax expenses changed from $1.6 million tax expenses in 2008 to $160,000 tax income in 2009. The tax expenses in 2008 resulted mainly from accruals due to our tax position.

Liquidity and Capital Resources

Since inception through December 31, 2010, we have financed our operations primarily through private placements of equity securities, receiving aggregate net proceeds from such sales totaling $121.5 million and proceeds from collaboration, service and license agreements totaling $140 million. As of December 31, 2010, we had $13.9 million in cash and cash equivalents, as compared to $12.8 million and $32.7 million as of December 31, 2009 and 2008, respectively. Our cash and investment balances are held in bank deposits and money market funds.

As of December 31, 2010, we had cash and cash equivalents of $13.9 million. Net cash used for operating activities was $10.3 million for the year ended December 31, 2010, compared to $19.8 million net cash used in operating activities for the year ended December 31, 2009, a decrease of $9.5 million. The loss for the year ended December 31, 2010 was $21.8 million and the adjustment to cash was $11.5 million positive. The loss for the year ended December 31, 2009 was $19.6 million and the adjustment to cash was $0.2 million negative.

Net cash used in operating activities was $6.7 million, $19.8 million and $10.3 million in 2008, 2009 and 2010, respectively. The use of cash in each period resulted primarily from funding our efforts in research and development, personnel-related costs and obtaining licenses to intellectual property rights. The increase net cash used in 2009 resulted primarily from a substantial decrease in revenue. In 2010 our net cash used in operating activities was impacted by an increase in the deferred revenues due to our collaboration agreements. In 2009 there was no revenue from licenses, which required us to use more cash to support our operations. In addition an increase in tax accrual of $2.6 million, which was paid in monthly installments, impacted our net cash provided in operating activates in the year 2008.

Net cash used in investing activities was $397,000, $70,000 and $123,000 in 2008, 2009 and 2010, respectively. The net cash used in investing activities resulted primarily from purchase of equipment of $293,000, $70,000 and $140,000 in 2008, 2009 and 2010 respectively.

Net cash provided by financing activities was $27.6 million, $0 million and $11.5 million in 2008, 2009 and 2010 respectively. The net cash provided by financing activities resulted primarily from the sale of redeemable preferred stock and warrants to purchase redeemable preferred stock in the amounts of $27 million and $11.5 million in 2008 and 2010 respectively.

Based on our current operating plans, we estimate that our existing capital resources, funds to be received pursuant to our agreements with Novartis, Nitto Denko and Pfizer and the net proceeds from this offering, will be sufficient to fund the research and development plans up to meet our financial obligations through the first half of 2013. The Series H Redeemable Preferred stock will become redeemable at any time after August 31, 2011. On November 25, 2010 the holders of a majority of the Series H Redeemable Preferred stock agreed not to exercise their right of redemption prior to January 31, 2012. Consequently, according to the Company’s articles of incorporation, the holders of the Series H Redeemable Preferred stock will not redeem their shares before that date. The redemption right will terminate upon the closing of a qualified Initial Public Offering.

We will need to raise additional funds to support our operations, and such funding may not be available to us on acceptable terms, or at all. If we are unable to raise additional funds when needed, we may not be able to continue development of our product candidates or we could be required to delay, scale back or eliminate some or all of our development programs and other operations. For example, depending on how our clinical trials progress and whether we need to enroll additional patients, we may not be able to complete our

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Phase IIb clinical trial of PF-655 in diabetic macular edema, our Phase II clinical trials of QPI-1002 in delayed graft function or acute kidney injury and/or the Stratum 2 part of our Phase I clinical trial of QPI-1007 in non arteritic anterior ischemic optic neuropathy, unless we obtain additional funding. We may seek to raise additional funds through public or private financing, strategic partnerships or other arrangements. Any additional equity financing may be dilutive to shareholders and debt financing, if available, may involve restrictive covenants. If we raise funds through collaborative or licensing arrangements, we may be required to relinquish, on terms that are not favorable to us, rights to some of our technologies or product candidates that we would otherwise seek to develop or commercialize ourselves. Our failure to raise capital when needed may harm our business and operating results.

Contractual Obligations

Our future contractual obligations at December 31, 2010 were as follows:


	Total		<1 Year		1 – 3 Years		3 – 5 Years		Thereafter
Contractual Obligations	Payments due by period
	(in thousands)
Operating lease obligations⁽¹⁾	$	354		272	$	82	$	—	$	—
Total	$	354	$	272	$	82	$	—	$	—

(1)

Our office lease agreement of the Israeli subsidiary ended in June 13, 2010. We are currently negotiating the terms of the new agreement. Since June, 2010 until today we are continuing with the same terms as the previous agreement.

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The table above does not include obligations for accrued severance pay, which as of December 31, 2010 was $0.61 million which is fully covered by deposits for severance pay funds and insurance policies.

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The table above reflects only payment obligations that are fixed and determinable. We also have contractual payment obligations, the amount and timing of which are contingent upon future events. Significant contingent payments related to licensing and other arrangements not included in the contractual obligations table above are as follows:

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Under our December 2004 collaboration agreement with Silence Therapeutics, or Silence, and subsequent amendments, we are required to pay Silence a percentage in the mid teens range, of our receipts from Pfizer under our license agreement with Pfizer, including milestone and royalty payments, but excluding payments specifically committed to cover research and development costs. This percentage may be reduced if we are required to pay royalties to third parties for additional intellectual property. The timing and amount of these receipts from Pfizer, if any, and therefore the corresponding payments to Silence, are contingent on the achievement of milestone and other events and cannot be estimated with any certainty. Under our April 2005 option and license agreement with Silence, we exercised the option to license siRNA-structure related intellectual property for use in siRNA molecules targeting the p53 gene from Silence and we paid an option fee of €50,000 and an exercise fee of €500,000. We granted to Novartis an option to receive a sublicense under the Silence option and license agreement. Under our April 2005 option and license agreement with Silence, as amended, we are required to pay Silence a percentage in the low teens range of our payments from Novartis. We are also required to pay Silence certain lump-sum payments upon the achievement of certain events, the aggregate of which is below $1 million. To date, we have paid to Silence $6.9 million in option and exercise fees and development milestone payments.

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Under our September 2006 license agreements with Alnylam Pharmaceuticals, Alnylam granted us non-exclusive worldwide licenses under three families of patents and patent applications it owns or controls. The agreements provide for payment by us to Alnylam of annual maintenance fees and up to $6.5 million in contingent development and product approval milestone payments, which are not included in the above table. We will also be required under the license agreements to pay Alnylam low single digit royalties on any sales by us or our sublicensees. We granted Novartis an option for a sublicense under the patents and patent applications licensed to us under the p53 Alnylam agreement. We granted Pfizer a sublicense on the patents and patent applications licensed to us

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under the RTP-801 Alnylam agreement. Under the license agreement we entered into with Pfizer, Pfizer will partially reimburse our payments to Alnylam under the RTP-801 agreement. The amount and timing of these milestone and royalty payments, if any, are contingent, and cannot be estimated with any certainty.

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In September 1999, we entered into an exclusive worldwide license with the University of Illinois at Chicago related to the therapeutic inhibition of p53 and small molecule p53 inhibitors for all uses and indications. Under the agreement, we are required to pay the university a future royalty in the low single digit range based on our sales of products incorporating the licensed intellectual property, if any, or a percentage share in the low teens range of any sublicensing revenues, including milestones and royalties, if any, received from sublicensees. These payments to the University of Illinois at Chicago may be reduced in the event we are required to pay additional royalties to third parties for licenses of intellectual property required to develop, manufacture, or commercialize the licensed products. We are also required to pay the University of Illinois at Chicago certain lump-sum payments upon the achievement of certain events, the aggregate of which is below $1 million. These payments by us to the University of Illinois at Chicago, if any, are contingent and cannot be estimated with any certainty. To date, we have not granted any sublicense under our license from UIC, however we have granted Novartis an option for an exclusive sublicense on patents and patent applications under the UIC agreement through our option agreement with Novartis.

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In January 2010, Dharmacon, Inc., a wholly owned subsidiary of Thermo Fisher Scientific Inc. (“Dharmacon”), granted us an exclusive worldwide license under its patents and patent applications, related to specific siRNA molecule(s) and their use for the inhibition of p53, for all uses and indications. Under the agreement, we are required to pay up to $11.6 million milestone payments upon achievement of development and commercialization milestones as well as single digit royalties on future sales of licensed product. We are also required to pay a low single digit share of any payments we receive from sublicensees, including upfront and milestones payments but excluding royalties on sales by sublicensees and certain other payments. To date, we have not granted any sublicenses under our license from Dharmacon, but we have granted an option for an exclusive sublicense to Novartis thorough our option agreement with Novartis.

Off-Balance Sheet Arrangements

We do not have any off-balance sheet arrangements or relationships with unconsolidated entities or financial partnerships, such as entities often referred to as structured finance or special purpose entities.

Recent Accounting Pronouncements

In October 2009, the FASB issued an update to ASC Topic 605-25, “Revenue recognition — Multiple-Element Arrangements”, that provides amendments to the criteria for separating consideration in multiple-deliverable arrangements: (i) establishing a selling price hierarchy for determining the selling price of a deliverable. The selling price used for each deliverable will be based on vendor-specific objective evidence if available, third-party evidence if vendor-specific objective evidence is not available, or estimated selling price if neither vendor-specific objective evidence nor third-party evidence is available. A vendor will be required to determine its best estimate of selling price in a manner that is consistent with that used to determine the price to sell the deliverable on a standalone basis (2) eliminating the residual method of allocation — requires that arrangement consideration be allocated at the inception of the arrangement to all deliverables using the relative selling price method, which allocates any discount in the overall arrangement proportionally to each deliverable based on its relative selling price. (iii) Requiring expanded disclosures of qualitative and quantitative information regarding application of the multiple-deliverable revenue arrangement guidance. The mandatory adoption is on January 1, 2011. The Company may elect to adopt the provisions prospectively to new or materially modified arrangements beginning on the effective date or retrospectively for all periods presented. The Company does not expect the adoption will have material impact on its consolidated financial statements.

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In March 2010, the FASB issued an additional update to ASC 605 (ASU No. 2010-17, “Revenue Recognition — Milestone Method), which provides guidance related to revenue recognition that applies to arrangements with milestones relating to research or development deliverables. ASU 2010-17 provides criteria that must be met to recognize consideration that is contingent upon achievement of a substantive milestone in its entirety in the period in which the milestone is achieved. ASU 2010-17 is effective for interim and annual periods beginning after June 15, 2010. Early adoption is permitted. The Company will adopt ASU 2010-17 on August 1, 2010. The adoption of ASU 2010-17 is not expected to have any material impact on the Company’s financial position, results of operations or cash flows.

Quantitative and Qualitative Disclosures about Market Risk

Interest Rate Risk

We are exposed to market risk related to changes in interest rates primarily from our investments in certain short-term investments. Our current investment policy is to maintain an investment portfolio through highly rated financial institutions in Israel and the United States, primarily in money market funds. While our cash and investment balances will increase upon completion of this offering, we will maintain an investment portfolio consisting mainly of U.S. money market and government grade securities, directly or through managed funds. We do not utilize derivative financial instruments, derivative commodity instruments or other market risk-sensitive instruments to manage exposure to interest rate changes. Accordingly, we believe that, while the securities we hold are subject to changes in the financial standing of the issuer of such securities, we are not subject to any material risks arising from changes in interest rates.

Exchange Rate Risk

We do not use derivative financial instruments and have no foreign exchange contracts. From time to time based on market terms, we convert Dollars to NIS to hedge our expenses denominated in NIS. We are exposed to market risk associated with exchange rate movements of the U.S. dollar, our functional and reporting currency, mainly against the NIS. We expect to derive substantially all of our revenues in U.S. dollars. However, the majority of our Israeli subsidiary’s expenses are denominated in NIS, and we anticipate that a material portion of our Israeli subsidiary’s expenses will continue to be denominated in NIS. If the U.S. dollar weakens against the NIS, we will experience a negative impact on our results of operations. Historically, the effect of fluctuations in currency exchange rates has had a low impact on our consolidated operations. We periodically assess the applicability of the U.S. dollar as our functional currency by reviewing the salient indicators. Neither a 10% increase nor decrease from current exchange rates would have a material effect on our operating results or financial condition.

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BUSINESS

Overview

We are a clinical-stage pharmaceutical company engaged in discovering and developing novel RNA interference or RNAi-based therapeutics. We have a fully integrated drug development platform that spans from therapeutic target identification based on our proprietary gene discovery science and technology, to clinical drug development. We focus on RNAi-based therapeutics for the treatment of diseases associated with oxidative stress and ischemic injury. We believe that our insight into the molecular mechanisms underlying these diseases, combined with our ability to design, chemically modify and successfully deliver synthetic small-interfering RNA, or siRNA, to specific organs in the body, enables us to rapidly develop drug candidates, often directed against the same target across multiple therapeutic areas. We have three product candidates in clinical development in five different indications: PF-655 (also called PF-04523655 and previously RTP801i-14) for the treatment of diabetic macular edema and for wet age-related macular degeneration; QPI-1002 (previously I5NP or AKIi-5) for the prevention of acute kidney injury and for prevention of delayed graft function in kidney transplant patients; and QPI-1007 for ocular neuroprotection. We have licensed PF-655 to Pfizer on an exclusive worldwide basis and we granted an option to Novartis for an exclusive license to QPI-1002. In March 2011, we received the results of the Phase II DEGAS trial of PF-655 for diabetic macular edema. We have a broad pipeline based on our internally developed chemically modified siRNA structures. Several of our product candidates are based on novel targets and therapeutic concepts discovered using our BiFAR^TM target gene discovery platform. We believe that our platform technologies, siRNA capabilities and intellectual property combined with the expertise of our regulatory, medical, preclinical and clinical development group will enable us to continue to advance new product candidates into clinical development, either directly or through collaborations with major pharmaceutical companies.

PF-655 has been studied in two Phase II clinical trials for the treatment of diabetic macular edema, the DEGAS trial, and for the treatment of wet age-related macular degeneration, the MONET trial. PF-655 is a stabilized, synthetic, chemically modified siRNA that inhibits our proprietary target RTP-801, a gene we believe plays a significant role in wet age related macular degeneration and diabetic macular edema. We have licensed PF-655 to Pfizer on an exclusive worldwide basis. Pfizer is responsible for development in collaboration with us and is required to make payments to us upon achievement of development and commercialization milestones, as well as pay us royalties from sales of any approved products. In March 2011, we amended our agreement with Pfizer so that we will conduct a Phase IIb clinical trial in diabetic macular edema at higher doses at our expense in consideration for increased milestone payments and increased royalties. We have results in both DEGAS and MONET Phase II trials. Based on interim results received by Pfizer in November 2010, Pfizer continues the wet age-related macular degeneration study as planned. In the Phase II DEGAS diabetic macular edema study, the results demonstrated that the drug was well tolerated, with no observed drug related serious adverse events. Following 12-months treatment with PF-655, a dose dependent improvement in visual acuity was observed with the best results achieved at the 3 mg level. Based on the results of this study, and the demonstration of dose related effect on vision, it was decided to conduct a further phase IIb study in order to test higher doses of PF-655 and to determine the optimal dose to be included in the pivotal phase III studies. We expect to initiate the Phase IIb clinical trial at higher doses during the first half of 2011. In the development of our drug candidate QPI-1002 we completed two Phase I trials for the prevention of acute kidney injury in patients undergoing major cardiac surgery and for prevention of delayed graft function in kidney transplant patients. In both trials QPI-1002 was administered systemically with no dose limiting toxicities observed in both AKI and DGF trials. QPI-1002 is a synthetic, chemically modified siRNA molecule designed to temporarily inhibit the expression of p53, a gene we believe plays a significant role in ischemic injury related conditions in the kidney. In August 2010 we granted to Novartis an option for a worldwide exclusive license to QPI-1002 for all indications. We are also developing QPI-1007 as a neuroprotective agent for the treatment of sudden vision loss associated with non-arteritic anterior ischemic optic neuropathy. We completed Stratum 1, the safety part of our Phase I trial of QPI-1007 in patients who are legally blind and currently we are conducting Stratum 2, part of the study of Phase I, which may give early indication of the biological activity of QPI-1007 in non arteritic anterior ischemic optic neuropathy patients. QPI-1007, our third siRNA drug candidate is a chemically modified siRNA, designed to inhibit a gene named caspase 2, and it is our first drug candidate based on novel siRNA

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structure developed internally by Quark. If effective in non-arteritic anterior ischemic optic neuropathy, we plan to develop QPI-1007 also for glaucoma and/or in other ophthalmic disease in need for treatment with a neuroprotective agent. In addition, we expect to initiate during 2012 formal preclinical studies towards filing IND applications in one or more of our broad pipeline programs based on the novel siRNA structures we develop.

Our insight into the pathogenesis of diseases, combined with our proprietary targets and concepts and our solution to siRNA delivery, led us to select siRNA as the modality for our clinical programs. We believe that our integrated discovery and development approach is particularly well-suited to RNAi-based therapeutics and is based on the following main capabilities:

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Identifying clinically attractive drug targets using our BiFAR^TM discovery platform. Using our BiFAR^TM discovery platform, we have identified and validated many gene and protein targets and treatment concepts for diseases, including diseases associated with oxidative stress and ischemic injury. We focus on diseases expressed in organs where we have successfully delivered our siRNA molecules.

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Selection of diseases associated with oxidative stress across several therapeutic areas for the same target. We believe that our focus on diseases, which share common molecular mechanisms, will enable us to more quickly identify drug candidates capable of treating multiple diseases based on proprietary targets common to diseases in different organs of the body. For example, we have demonstrated in preclinical models that inhibition of the RTP-801 gene has beneficial therapeutic effects in various diseases associated with oxidative stress, such as wet age-related macular degeneration oxygen-induced retinopathy, diabetic macular edema, acute ischemia-reperfusion kidney injury, acute cigarette smoke-induced lung injury and chronic obstructive pulmonary disease. We have licensed to Pfizer the right to develop and commercialize siRNA drug candidates that inhibit RTP-801 in all indications. Furthermore, we have also demonstrated that temporary and reversible inhibition of the gene p53 limits the injury caused by oxidative stress in the kidney and in the inner ear, and thus is potentially useful for the treatment of acute renal failure and acute hearing loss.

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Designing and modifying our siRNA molecules to enable successful local or systemic delivery. Our siRNA drug candidates have a sequence selected by our SIRS algorithm, and have a chemically modified, stabilized structure and properties that we believe offer significant advantages over standard siRNAs. In preclinical studies, we have successfully delivered siRNA molecules and suppressed target genes in the back of the eye, inner ear, proximal, tubules of the kidney, lung and spinal cord, demonstrating both local and systemic delivery. We select the route of delivery that is clinically relevant for the given organ. Two of our siRNAs were delivered via local administration to the back of the eye in Phase I and Phase II studies. Our QPI-1002 was, according to publicly available information, the first siRNA administered systemically to human patients.

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Optimizing our siRNA molecules for improved potency, nuclease stability, selectivity and lack of stimulation of innate immune response. We use our internally developed siRNA structures and intellectual property to design lead drug candidates with enhanced properties and a strong intellectual property position.

Some of our product candidates are based on our BiFAR^TM target gene discovery platform and our siRNA technology platform. The BiFAR^TM platform directly identifies clinically relevant critical genes and proteins that are responsible for certain disease traits. BiFAR^TM works by high throughput, genome-wide functional screening of inhibitory elements, such as siRNA, that block activity of key components of pathologic cell responses and thus reverse the disease traits, or disease phenotype. Our BiFAR^TM discovery platform was the basis for several collaboration agreements with pharmaceutical companies and has generated many innovative targets potentially suitable to create drugs to treat a wide range of diseases. Our siRNA technology platform includes proprietary drug delivery methods, proprietary algorithms to select the most appropriate sequence for the siRNA molecule and novel siRNA structures developed based on our deep understanding of the siRNA mechanism. Our novel siRNA structures are created with the aim to provide desirable drug-like properties to our siRNA molecules and to strengthen our intellectual property position.

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We believe we have a solid intellectual property position relating to the development and commercialization of our product candidates. We seek patent protection in the United States, Europe and selected other jurisdictions for our product candidates, methods of therapeutic use, delivery methodologies, target genes and our proprietary discovery technology. As of January 31, 2011, we own or control 79 issued and 2 allowed patents in the United States and elsewhere in the world and over 140 patent applications in the United States and elsewhere. In addition, we have in-licensed on a non-exclusive basis 32 granted patents in United States and 9 other jurisdictions and 58 patent applications pending in the United States and in 14 other jurisdictions, relating to RNAi technology.

RNAi Overview

RNA interference, or RNAi, is a process that occurs naturally within cells and selectively and temporarily silences the expression of specific genes. In addition, RNAi is a naturally-occurring part of our immune system that is helpful in silencing infectious agents. Genes are the basic units of inheritance. Each gene consists of a defined segment of a substance known as deoxyribonucleic acid, or DNA. Genes provide cells with instructions (via transcription process to messenger RNA molecules) for producing proteins via a translation process of messenger RNAs. Many human diseases are caused by the abnormal behavior of proteins. A particular protein may, for example, be present in too great a quantity, be too active or appear in the wrong place or at the wrong time, or be produced in an aberrant form that has different, unwanted properties and function compared to the native one. In these circumstances, the ability to stop or reduce production of the protein by selectively silencing the expression of the gene that directs its synthesis (by destroying its messenger RNA template or interfering with the translation process) could be very beneficial in the treatment of disease. Harnessing the natural phenomenon of RNAi holds potential for the development of a new class of drugs applicable to a wide range of diseases that result from undesirable protein production. In addition the RNAi approach is applicable to viral diseases by inhibiting viral replication.

The DNA molecule is double-stranded, composed of two complementary strands of building blocks called deoxyribonucleotides. DNA is found is cell nuclei and contain all genetic information of the organism. RNA is another type of nucleic acids found in the cell. Until recently, three major RNA types were known: messenger RNA (mRNA) that is transcribed from DNA and serves a substrate for translation of genetic information stored in DNA into protein; transport RNA, or tRNA, that participates in the process of translation of information encoded in mRNA into protein; and ribosomal RNA that is contained in ribosomes, protein synthesis machines, and performs structural functions. The information in DNA is translated into proteins with the help of another substance called messenger ribonucleic acid. While the predominant form of RNA is a single-stranded molecule, cells also contain fragments of double-stranded RNA. Double-stranded RNA is processed into small fragments called small-interfering RNA, or siRNAs, that act as guides for the sequence-specific silencing of target genes. This occurs when the guide strand siRNA aligns with a messenger RNA molecule having complementary nucleotide sequences and thereby induces its degradation, or interfere with the translation process, thus temporarily silencing expression of the corresponding target gene. The potential application of the RNAi process for drug development was significantly advanced when it was shown in animal models that the introduction of synthetic siRNAs complementary to the target gene can effectively silence expression of the gene.

We believe that RNAi-based therapeutics have potentially significant advantages over traditional therapies, including the following:

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Broad Applicability. RNAi-based drugs can potentially treat any disease or condition for which an abnormal gene function or a viral agent is identified as the cause of, or as an essential contributing factor to, the disease. Importantly, included are diseases in which the protein causing the disease cannot be targeted effectively by existing drug classes, such as small molecules since their identification requires the protein to have a specific readily measurable function or monoclonal antibodies, due to poor accessibility of the target protein.

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Safety and Therapeutic Precision. Because RNAi is a naturally occurring process and because natural siRNA consists of nucleic acids, siRNA drugs can be metabolized. RNAi-based drugs may reduce or avoid some of the side effects associated with traditional small molecule drugs, as they can be designed to selectively inhibit expression of disease-associated target genes, with minimal effects on other genes in the body.

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Inherent Potency. RNAi-based drugs may have a higher potency than certain small molecule drugs because one siRNA molecule can lead to the destruction of multiple target messenger RNA molecules, thus blocking the synthesis of many protein molecules.

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Shortened and Simplified Drug Discovery Timelines. When a target gene is identified, the siRNA drug candidate is rationally designed for the sequence-specific silencing of that gene. This process typically takes a number of months and results in the identification of a drug candidate ready for animal studies. In contrast, the identification of small molecule drug candidates is expensive and time-consuming and requires multiple cycles of optimization that include challenging chemical synthesis design and testing, and often takes years.

To date, major challenges in the development of RNAi-based therapeutics have been delivery, nuclease resistance, specificity and avoiding stimulation of innate immune responses:

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Delivery. Delivery of RNAi-based therapeutics is generally more challenging than traditional small molecule or antibody delivery due to the very fast degradation and excretion of unmodified siRNA from the body. In addition, the siRNA needs to overcome multiple tissue barriers to get inside the target cells before eliciting its biological activity. Systemic delivery of a chemically synthesized siRNA to tissues and cells relevant to disease processes in the body is particularly challenging. Therefore, delivery strategies capable of transporting a siRNA molecule through physical barriers within the body to the target tissue while enhancing cellular uptake of the siRNA molecule, is key to enable the successful therapeutic applications of siRNA drugs.

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Stability. To date, one of the major limitations of RNAi has been the instability of unmodified siRNAs, which generally break down rapidly in the body. This degradation restricts the duration and magnitude of their potential therapeutic activity. Effective drugs need to be stable in body fluids and in cells to ensure an adequate therapeutic response. Chemically modified siRNA must achieve an optimal balance between stability and low toxicity as the safety profile of siRNA therapeutics depends on the fact that they can be easily degraded by the body.

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Specificity and avoiding induction of innate immune response. For siRNA-based therapeutics to be a useful as drugs, it is critical that the silencing effect of the siRNA be specific, that is, ideally, the siRNA must not cause any effects other than those related inhibiting the expression of the target gene. There are several types of nonspecific or “off-target” effects that siRNA could potentially display including the possibility of binding to matched target sequences in other messenger RNAs besides the intended target. Furthermore, there are natural defense mechanisms referred to as innate immune responses that can be activated by siRNAs. These unwanted side effects of siRNAs can be avoided by incorporating appropriate chemical modifications. Chemically modified siRNA must achieve the lowest possible level of off-target effects for the siRNA drug to be effective and safe.

Our Approach

To overcome these hurdles, our integrated siRNA discovery and development strategy is based on the following main capabilities:

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Identifying clinically attractive target genes, often but not exclusively by using our BiFAR^TM platform, that when inhibited, reverse disease phenotypes;

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Harnessing our insight into the pathogenesis of diseases associated with oxidative stress in various organs of the body to generate drug candidates that may be active across multiple therapeutic areas, focusing on diseases representing significant unmet medical needs;

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Designing and optimizing synthetic siRNAs for therapeutic application. We select the most appropriate sequences for siRNA using proprietary design algorithms and chemically modify them based on internally developed know-how protected by intellectual property to enhance properties necessary for successful application in the clinic, including:

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Potency

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Stability

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Reduced side effects stemming from off-target activity and activation of innate immune responses

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Delivering our modified siRNA molecules either locally or systemically to the appropriate diseased organs and cells in the body; and

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Developing our siRNA drug candidates in the most clinically relevant indications. To achieve this goal our fully integrated research, preclinical and clinical development groups work in teams to ensure that optimal drug design and development starts at the stage of discovery. Upon achievement of proof of concept in animal studies, often in collaboration with opinion leaders in the particular indication, our expert developments team (regulatory, medical, preclinical and clinical development) is then responsible for the clinical development.

We believe that our siRNA drug candidates meet the primary challenges of RNAi-based therapeutics development:

Delivery. In preclinical studies, we have successfully delivered our siRNA candidates locally and systemically to target cells in various organs of interest including the back of the eye, inner ear, proximal tubules of the kidney, lung, spinal cord and brain.

Stability, Specificity and Avoiding Innate Immune Response. Our siRNA drug candidates have a chemically modified, stabilized structures that we believe offer significant advantages over standard siRNAs. We chemically modify our drug candidates with naturally occurring nucleotides or other nucleotides in specific proprietary combinations and structures, that significantly reduce or completely abrogate unwanted side effects. We have shown in preclinical studies that our siRNA drug candidates exhibit favorable safety profiles following either local or systemic administration at dose levels above the proposed clinical range. In addition, we believe we have demonstrated in vitro and in vivo stability of our drug candidates to elicit therapeutic responses in animal disease models.

Our method for drug candidate selections is shown schematically below.

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We begin by identifying indications we view as attractive due to our ability to successfully deliver our siRNA molecules to the target organ and cells, and we select the route of administration that is clinically relevant for delivery to a given organ of interest. From the potential indications, we often select those associated with oxidative stress since it is a main pathogenic feature of numerous diseases in various organs. This allows us to potentially use one siRNA for multiple indications. For example, our PF-655 has been studied in Phase II clinical trials for both wet age-related macular degeneration and diabetic macular edema. We focus on diseases that represent an unmet medical need with significant market potential. We then utilize our pool of target genes, many of which were previously identified by our BiFAR^TM platform to generate potential siRNA candidates that inhibit these specific target genes. As a next step, we synthesize stabilized siRNA molecules selected by our proprietary software utilizing our siRNA structures developed internally. We test these molecules activity in vitro in cell culture and in vivo in animal models of each disease, often in collaboration with opinion leaders in the particular indication. This process typically takes only a few months for each disease. At all times we verify our selection choices in view of patentability, freedom to operate, and clinical development issues for selection of the most suitable indication for clinical development. In all steps of the process our research teams work with medical, marketing and intellectual property personnel with the objective of maximizing the opportunity for future success in clinical trials and commercialization. The outputs of this process are novel siRNA drug candidates that inhibit expression of relevant target genes for the proposed disease indication.

Our Product Candidates

Our current product pipeline includes siRNA drug candidates targeting genes associated with diseases associated with oxidative stress that represent significant unmet medical needs. The following table sets forth the status of our product pipeline and research programs:


Product Candidate	Indication	Status	Commercialization Rights
PF-655	Diabetic Macular Edema	Phase II DEGAS study terminated. Phase IIb study expected to be initiated during first half of 2011.	Pfizer (Worldwide)
PF-655	Wet Age-related Macular Degeneration	Phase II MONET study ongoing, enrollment completed. Interim data received in November 2010. Final data expected in the second half of 2011	Pfizer (Worldwide)
QPI-1002	Acute Kidney Injury	Phase II expected to initiate dosing in the second half of 2011.	Option granted to Novartis for Worldwide rights
QPI-1002	Delayed Graft Function in Kidney Transplant patients	Phase II ongoing (Interim analysis expected by mid 2012).	Option granted to Novartis for Worldwide rights
QPI-1007	Non arteritic Anterior Ischemic Optic Neuropathy	Stratum 2, of Phase I which may give early indication of the biological activity of QPI-1007 is ongoing (Dosing and preliminary review of data expected to be completed during the second half of 2011).	Quark (Worldwide)
QPI-1007	Glaucoma	Preclinical toxicity studies for multiple dosing.	Quark (Worldwide)

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Product Candidate	Indication	Status	Commercialization Rights
Program for pipeline siRNAs for neuron protection and neural regeneration	Diseases of the central nervous system, eyes and ears such as spinal cord injury, peripheral nerve injuries, neuropathic pain, hearing loss conditions, vestibular diseases.	In vivo proof-of-concept was accomplished in spinal cord injury with a drug candidate with endpoints of post-injury recovery and reduction of neuropathic pain. Further in vivo studies are ongoing in several indications.	Quark (Worldwide)
Program for respiratory system conditions	Acute Lung Injury, Lung Transplantation	In vivo proof-of-concept studies were accomplished in lung transplantation models. Further in vivo studies are ongoing.	Quark (Worldwide)
Program for chronic conditions by systemic delivery of siRNA	Chronic Kidney Disease Cancer	Delivery studies and in vivo proof-of-concept studies at various stages.	Quark (Worldwide)
Fibrotic diseases in collaboration with Nitto Denko	Fibrotic conditions in the liver and other organs	Preliminary proof of concepts was successfully performed by Nitto Denko. We are currently performing siRNA design and delivery studies. (Filing of initial IND application expected by 2012)	Nitto Denko (Worldwide)

Clinical portfolio

PF-655 in Phase II Clinical Trials for Diabetic Macular Edema and Wet Age-Related Macular Degeneration

The Drug Candidate. PF-655 is a synthetic, chemically modified siRNA molecule designed to inhibit the expression of the hypoxia- inducible gene RTP-801. Using our BiFAR^TM platform, we discovered the gene RTP-801 and identified it as a likely major factor in the induction of various diseases associated with oxidative stress. In September 2006, we exclusively licensed PF-655 to Pfizer for many indications, and are collaborating with them in the development of the drug candidate for ophthalmic indications. PF-655 is being evaluated in Phase II clinical trials, for the treatment of diabetic macular edema and for the treatment of wet age related macular degeneration. We have agreed with Pfizer to conduct, at our expense, a Phase IIb study of PF-655 in diabetic macular edema, expected to begin as early as the first half of 2011 under a protocol mutually agreed between us and Pfizer.

Preclinical results. We have conducted pharmacology studies of PF-655 in the mouse laser-induced model of choroidal neovascularization, an accepted model of wet age-related macular degeneration. In these studies, PF-655 specifically inhibited expression of RTP-801 in the choroid and inhibited both abnormal blood vessel growth and leakage in a dose-dependent manner as well as migration of inflammatory induced cells. In a side-by-side comparison, the effects of PF-655 on blood vessel growth were superior to that produced by either Macugen® or a neutralizing antibody to mouse VEGF used as an animal analogue to Lucentis®/Avastin®. In similar studies, PF-655 was found to have an additive effect in combination with Macugen® and the mouse anti-VEGF antibody to prevent neovascularization and vessel leakage. These results indicate that PF-655 acts through a different pathway than anti-VEGF drugs. PF-655 was also shown to exhibit anti-apoptotic activity, and demonstrated superior anti-inflammatory properties compared to anti-VEGF drugs. The efficacy seen in the mouse model was further confirmed in a monkey laser-induced choroidal neovascularization model of wet age related macular degeneration.

In support of the diabetic macular edema indication, RTP-801 knockout mice showed a 70% reduction in retinal blood vessel leakage compared to either mice with an intact RTP-801 gene or wild type mice, four weeks after induction of diabetes. Compared to control siRNA, PF-655 was shown to decrease retinal blood vessel leakage in the diabetic mice by 50%.

In preclinical studies, PF-655 was found to be resistant to degradation in body fluids. Based on these studies, we believe that PF-655 delivered locally (i.e., via intravitreal injection) will persist for several weeks,

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suggesting that relatively infrequent dosing may be possible in humans. Following intravitreal injection in animals, we did not observe any significant systemic exposure, demonstrating a favorable distribution profile combining the desired prolonged local exposure with limited systemic exposure. In preclinical toxicology studies, a low frequency of mild and reversible ocular inflammation was observed. Following intravenous administration, no systemic toxicity was observed in the rat at blood levels more than 10,000 times greater than levels observed in the blood of patients in Phase I human clinical studies.

Phase I Clinical Trial. We submitted an Investigational New Drug Application to the FDA for this drug candidate on September 20, 2006, and have completed Phase I trial. In the Phase I clinical trials we conducted, no dose limiting toxicities were observed. The study was an open-label, dose escalation trial in patients with wet age related macular degeneration for the safety and tolerability of PF-655 administered as a single intravitreal injection. Stratum 1 of the trial included patients who, due to advanced disease, failed to respond to a prior regimen, or were judged not likely to show improvement in their visual acuity from currently available treatment options such as Lucentis®, Macugen®, Photo Dynamic Therapy (PDT) or steroid-based therapy, or patients who had failed at least one of these prior treatment options. Stratum 2 of the trial included patients who, in the opinion of the investigator, had the potential to show improvement in visual acuity from other treatment options. Since the trial was conducted in patients, secondary objectives included determination of the changes in visual acuity after administration of PF-655. Although change in visual acuity can indicate clinical activity of the drug candidate, the trial was not designed to measure clinical activity in a statistically significant manner. However, approximately 80% of subjects showed stable or improved vision two weeks after a single injection of the siRNA. A subset of patients in this study, 18 of the 27 patients enrolled, showed a mean improvement of 4 letters (about one line gain) on a visual acuity test at 28 days after a single injection of PF-655. While the study was designed to test for safety, and not to establish efficacy, these changes were presented as clinically meaningful at the ARVO conference in 2009 by a lead investigator of the study, Dr. Quan Nguyen from the Wilmer Ophthalmological Institute of the Johns Hopkins University School of Medicine.

This Phase I study served as the basis for further clinical development in both age related macular degeneration and diabetic macular edema. Following its completion, Pfizer initiated two Phase II trials conducted in collaboration with Quark. These trials are discussed separately below.

Development of PF-655 in Diabetic Macular Edema

Disease Background and Market Opportunity. Diabetic macular edema is swelling of the macula as a result of retinal microvascular changes that occur in patients with diabetes and is the major cause of visual impairment in diabetic patients. Diabetic macular edema is a common complication of diabetic retinopathy and is the cause of most of the functional visual loss in patients with this condition. Diabetes mellitus and its systemic and ophthalmic complications represent an enormous public health threat in the United States. The prevalence of diabetes in the United States is currently estimated at 9% or approximately 21 million, though only about 55% are estimated to be diagnosed. According to a disease review in the Digital Journal of Ophthalmology, diabetic macular edema affects up to 10% of all patients with diabetes with 75,000 new cases occurring every year.

Limitations of Current Therapy. Laser photocoagulation is the current standard of care in the treatment of diabetic macular edema. Although laser therapy may slow visual loss, the major drawbacks are that it is rarely accompanied by vision gain, and it is not appropriate in all cases of diabetic macular edema. Furthermore photocoagulation is a late and destructive procedure that does not address the underlying etiology of the diseases. There are several classes of drugs that are being employed in the management of diabetic macular edema, including corticosteroids (triamcinolone acetonide) and the anti-VEGF drugs (mainly bevacizumab, and ranibizumab or Avastin® and Lucentis® respectively), however, none of these drugs is currently approved by the FDA for the treatment of diabetic macular edema. Lucentis has been recently approved by EMEA in Europe for this indication.

PF-655 Value proposition. We believe, based on preclinical and clinical results to date, that PF-655 may offer the following:

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Improvement of visual acuity in subjects with diabetic macular edema.

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PF-655 targets the proprietary gene RTP-801, and has been shown to have a distinct mechanism of action compared to current investigative VEGF-targeting drugs. We believe that the novel mechanism of action offers potential for less frequent dosing compared to competing therapies and VEGF inhibitors currently in development. In addition, due to its different mechanism of action, it may allow potential combination therapy with current therapies and therapies under investigation.

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In preclinical models PF-655 inhibited growth of new blood vessels and reduced vascular permeability, suggesting a therapeutic effect of PF-655 in diabetic macular edema, where increased vascular permeability causes increased retinal thickness and eventually visual acuity loss.

Phase II Clinical trial — the DEGAS study. PF-655 has been studied in a prospective, randomized, multi-center, comparator study evaluating efficacy and safety of PF-655 versus laser in subjects with diabetic macular edema called the DEGAS trial. This is a Phase II, single-blind, parallel-assignment safety/efficacy study conducted by Pfizer in collaboration with Quark. 184 patients were randomly assigned to four treatment groups, with three dose levels of PF-655 (0.4mg, 1mg, and 3mg) or laser control. The study was designed with a primary endpoint of mean visual acuity improvements over baseline at 24 months. Enrollment in the DEGAS study was completed in October 2009. In March 2011 we received results based upon 12 month follow up on all patients. The results demonstrated that the drug was well tolerated, with no observed drug related serious adverse events (SAEs). Following 12-months treatment with PF-655, a dose dependent improvement in visual acuity was observed with the best results achieved at the 3mg level. At this dose, the mean improvement from baseline on a visual acuity test was 5.8 letters for all patients enrolled in this dose group while in patients treated with laser photocoagulation control (the current standard of care) visual acuity has improved by only 2.4 letters on average (p=0.08). Furthermore, in a separate secondary analysis of the 11 patients who completed the 12 months follow-up visit the mean improvement from baseline on a visual acuity test was 9.14 letters while in patients treated with laser photocoagulation control visual acuity has improved by only 3.2 letters on average (p<0.01). The study was terminated at 12 months based upon the above analysis suggesting that higher doses would be necessary to produce a therapeutic effect sufficiently superior to the current standard of care to benefit patients over the long term given emerging new therapeutic modalities. Based on the results of this study, and in view of a dose related effect on vision, it was decided to conduct a further phase IIb study in order to test higher doses of PF-655 and to determine the optimal dose to be included in the pivotal phase III studies.

Phase IIb Clinical trial. We have agreed with Pfizer to amend our agreement to provide that we conduct, at our expense, a Phase IIb clinical trial of PF-655 in DME at higher doses, under a protocol mutually agreed by Quark and Pfizer. This is a Phase IIb prospective, randomized, multi-center, dose ranging, comparator study evaluating the efficacy and safety of PF-655 versus Lucentis® in subjects with diabetic macular edema. Approximately 225 subjects with diabetic macular edema will be enrolled and will be treated with PF-655 at varying doses including higher doses than in the DEGAS study or will be given Lucentis every month via intravitreal injection for a period of 6 months followed by treatment on an as needed basis for additional follow up period provided in the protocol. An interim futility analysis is included and we may terminate the trial if an independent monitoring committee determines futility. A portion of the proceeds of this offering will be used to conduct this trial. We will deliver the trial data to Pfizer upon completion. After its review of the data, Pfizer will either make a milestone payment to us at that time in an amount which exceeds the anticipated cost of the trial and resume responsibility for continued development of PF-655 at Pfizer’s expense, or will terminate its license and return the rights the product to us.

Disease Background and Market Opportunity. Age-related macular degeneration is the leading cause of central vision loss in the elderly. Age-related macular degeneration occurs when the light sensing cells in the central portion of the retina, called the macula, malfunction and over time cease to work. Wet age-related macular degeneration is the more severe form of the disease and accounts for approximately 10% of all wet age-related macular degeneration cases, yet it causes approximately 90% of blindness associated with age-related macular degeneration. Wet age-related macular degeneration occurs when abnormal blood vessels grow through a process known as neovascularization, or angiogenesis, in the layer of the vascular system immediately behind the retina, called the choroid. This growth is known as choroidal neovascularization, and damages the macula. These new blood vessels are weak and leak blood and fluid under the retina. This

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process causes damage to the retina resulting in impaired vision, blind spots and eventually blindness. Datamonitor estimates that age related macular degeneration affects 7.5 million people in the seven major markets US, Japan, France, Germany, Italy, Spain, and the UK. Close to 1.8 million adults 40 years and older have been diagnosed with the more rapidly progressive wet age-related macular degeneration with associated vision loss, and 200,000 new cases of wet age-related macular degeneration are diagnosed each year, according to National Eye Institute data. The National Eye Institute estimates that the number of people with wet age-related macular degeneration in the United States will increase by 50% to 2.95 million by 2020.

Limitations of Current Therapy. Current treatments for wet age-related macular degeneration generally slow further vision impairment, and only significantly improve vision in a minority of cases. In addition, there are non-responders to current treatments. Treatment options that attempt to control the abnormal blood vessel growth and leaking associated with wet age-related macular degeneration include laser photocoagulation and photodynamic therapy, as well as the angiogenesis inhibitor drugs Lucentis®, the standard-of-care treatment, Avastin® and Macugen®. Current non-drug therapies utilize a laser to limit the growth of abnormal blood vessels but have been shown to be destructive to the ocular tissues. Lucentis®, Avastin® and Macugen® are inhibitors of the angiogenic growth factor, VEGF, as are most of the drug therapies currently in development. According to published data, in its pivotal clinical trials, Lucentis® significantly improved vision in 29% to 40% of patients treated. Other currently available treatments have not been shown to restore a significant portion of lost visual acuity.

PF-655 Value proposition in Wet Age-Related Macular Degeneration. Given the limitations of current treatments, we believe that there is a significant need for additional treatments to improve the rate of visual gain, and to permit less frequent intravitreal injections than the currently used regimen of one injection every four weeks for Lucentis® or six weeks for Macugen®. In addition, due to its different mechanism of action, PF-655 may allow potential combination therapy with current therapies and other therapies under investigation.

Current Phase II Clinical Trial — the MONET study. PF-655 is currently being studied in a Phase II open label multicenter study, the MONET study, for age-related macular degeneration comparing PF-655 versus Lucentis® in the treatment of subjects with choroidal neovascularization. This is a safety/efficacy study conducted by Pfizer in collaboration with Quark. Enrollment of patients was completed in August 2010 and Pfizer received interim results in November 2010, upon completion of dosing and a 4-month follow up period for all patients in the study. The interim analysis for the Monet study showed that PF-655 produced increasing improvements in mean visual acuity over the 3-month dosing period. Maximum effect was observed at 10 weeks when used alone and at 12 weeks when used in combination with Lucentis®, with mean visual acuity gains of approximately 6 and 9 letters respectively. At 4 months, the primary time point, PF-655 was not numerically superior to Lucentis for mean visual acuity at any of the doses used in the study. Overall, in a review of data up to 4 months, the external Data Monitoring Committee identified no safety concerns in continuing the study. The study is therefore continuing as planned and final results are expected by the end of 2011.

QPI-1002 in Clinical Phase II for Acute Kidney Injury and Delayed Graft Function

The Drug Candidate. QPI-1002 is a synthetic, chemically modified siRNA molecule designed to temporarily inhibit expression of the human gene p53, that we believe plays a significant role in ischemia reperfusion induced injuries of the kidney that lead to development of acute kidney injury and delayed graft function. QPI-1002 is being developed for the prevention and treatment of acute kidney injury in patients undergoing major cardiovascular surgery and for prevention of delayed graft function in kidney transplantation patients. We have granted to Novartis an option for an exclusive worldwide license to QPI-1002 and any potential future p53-directed siRNAs controlled by us, for any indication.

Preclinical results. We have conducted preclinical studies in rats and monkeys. Rats treated with a single bolus injection of QPI-1002 were significantly protected from ischemia/ reperfusion-induced acute kidney injury. In preclinical studies, p53-targeted siRNA was effective in protecting rat kidneys from acute kidney injury at doses 400-fold below the toxic dose. QPI-1002 was most potentially efficacious when administered within a well-determined time window of hours post injury, and significantly reduced the severity of acute kidney injury. QPI-1002 exhibited a favorable safety profile in rats and monkeys and

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persisted for a relatively short time in the blood and kidneys. In these studies, QPI-1002 accumulated rapidly and predominantly in the kidneys, specifically in proximal tubules, following intravenous administration, QPI-1002 was also found to be resistant to degradation in body fluids. In addition, the duration of the p53 inhibitory effect in the studies was brief in all tissues tested.

QPI-1002 in Acute Kidney Injury

Disease Background and Market Opportunity. Acute kidney injury is a syndrome characterized by a rapid decline of kidney function leading to death in a high percentage of cases. Acute kidney injury complicates approximately 5% of hospital admissions and up to 30% of admissions to intensive care units. During cardiovascular surgery, ischemic conditions caused by reduced blood flow to the kidneys and reperfusion upon removal of the patient from cardiopulmonary bypass and resumption of the natural blood flow can lead to induction of acute kidney injury. Based on data of the Centers for Disease Control and Prevention (CDC) and the Society of Thoracic Surgeons, Adult Cardiac Surgery Database there are approximately 650,000 patient discharges following major adult cardiac surgery procedures each year in the United States. Among cardiac surgical patients who developed acute kidney injury severe enough to require dialysis post-operatively, reported mortality rates during the past decade have remained unacceptably high, in the range of 28% – 63%.

Limitations of Current Therapy. Currently, there are no approved drug therapies that effectively prevent or treat acute kidney injury. Generally, the goals of currently available treatments are to correct or treat the underlying condition of kidney failure and support patients with renal replacement, such as dialysis, until their kidneys have healed and can function properly. However, despite the use of aggressive dialysis regimens, the mortality rate, particularly in post surgery patients, remains high.

QPI-1002 Value proposition. We are developing QPI-1002 as a potential new therapy to prevent acute kidney injury, an unmet medical need. In cardiovascular surgery patients, acute kidney injury results from ischemia-reperfusion injury, leading to activation of p53 and subsequent induction of apoptosis (programmed cell death) in the kidney. By temporarily inhibiting the expression of p53, we believe QPI-1002 may afford kidney cells time to repair cellular damage and avoid induction of apoptosis, thus reducing the incidence of acute kidney injury and related mortality and morbidity in cardiovascular surgery patients.

Phase I Clinical Trial. We submitted an Investigational New Drug Application to the FDA for QPI-1002 for Acute Kidney Injury on July 14, 2006, and have completed a Phase I, randomized, double-blind, dose escalation trial in 16 patients of the safety and pharmacokinetics of a single intravenous injection of QPI-1002 in patients undergoing major cardiovascular surgery. This was a first-in-man study testing the safety and pharmacokinetics of QPI-1002 following injection. This was also the first systemic administration of an siRNA in human subjects. Enrollment was completed in November 2009. No dose-limiting toxicities were observed in this study. Three cases of “Worsening Anemia” Serious Adverse Events (SAEs) observed in patients receiving lower doses of the drug were assessed by one investigator as possibly related to study drug. Aggregate analyses by the independent (unblinded) Data Safety Monitoring Board (DSMB), revealed that these patients blood changes were similar to those observed in the other patients in this study. The safety profile observed in this study appeared to be consistent with that of other patients undergoing cardiac surgery. The DSMB which was responsible for reviewing unblinded safety data from both this study and the delayed graft function Phase I studies has recommended proceeding to Phase II investigations in both acute kidney injury and renal transplant populations, using the highest dose studied in Phase I.

Further development plan. A Phase II clinical trial in cardiovascular surgery patients is planned to start dosing during the second half of 2011. The trial is a prospective, randomized, double-blind, placebo-controlled Phase II trial of the safety and preliminary efficacy of a single intravenous injection of QPI-1002 in the prevention of acute kidney injury following major cardiovascular surgery performed under cardiopulmonary bypass, in patients at increased risk for acute kidney injury as determined from blood and urinary biomarkers. In the first part of the trial (60 patients) we intend to test the suitability of the biomarkers for accurately selecting patients at increased risk for acute kidney injury thus determining the feasibility of the study design. At that time we also expect to make a decision about the remaining part of the Phase II trial and implications, if any, on the study design. If the biomarker feasibility part of the trial is successful, we intend to enroll an additional approximately 188 patients. We estimate that completion of dosing and first interpretable results

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will not occur before the end of 2012. If the results meet a set of specified success criteria, we could be eligible for exercise of the license option and payment of an option exercise fee from Novartis or if already exercised we would be eligible for an additional payment from Novartis.

QPI-1002 in Delayed Graft Function

Disease Background and Market Opportunity. QPI-1002, is being developed to prevent delayed graft function after deceased donor kidney transplantation. Delayed graft function can result from ischemia-reperfusion injury during the transplantation process, leading to activation of p53 and subsequent induction of apoptosis in the kidney. Ischemia reperfusion injury occurs frequently in patients receiving kidneys that have spent a long time outside a living human body, and is particularly common in kidneys from deceased donors. When kidneys are deprived of blood, the lack of oxygen causes damage that triggers inflammation when blood flow is restored. Delayed graft function is often defined as need for dialysis in the first week following transplantation and is associated with poorer long-term patient outcomes. It is also associated with increased incidence of acute rejection; increased hospital stays and increased consumption of peri-transplant resources. Kidneys are the most frequently transplanted organs. According to Datamonitor, approximately 43,000 renal transplants will be performed annually by 2015 in the major countries of the western world, representing an average annual growth rate of 4%. Datamonitor also predicts a significant increase in the use of organs from deceased donors. Based on Organ Procurement and Transplantation data, over 16,600 kidney transplantations were performed in the United States in 2007, 64% from deceased donors. Over 80,000 people are currently on the waiting list for kidney transplant in the United States. The UNOS Renal Transplant Registry database kidney waiting list is currently increasing at a rate of 20% per year and was predicted to include between 100,000 and 150,000 patients in 2010.

Limitations of Current Therapy. Currently, there are no approved drug therapies that effectively prevent delayed graft function. Delayed graft function affects 25% to 40% of deceased donor renal transplants. According to a recent study reported in Renal and Urology News, each added day of delayed graft function is associated with a 2% increased risk of death in patients surviving at least 90 days after transplantation Currently, the main management strategy is to support the patient with dialysis and to monitor for rejection.

Value Proposition. We are developing QPI-1002 for the prevention of delayed graft function following deceased donor kidney transplantation. In animal studies, p53-targeted siRNAs were effective in protecting rat kidneys from injury due to both warm and cold ischemia that can occur during organ collection, preservation, transportation and implantation. The mechanism of action, involving temporarily inhibiting the expression of p53, is believed to afford kidney cells time to repair cellular damage and therefore avoid induction of apoptosis. Quark has been granted Orphan Drug status in the Unites States and in the European Union for development of QPI-1002 for this indication.

Phase I/II clinical trial. We submitted an Investigational New Drug Application to the FDA for QPI-1002 for Delayed Graft Function on May 15, 2008, and are currently evaluating QPI-1002 in a Phase I/II clinical study of deceased donor kidney transplantation patients. The Part A or Phase I dose escalation phase of this study was completed in November 2009. No dose-limiting toxicities were observed at the highest dose tested, which was 20-fold above the minimum effective dose in a rat model of kidney injury.

Phase II (Part B). We have initiated dosing in the Phase II part of this trial, Part B, that aims to demonstrate biological activity of QPI-1002. The study has an adaptive design with several interim analysis points. An adaptive design allows modifications to be made to trial protocol and/or statistical procedures of an ongoing clinical trial. The study protocol includes prospectively planned opportunities for modification of one or more specified aspects of the study design based on analysis of data (usually interim data) from subjects in the study. In this trial, significant interim analysis points are upon dosing 132 and 196 of the planned 326 patients to be enrolled in the study. Interim results will be analyzed by an independent board of experts, who will recommend the course of action at that point. We expect the 196 patient interim results, the first analysis point that we believe could yield statistically meaningful results, by early 2012. If the results meet the set of criteria specified in our agreement with Novartis for this milestone, we will be eligible for option exercise and payment of an option exercise fee from Novartis or if already exercised, we would be eligible for an additional payment from Novartis.

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QPI-1007 in Non-arteritic Anterior Ischemic Optic Neuropathy

The Drug Candidate. QPI-1007 is being developed as a neuroprotective agent for the treatment of sudden vision loss associated with non-arteritic anterior ischemic optic neuropathy. QPI-1007 is a chemically modified siRNA and it is our first drug candidate based on novel siRNA structures developed internally by Quark. If effective in non-arteritic anterior ischemic optic neuropathy, we also intend to develop QPI-1007 for glaucoma, which shares common pathological features with non-arteritic anterior ischemic optic neuropathy.

QPI-1007 is designed to inhibit the expression of the pro-apoptotic gene, caspase 2, via the RNAi pathway. Apoptosis (programmed cell death) is thought to be the main cause of the death of retinal ganglion cells in non-arteritic anterior ischemic optic neuropathy and glaucoma. Caspase 2 is activated specifically in retinal ganglion cells in rat models of retinal ischemic injury. In preclinical studies, QPI-1007 was effective in preserving retinal ganglion cell integrity in three different disease models of retinal ganglion cell damage. Diseases involving retinal ganglion cell damage are common. Loss of retinal ganglion cells results in irreversible loss of vision in neurodegenerative diseases such as glaucoma, but they are also directly affected in acute diseases characterized by retinal ischemia.

Preclinical results. Retinal ganglion cell death in non-arteritic anterior ischemic optic neuropathy occurs primarily through apoptosis with caspases playing a major role. Caspase 2 has been shown to be activated specifically in retinal ganglion cells in rat models of retinal ischemic and retrograde trophic factor deprivation injury. Animal studies demonstrated (i) uptake of siRNA in retinal ganglion cells following intravitreal administration, (ii) RNAi-mediated mechanism of action of QPI-1007 in ocular tissues harvested after intravitreal administration and (iii) efficacy of QPI-1007 in three animal models. QPI-1007 exhibited a favorable safety profile in toxicity studies.

Disease Background and Market Opportunity. Non-arteritic anterior ischemic optic neuropathy is a stroke in the optic nerve, leading to the death of retinal ganglion cells that transmit light signals from the retina to the brain. Since they are unable to divide, loss of retinal ganglion cells results in irreversible loss of vision. Non-arteritic anterior ischemic optic neuropathy is a potentially visually devastating disease that occurs in the middle aged and the elderly and is the most common acute optic neuropathy in older persons. This condition usually begins suddenly with little warning in one eye, but frequently occurs in the other eye over time. Vision loss often includes both the loss of visual field and visual acuity, which can vary from being nearly normal to severely impaired. The unexpected sudden visual acuity and visual field loss makes non-arteritic anterior ischemic optic neuropathy a particularly overwhelming disease for many patients. Authors of an article published in the American Journal of Ophthalmology estimated that non-arteritic anterior ischemic optic neuropathy develops in approximately 8000 people each year in the United States. According to a published eMedicine article, bilateral visual loss may be seen in 12 – 19% of non-arteritic anterior ischemic optic neuropathy cases, and it usually occurs sequentially instead of simultaneously.

Limitations of Current Therapy. No effective treatment currently is available for non-arteritic anterior ischemic optic neuropathy since neither steroids nor surgical treatment have proven to be effective. There is no evidence that optic nerve decompression and anticyclones oxygen inhalation therapy are effective, and the preventive effect of aspirin in ocular crisis is not significant.

QPI-1007 Value Proposition. Based on our extensive preclinical studies, we believe that QPI-1007 may be an effective neuroprotective agent, with potential use in non-arteritic anterior ischemic optic neuropathy and also in major diseases involving retinal ganglion cell loss, including glaucoma.

Clinical development strategy. Our clinical development strategy includes:

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Initial development of QPI-1007 will be for neuroprotection of retinal ganglion cells following a single intravitreal administration in non-arteritic anterior ischemic optic neuropathy for human proof of concept for the drug as a neuroprotectant. The reason for using non-arteritic anterior ischemic optic neuropathy for proof of concept is four-fold. First, it is a devastating disorder for which there is no treatment. Second, because the disease develops over a relatively short period of time and usually shows little progression of visual loss beyond the first month or so, it is a suitable indication for testing a neuroprotective agent in a clinical trial to provide proof of principle for the drug. Third, the damage involves retinal ganglion cell loss, a preferential mechanism for potential

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neuroprotection. Fourth, non-arteritic anterior ischemic optic neuropathy mimics an accelerated development of glaucoma, so that positive data in non-arteritic anterior ischemic optic neuropathy clinical trial would increase our confidence in QPI-1007 as a potential treatment of glaucoma as we decide whether to initiate clinical trials for glaucoma either directly or in partnership with a pharmaceutical company.

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Clinical development of QPI-1007 for additional devastating diseases such as neovascular glaucoma or closed angle glaucoma or other diseases in need of treatment by ocular neuroprotective agent. Some diseases of the glaucoma family often have acute onset, sometimes are clinical emergencies and are followed by a chronic phase. We believe administration of multiple doses QPI-1007 by intravitreal injection could be beneficial to treat such diseases.

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Development of alternative delivery means such as eye drops and/or slow release delivery and clinical development of the drug for the neuroprotective treatment of chronic glaucoma.

Phase I/IIa Clinical Trial. The Investigational New Drug Application for this indication was submitted to the FDA on September 28, 2009 and dosing in the Phase I study was initiated during the first quarter of 2010. The study is divided into two Stratums. Stratum 1 represents the dose-escalation safety component of the study and is intended to enroll 6 cohorts of patients who are legally blind secondary to chronic optic nerve atrophy or retinal degeneration, each cohort sequentially receiving increasing doses of QPI-1007. Enrollment of Stratum 1 was completed in October 2010 with no dose-limiting toxicities observed up to the highest dose level tested. Stratum 2 is designed to further evaluate safety and to provide an indication of the potential biological activity in non-arteritic anterior ischemic optic neuropathy patients as assessed through changes in visual acuity and visual field following drug administration compared to historical control. Stratum 2 is designed to enroll two dose cohorts of non-arteritic anterior ischemic optic neuropathy patients. We expect to complete dosing in Stratum 2 during the second half of 2011. Based on the results of the current trial and subject to our financial position at that time, we intend to decide whether to initiate a Phase II clinical trial in glaucoma patients by multiple intravitreal injection dosing and/or a Phase II trial in non-arteritic anterior ischemic optic neuropathy patients and/or in another disease in need of treatment by ocular neuroprotective agent. However, should our future financial position not be sufficient to complete all our clinical programs these clinical trials would be secondary to the completion of the trials as to which we have contractual commitments.

QPI-1007 Additional indications — Glaucoma

Disease Background Glaucoma is a chronic progressive disease of the optic nerve with a gradual loss of retinal ganglion cells. According to Research to Prevent Blindness organization, glaucoma is the second most common cause of legal blindness in the United States. According to the National Eye Institute and Prevent Blindness America, glaucoma affects almost 2.3 million people in the United States over 40 years of age. Vision loss from glaucoma is asymptomatic and irreversible. Clinically, glaucoma is an optic neuropathy that is characterized by progressive loss of retinal ganglion cells. It is often associated with elevated intraocular pressure and characterized by optic disc cupping — an anatomical change of the eye structure — and visual field loss. The central role of raised intraocular pressure is being questioned as many patients continue to demonstrate a disease progression despite control of intraocular pressure. Glaucoma is a collection of diseases and is a final common pathway of many disorders that affect the eye.

Open-angle Glaucoma is a chronic, bilateral, often asymmetrical disease in adults, featuring acquired loss of optic nerve fibers and abnormality in the visual field with an open anterior chamber angle and progressive death of retinal ganglion cells and usually elevated intraocular pressure. According to the National Eye Institute, the disease affects 2.5 to 3 million persons in the United States.

Limitations of the current therapy. Anti-glaucoma medications have the largest share of the ophthalmic pharmaceutical market. Nevertheless, glaucoma is a disease that currently cannot be cured; instead, current therapies focus on managing it and slowing its progression. Lowering intraocular pressure is currently the only clinical therapy available in the treatment of glaucoma. Unfortunately, many patients continue to lose vision despite successful intraocular pressure control.

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QPI-1007 Value proposition. We believe neuroprotective agents will be a key development in the ophthalmic pharmaceutical market in general and specifically the glaucoma market. The ability to protect retinal ganglion cells from cell death and thereby slow progression of glaucoma, we believe, will represent a major breakthrough in glaucoma treatment and provide opportunity for considerable growth in this segment of the market.

Preclinical pipeline and Other Research Programs

We are developing additional siRNA drug candidates, several of which have completed proof-of-concept in vivo animal testing. A subset of these is in lead candidate optimization stage. Additional siRNA molecules are currently in proof of concept studies in several indications. In these proof of concept studies we work with leading scientists and physicians at major universities and institutions. Our medical, regulatory and commercial teams evaluate the most suitable indications for future clinical trials and development. Our objective is to complete the preclinical studies necessary to support filing at least one IND application in 2012 for a molecule developed in these programs. We also have a research and development program in fibrotic disease in collaboration with, and fully funded by, Nitto Denko. The objective of this program is to complete all studies necessary for filing an IND application within 2012. Our additional research programs are directed to developing our technology, in particular novel and proprietary siRNA structures and stabilization chemistry and proprietary specific cell type-targeted siRNA delivery systems.

We have three broad internal programs in which we design and develop siRNA molecules based on our internally proprietary siRNA structures to treat diseases that are unmet medical needs, each of which is briefly described below.

Neuroprotection and regeneration program. We include in this category our pipeline programs in diseases of the central nervous system (spinal cord and brain), and diseases of the eye and ear, in particular those diseases where neuroprotection and/or axon regeneration is important.

There are numerous severe diseases characterized by acute or progressive death of neurons. In many of the diseases this process begins with injury to the nerve, the long projection of the neuron that conducts electrical nerve impulses away from the neuron’s cell body. Axon loss contributes to neurological symptoms in disorders as diverse as stroke, traumatic brain and spinal cord injury, peripheral neuropathies and chronic neurodegenerative diseases and glaucoma in which the optic nerve is affected. The overall objective of this program is to develop a drug that is able to protect against loss of neurological function and/or improve functional recovery.

We have demonstrated in preclinical models siRNA delivery to the target neurons in several disease conditions listed below and we are developing a novel non-invasive siRNA delivery to the back of the eye, inner ear and brain. Our primary siRNA drug candidate in this category is an siRNA molecule inhibiting the target gene called RhoA. RhoA is a small GTPase that controls cellular functions including motility, growth, differentiation, and apoptosis and is a key intracellular effector of inhibitory signals for outgrowth of neuronal processes. For this molecule we have shown proof of concept in spinal cord injury, demonstrating the capability of the RhoA siRNA molecule to improve neurologic functions and reduce neuropathic pain in a rat spinal cord injury model. We are now optimizing RhoA siRNA with the purpose of generating the lead siRNA for formal preclinical development. In line with our strategy of developing a drug candidate in several diseases based on common pathological mechanism, we are testing RhoA siRNA and siRNAs targeting further genes, in additional disease models including spinal cord injury, neuropathic pain due to peripheral nerve injury, optic nerve regeneration following crush injury and Meniere’s disease. Other pipeline siRNAs are also being tested in these and other models involving neurological pathologies. We are exploring both invasive and non-invasive siRNA delivery to the back of the eye, inner ear and brain.

Respiratory and inflammatory disease program. We have established that our synthetic siRNAs can be delivered by inhalation efficiently to monkeys and rodent lungs. We have tested activity of several different siRNA molecules in rat and mouse models of lung injury and lung transplantation and have developed a combination of siRNAs inhibiting genes from the family of toll-like receptors (TLRs), a class of proteins that play a key role in the innate immune system and have important function in inflammatory processes. We have demonstrated potential efficacy in preventing primary graft dysfunction in a mouse model of lung transplantation. Primary graft dysfunction is caused by ischemia-reperfusion injury to the lung in the first 72

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hours following lung transplantation and is a major cause of early morbidity, chronic graft rejection and mortality. In our preclinical studies our dual siRNA drug candidate effectively reduced infiltration of inflammatory cells, pulmonary edema and intra-graft hemorrhages and prevented impairment of pulmonary function when locally administered shortly after transplantation. We believe that our drug candidate also may be useful for treatment of acute lung injury in conditions other than lung transplantation since the pathological mechanisms of response to ischemic injury is similar.

Currently we are completing the proof of concept studies in the rodent model of lung transplantation. Due to the pivotal role of our selected targets in inflammatory processes induced in tissues in response to injury, we are also studying additional indications in which our dual siRNA drug candidate can be used.

Chronic disease by systemic administration. This category includes our development efforts to treat chronic kidney disease and cancer.

Cancer. Our programs in cancer include the following areas:

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Targeted treatment of cancer either with a single siRNA agent or in combination with chemotherapeutic agents. Initial indication may be primary and/or metastatic tumors in the lung. We have demonstrated the feasibility of delivery of siRNA to tumors growing in mouse lungs using inhaled synthetic stabilized siRNA. We demonstrated that treatment of cancer-bearing mice with siRNA targeting our proprietary target sensitized them to chemotherapy and resulted in reduction of tumor load in lungs compared to control. The lungs are a common site of involvement for primary malignancies and for metastases from lung cancer and other cancers including breast, colon, and prostate cancer.

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Development of targeted delivery. We believe that targeted delivery to cancer cells is important in order to provide therapeutically relevant concentrations of anticancer agents at the site of action and spare normal tissues. We are working on the concept of using carriers for our siRNA drug candidates to transport the drug to the cancer cells. We have identified and generated a specific proprietary antibody targeting a receptor expressed on cancer cells for targeting our siRNA therapeutics.

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Targeting tumor infiltrating cells that support tumor progression. Tumor infiltrating cells support tumor growth by promoting, for example, angiogenesis or generation of new blood vessels to feed the tumor. These cells also may suppress antitumor immune responses. By targeting these tumor support mechanisms we believe we can suppress tumor growth.

Chronic kidney disease. We are currently performing siRNA drug delivery studies with the aim to deliver our siRNA drug candidates to the appropriate cells in the kidneys to treat chronic kidney disease. Chronic kidney disease is the gradual and usually permanent loss of kidney function over time. Chronic kidney disease is a major health problem in the United States. According to the National Kidney Foundation, 26 million adults in the United States have chronic kidney disease and millions of others are at increased risk. Currently there is no specific treatment shown to slow the progression of chronic kidney disease.

Fibrotic diseases. No effective treatment is available for most of the serious fibrotic diseases and our objective is to develop potential therapies within our fully-funded collaboration with Nitto Denko. Specifically, our goal is to develop one or more new siRNA drugs that may offer an effective treatment to fibrotic diseases. The collaboration utilizes our technology and intellectual property in RNAi to identify, select, optimize and develop a new drug based on a therapeutic concept and target gene identified by Nitto Denko and its collaborating scientists, which drug may potentially be combined with Nitto Denko’s delivery technology. While the initial disease indication for development is yet to be determined by joint teams of Quark and Nitto Denko, potential diseases include liver fibrosis, lung fibrosis, bone marrow fibrosis and kidney fibrosis, all of which are major unmet medical needs. Quark successfully performed a feasibility study funded by Nitto Denko confirming the validity of the concept of treating fibrotic disease with an siRNA drug inhibiting a Nitto Denko target. The collaboration research and development was initiated in July 2010 and several potential drug candidates were generated and are being tested in vitro and in animal studies. Our objective is to file a first IND application based on our joint efforts in this collaboration in 2012.

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We believe the Nitto Denko collaboration is a validation of our siRNA platform and intellectual property and may assist us in potentially securing additional platform collaboration agreements.

siRNA Technology Development. We have an ongoing program that aims to develop new siRNA-related technologies and to continuously improve our current technology platform and our intellectual property position in the RNAi intellectual property space. To date, we have filed six patent applications claiming novel structures and six patent applications claiming novel delivery methods. QPI-1007 is our first product in clinical trials that has an internally developed novel structure. This program has two arms:

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Development of novel siRNA structures that are free from third party intellectual property. We already have developed a number of structures and filed six patent applications to date. Based on our understanding of the siRNA mechanism, this program uses our siRNA chemistry expertise to identify critical positions on the siRNA sequence and critical patterns and to incorporate chemical modifications at such positions to create siRNA compounds with desirable properties to enhance activity, reduce unwanted or off-target effects, minimize unwanted immune response effects and increase the stability of our siRNA drug candidates.

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Development of proprietary drug delivery methods. This program includes novel non-invasive delivery of siRNA to the back of the eye, inner ear and the brain, as well as novel methods of delivery to tumor cells.

Israeli National siRNA Project Consortium

In July 2010, the Israeli Chief Scientist and the head of the research and development national projects approved the establishment of a consortium headed by the wholly owned subsidiary of Quark, QBI Enterprises Ltd., or QBI. QBI, together with several leading members of the industry and prominent scientists in academia in Israel to develop novel generic technologies in the field of RNAi. We believe that the approval of a national project for siRNA is recognition by the government of Israel to financially support a project of national importance that can potentially create more jobs and general revenues for the state of Israel. In broad terms the generic technologies are planned to be developed in the following three categories:

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Chemistry: Technologies related to chemical modifications, the basic structure and manufacture of RNAi drug molecules. The objective is to allow development of more efficacious drugs with fewer side effects, with freedom to operate in the intellectual property space of RNAi and using efficient manufacturing processes.

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Formulations: Technologies related to the development of delivery methods and formulations that will facilitate delivery of the drug molecule to the specific organ and cells in the human body in order to treat the disease of interest.

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Analytical Methods: to facilitate discovery research as well as preclinical and clinical development.

In accordance with the rules of the Chief Scientist and as approved by our Board of Directors, the intellectual property and technologies developed by QBI in the Consortium shall remain with QBI at all times.

Our Strategy

Our goal is to discover, develop and commercialize novel therapeutics addressing significant unmet medical needs by using our novel targets to develop RNAi based drugs. To achieve this goal, we are pursuing the following strategies:

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Pursue clinical development of our drug candidates for the treatment of acute kidney injury and delayed graft function and for ocular neuroprotection;

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Maximize the value of our current collaborations, including our collaboration with Pfizer, our option and license agreements with Novartis and our drug discovery and development collaboration with Nitto Denko, and selectively enter into new collaborations for drug candidates that we develop and into new platform collaborations, while seeking to retain marketing rights in major markets when possible;

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Augment and develop our pipeline utilizing our know-how and intellectual property in siRNA and their local or systemic delivery to specific target cells;

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Expeditiously introduce additional potential drug candidates to preclinical studies and clinical trials; and

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Continuously develop our siRNA technologies for generation of drug candidates with optimal characteristics and for enhancing our capabilities to deliver siRNA drugs to disease cells and tissues.

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Maintain and expand our patent portfolio in targets and technologies and further strengthen our intellectual property position in chemically modified siRNA.

Our License and Collaboration Agreements

Our License Agreement with Pfizer

In September 2006, we granted Pfizer an exclusive worldwide license to develop and commercialize drug candidates that inhibit our proprietary target gene RTP-801 through RNAi. We amended our agreement with Pfizer in May 2008, and again in March 2011. The lead product candidate under the agreement is our drug candidate, PF-655, previously RTP801i-14, for treating wet age-related macular degeneration and diabetic macular edema, currently in Phase II clinical trials. Under the agreement, Pfizer has the exclusive right to develop drugs for ophthalmic and non-ophthalmic indications.

Pursuant to the agreement, with the exception of our planned Phase IIb study of PF-655 in diabetic macular edema, which will be at our sole expense, Pfizer is responsible for all future preclinical and clinical development costs of the licensed drug candidates, as well as all regulatory filings and approvals. The parties will share oversight of development through product-specific committees, but Pfizer has ultimate decision-making authority, except for our planned Phase IIb study of PF-655 in diabetic macular edema.

In March 2011, we amended our License Agreement with Pfizer to cause Quark to conduct at its own expense a Phase IIb trial of PF-655 in diabetic macular edema, under a protocol mutually agreed by Quark and Pfizer. We may terminate the conduct of the Phase IIb clinical trial if an independent monitoring committee determines, at interim review points set forth in the protocol, that the trial is futile. Quark will deliver the data to Pfizer upon completion. After its review of the data, Pfizer will either make a milestone payment to Quark at that time in an amount which exceeds the anticipated cost of the trial and resume its responsibility for further development of PF-655 or will terminate its license and return the rights to Quark. In consideration of Quark’s conduct of the Phase IIb trial, the parties also agreed to materially increase the development and product approval milestone payments associated with the first ophthalmic use of PF-655 as well as the royalty rates under the agreement. The total additional amount in milestone payments, including the amount payable upon successful completion of the Phase IIb clinical trial is $70.0 million. The future development and product approval milestone payments referred to in this description of our license agreement with Pfizer are inclusive of the increases given effect in the March 2011 amendment.

Pfizer will be responsible for manufacturing all product candidates for preclinical and clinical development and for commercial supply except for our planned Phase IIb study of PF-655 in diabetic macular edema, for which we will be responsible for procuring clinical supply of PF-655. In addition, if Pfizer desires a second commercial manufacturing site, Pfizer will consider engaging us to manufacture products commercially, provided that we can competitively satisfy its manufacturing requirements. Pfizer has worldwide commercialization rights to all product candidates licensed under the agreement, but has agreed to appoint us its exclusive distributor in Israel of products developed under the agreement.

In connection with the agreement, through December 31, 2010 Pfizer had paid us an aggregate of approximately $52.5 million in up-front fees, cost reimbursements and milestone payments. The agreement as amended provides for up to approximately $243 million in additional development and other non-sales based milestone payments in connection with a first ophthalmic indication, of which between 40% to 50% is linked to events up to the receipt of marketing approval and the remainder of which is linked to events following marketing approval. To the extent a second ophthalmic indication is pursued, we would be entitled to receive up to $49 million in development and other non-sales based milestone payments, the majority of which is linked to events following marketing approval. In addition, to the extent that clinical trials for a non-ophthalmic indication are successfully completed, we would be entitled to receive additional tens of millions of dollars. The agreement provides for up to $384 million in aggregate development and product approval milestone payments, inclusive of amounts already paid, assuming the development and approval in

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all major markets of a product for two ophthalmic indications and at least one non-ophthalmic indication. Pfizer is required to pay us royalties on any sales of licensed products at rates higher than 10% and lower than 18%, subject to potential reductions depending upon, for example, the degree of exclusivity of the licensed product in the marketplace and the extent of Pfizer’s third party royalty obligations in connection with the commercialization of our drug. Further Pfizer is required to pay us up to an additional $309 million in sales-based milestone payments.

Pfizer may terminate the agreement without cause at any time upon prior written notice. If not terminated, the agreement will remain in effect in each country until at least the later of the expiration of all relevant patents or ten years from the first commercial sale of the licensed product in each such country. In addition, Pfizer may grant sublicenses for PF-655, provided, however, that our consent will be required for sublicenses in the United States, the largest countries of the EU, or Japan (which consent may not be unreasonably withheld, conditioned or delayed).

Our Option Agreement with Novartis

On August 17, 2010, we entered into an Option Agreement with Novartis International Pharmaceutical Limited (the “Option Agreement”) under which we granted to Novartis an option to license QPI-1002, our siRNA therapeutic directed against the p53 gene. In the event that Novartis exercises this option, we will automatically grant to Novartis an exclusive, worldwide license to develop and commercialize QPI-1002 and any other p53-directed siRNAs controlled by us, pursuant to a separate, pre-negotiated license agreement (the “License Agreement”). During the term of the Option Agreement and License Agreement, we are prohibited from entering into a collaboration or license agreement with any third party in connection with the development or commercialization of any p53-directed siRNA.

Prior to exercise of the option, we will conduct at our expense Phase II trials on QPI-1002 for two indications: delayed graft function following renal transplantation and acute kidney injury following cardiovascular surgery. Novartis’ option will expire a few months following receipt by Novartis of the final results of the first Phase II clinical trial that meets the pre-defined success criteria, or a few months following receipt of the final results of both Phase II clinical trials, if neither meets the pre-defined success criteria. In the event that Novartis does not exercise the option prior to its expiration, the License Agreement will not come into effect, and in most cases we will be free to enter into agreements with third parties relating to QPI-1002 without further obligation to Novartis. However, under certain circumstances of failure in both Phase II trials, Novartis will have a right of first negotiation for a pre-set period of time in the event that we determine to license QPI-1002 or another p53-directed siRNA to a third party.

Following exercise of the option, Novartis will be solely responsible for all development, manufacturing, and commercialization of the licensed products, except that we will remain obliged to complete at our own expense the remaining portions, if any, of the Phase II trials for QPI-1002 that we initiated. Additionally, Quark will have the right to conduct a portion of the phase III clinical trials in Israel and to act as Novartis’ distributor of products in Israel, in accordance with agreements that will be negotiated by the parties. Novartis’ development and commercialization will be overseen by a joint steering committee with members appointed by both us and Novartis, but Novartis will have the deciding vote in the event of any disputes.

Upon execution of the Option Agreement, Novartis paid us a $10 million option grant fee. Assuming that the option is exercised, we could potentially receive up to $480 million in option exercise fees and development and regulatory milestone payments and up to $190 million in sales-based milestone payments. The majority of the development and regulatory milestone payments are linked to events relating to the acute kidney injury indication, and the remainder of the development and regulatory milestone payments are split, in roughly equal parts, between the delayed graft function indication and an unspecified third indication. In addition, we would be entitled to receive royalties on net sales of licensed products at a rates higher than 10% and lower than 20%, subject to potential reductions depending upon, for example, the degree of exclusivity of the licensed product in the marketplace and the extent of Novartis’ third party royalty obligations in connection with the commercialization of our drug.

Either we or Novartis may terminate the License Agreement in the event of an uncured material breach or insolvency of the other party, and Novartis may terminate the License Agreement without cause at any time upon prior written notice. Following termination of the License Agreement by Novartis for our material

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breach or insolvency, all licenses granted to Novartis will remain in effect, and Novartis’ payment obligations will continue, subject to significant reduction in the event of certain material breaches. If not terminated, the License Agreement will remain in effect, for a particular licensed product in a given country, until the expiration of all relevant patents and regulatory exclusivity with respect to such licensed product and such country, or ten years from the first commercial sale of such licensed product in such country, whichever is later.

Our Research Collaborations with other Pharmaceutical Companies

Between 1995 and 2004 we entered into collaboration agreements with Mitsubishi Pharmaceutical Corporation, Sankyo Co., Ltd., Taisho Pharmaceutical Co., Ltd., AstraZeneca, Astellas Pharma Inc., and Shionogi & Co., Ltd. Under each collaboration, we applied our BiFAR^TM platform to discover novel target genes potentially suitable for drug development in a disease field of interest to the collaborator. Each agreement required the collaborator to fund our research during an initial feasibility period and, if successful, a follow on research period of at least three years. Each collaboration agreement proceeded beyond the initial feasibility period, and in most the funded research stage was extended beyond the initial three year period. The funded research stage has now been completed under each of these collaborations.

In each case, our BiFAR^TM discovery platform yielded target genes potentially suitable for development of therapies to treat the diseases of interest. Most of these collaborators selected a number of targets for further development, and we have granted exclusive licenses in specific disease areas requiring the collaborator to develop and commercialize products within specified time periods. We retain rights to non-selected or returned targets, as well as those that are not developed within the time limits. All of these collaborators are required to make payments to us upon the achievement of certain development milestones and to pay royalties on sales of any licensed products. In most cases these collaborators have granted us certain commercialization rights in North America and major European countries.

The Silence Therapeutics (formerly Atugen) Agreements

In December 2004, we entered into a collaboration agreement with Silence. Pursuant to this agreement, Silence granted us an exclusive worldwide license under its RNAi technology to develop and commercialize our RNAi product candidates based on our target gene RTP-801.

In September 2006, we amended the Silence collaboration agreement in connection with the Pfizer license agreement, under which we sublicensed to Pfizer our rights under the license from Silence. This amendment clarified payments among the parties, terminated a license we granted to Silence in 2004, and provided for a direct license from Silence to Pfizer in the event of termination of the Pfizer agreement. Under the amended Silence collaboration agreement, we pay Silence a mid teens range percentage of our receipts from Pfizer under the Pfizer agreement, including milestone and royalty payments, but excluding payments specifically committed to cover research and development costs. The percentage we are required to pay may be reduced if we are required to pay royalties to third parties for additional intellectual property.

Unless earlier terminated, the Silence collaboration agreement will continue in force until the expiration of the royalty term, which will occur upon expiration of all relevant patents or ten years from first commercial sale of a licensed product, whichever occurs last. Either party may terminate the Silence collaboration agreement upon advance notice for the other party’s bankruptcy or uncured material breach.

In April 2005, we entered into a second agreement with Silence, the option and license agreement, pursuant to which Silence granted us options to non-exclusive licenses to Silence’s RNAi-related intellectual property to develop and commercialize siRNA product candidates based on five additional proprietary target genes, including p53. We exercised our option with respect to p53 and paid an option fee of €50,000 and an exercise fee of €500,000. Through December 31, 2010, we have paid $6.9 million in option fee payments and development milestone payments to Silence. Under the agreement we are required to make further payments based on the progress of clinical trials and regulatory approval of licensed products in the United States, Japan and Europe. We are also required to pay royalties on sales of any licensed products for which we have exercised an option. If we elect to sublicense our rights under this Silence agreement we are required to pay, in lieu of any other payments, a fixed percentage of all payments we receive from the sublicensee, the percentage being dependent on the clinical stage of the drug at the time of sublicense. We have not granted

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any sublicenses at this time but in August 2010 we granted an option to Novartis to obtain a sublicense under our rights under this Silence agreement.

In December 2010, we entered into an amendment of the option and license agreement with Silence, pursuant to which we and Silence clarified our payment obligations in connection with any payments that we receive from Novartis. Under this amendment, we are required to pay Silence a percentage in the low teens range of any sublicensing revenues we receive from Novartis, if Novartis chooses to exercise the option we granted to them. We are also required to pay Silence certain lump-sum payments upon the achievement of certain events, the aggregate of which is below $1 million. Under certain circumstances, we may choose not to pay part of such lump-sum payments, in which case the percentage we are required to pay on any sublicensing revenues we receive from Novartis, if Novartis chooses to exercise the option, will increase to the mid teens range. This amendment will be in force as long as our agreement with Novartis is in force.

The Alnylam Agreements

In conjunction with the Pfizer agreement executed in September 2006, we entered into a set of license agreements with Alnylam Pharmaceuticals, Inc. Pursuant to these agreements, Alnylam granted us non-exclusive worldwide licenses under three families of patents and patent applications owned or controlled by Alnylam. Each agreement is specific to one of our proprietary targets p53 and RTP-801 and to certain therapeutic fields, including all indications we contemplate for these target genes. We sublicensed our rights under the RTP-801 Alnylam agreements to Pfizer in the September 2006 license agreement. We have not granted any sublicenses at this time under the p53 Alnylam agreements, but in August 2010 we granted an option to Novartis to obtain a sublicense under our rights under these agreement.

Pursuant to the terms of the license agreements, through December 31, 2010, we paid Alnylam fees totaling $2.0 million. The agreements provide for annual maintenance fees and up to $6.5 million in additional development and product approval milestone payments. We are also required to pay low single digit royalties on our sales or sales by our sublicensee. The royalty rates vary based on which patent families cover the products sold on a country by country basis. Under the Pfizer agreement, Pfizer will partially reimburse our payments to Alnylam under the RTP-801 agreement.

Unless earlier terminated, the Alnylam license agreements will continue until the expiration or abandonment of all relevant patents and patent applications. Alnylam may terminate the Alnylam license agreements upon advance notice for our uncured material breach. In addition, we can terminate the Alnylam license agreements at will upon advance notice at any time.

Our Agreement with the University of Illinois at Chicago

In September 1999, the University of Illinois at Chicago granted us an exclusive worldwide license under its patents and patent applications related to the therapeutic inhibition of p53 and small molecule p53 inhibitors for all uses and indications.

Under the agreement, we are required to pay the University of Illinois at Chicago a low single digit royalty on sales of products incorporating intellectual property licensed from the University of Illinois at Chicago or a percentage share in the low teens range of any payments we receive from sublicensees, including milestone and royalty payments subject to certain exclusions. Payments to the University of Illinois at Chicago may be reduced in the event we are required to pay additional royalties to third parties for licenses of intellectual property required to develop, manufacture, or commercialize the licensed products. We are also required to pay the University of Illinois at Chicago certain lump-sum payments upon the achievement of certain events, the aggregate of which is below $1 million. To date, we have not granted any sublicenses under our license from the University of Illinois at Chicago, but we have granted Novartis an option to obtain an exclusive sublicense through our option agreement with Novartis.

Unless earlier terminated, the agreement will continue until the expiration of all relevant patents. Either party may terminate the agreement upon advance notice for the other party’s bankruptcy or uncured material breach, and we can terminate the agreement at will upon advance notice at any time. In addition, the University of Illinois at Chicago may terminate the agreement if we do not meet a general diligence obligation to use commercially reasonable efforts to bring licensed products to market. Our license with respect to a

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particular licensed product will terminate for failure to meet specific development milestones by agreed-upon deadlines, which we may extend for a limited time period by paying an extension fee.

Our Agreement with Dharmacon

In January 2010, Dharmacon, Inc., a wholly owned subsidiary of Thermo Fisher Scientific Inc. (“Dharmacon”), granted us an exclusive worldwide license under its patents and patent applications related to specific siRNA molecule(s) and their use for the inhibition of p53 for all uses and indications in humans. Dharmacon has retained certain rights with respect to products covered by the licensed patents for uses outside our exclusive field. Under the agreement, we are required to pay up to $11.6 million in milestone payments upon achievement of development and commercialization milestones as well as low single digit royalties on future sales of licensed product. We are also required to pay a low single digit share of any payments we receive from sublicensees, including upfront and milestones payments but excluding royalties on sales by sublicense and certain other payments. To date, we have not granted any sublicenses under our license from the Dharmacon, but we have granted Novartis an option to obtain an exclusive sublicense through our option agreement with Novartis. As of December 31, 2010, the Company paid or accrued $450,000 under the agreement with Dharmacon.

Unless earlier terminated, the Dharmacon agreement will continue until the expiration of all relevant patents. Either party may terminate the agreement upon advance notice for the other party’s bankruptcy or uncured material breach, and in particular, Dharmacon may terminate the agreement if we do not use commercially reasonable efforts to develop and commercialize at least one licensed product. In addition, we can terminate the agreement with advance notice if we discontinue our development program for licensed products.

Our Agreement with Nitto Denko

In June 2010, we entered into a license and collaboration agreement with Nitto Denko Corporation for the development of siRNA therapeutics for the treatment of fibrotic diseases, pursuant to which we granted a license to Nitto Denko to use our siRNA-related intellectual property to develop, manufacture, and commercialize siRNA therapeutics directed against specific target genes. We are obligated to perform certain initial research activities for development of these therapeutics through the submission of the first IND application in the United States. Nitto Denko will be responsible for the remaining development, and for the worldwide commercialization of any resulting product. During the term of the agreement, we are prohibited from researching, developing, or commercializing siRNA compounds directed against the target genes that are the subject of the collaboration. The agreement does not restrict our ability to use, or license others to use, our siRNA-related intellectual property in connection with other target genes.

Nitto Denko will fully fund our initial research, and we are entitled to receive low single digit royalties on future sales of licensed products, as well as certain additional payments that will be negotiated by the parties in the future.

Unless earlier terminated, the Nitto Denko agreement will continue until the expiration of the royalty term, which is the later of ten years from the first commercial sale or the expiration of all relevant patents. Either party may terminate the agreement upon advance notice for the other party’s uncured material breach. Nitto Denko may terminate the agreement in the event of the bankruptcy or insolvency of Quark.

In addition, Nitto Denko has the right to terminate the agreement at the end of certain stages of the initial research or at any time after the submission of the first IND application in the United States. Following such a termination of the Agreement, Nitto Denko may retain its license rights under our intellectual property by paying a lump sum payment, which payment will be in lieu of any further payments to us.

During the year 2010, we have received research and development funding of $2.2 million under the above-mentioned agreement with Nitto Denko.

Our Collaboration With BioSpring GmbH

BioSpring GmbH is a manufacturer of siRNA molecules which has been a supplier to us for many years. For the past four years, we have collaborated with BioSpring to identify novel molecules which may be a basis for future drug candidates. BioSpring has assigned to us its ownership interest, if any, in the patents

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arising from this collaborative work. However, the exact terms and conditions associated with this assignment have not been reduced to a definitive agreement. We recently reached agreement in principle with BioSpring regarding these terms and conditions and are currently in the process of preparing a definitive agreement.

Competition

The pharmaceutical and biotechnology industries are intensely competitive, and several of our product candidates, if commercialized, would compete with existing drugs and therapies. In addition, there are many pharmaceutical companies, biotechnology companies, public and private universities, government agencies and research organizations actively engaged in research and development of products targeting the same markets as our product candidates. Many of these organizations have substantially greater financial, technical, manufacturing and marketing resources than we have. Our ability to compete successfully will depend largely on our ability to:

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design and develop products that are superior to other products in the market;

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attract and retain qualified scientific, product development and commercial personnel;

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obtain patent and/or other proprietary protection for our product candidates and technologies;

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obtain required regulatory approvals; and

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successfully collaborate with pharmaceutical companies in the design, development and commercialization of new products.

We expect to compete on, among other things, product efficacy and safety, time to market, price, extent of adverse side effects and the basis of and convenience of treatment procedures. In order to compete successfully, we will need to identify and develop products and exploit these products commercially before others are able to develop competitive products.

If PF-655 is approved for wet age-related macular degeneration and/or for diabetic macular edema, we anticipate that it would compete with other marketed therapeutics, particularly vascular endothelial growth factor inhibitor drugs, primarily Genentech’s Lucentis®, recently approved by the FDA for wet age-related macular degeneration and which has become the standard-of-care for the treatment of wet age-related macular degeneration and is under investigation for diabetic macular edema. PF-655 may also face competition from off-label use of Genentech’s Avastin®, currently approved for the treatment of various cancers. Additional therapeutics that are in development could also compete with PF-655. These include further anti-vascular endothelial growth factor angiogenesis inhibitors and other drugs. Among these, Macugen®, approved for the treatment of wet age-related macular degeneration and marketed and sold outside of the United States by Pfizer and in the United States by Eyetech Inc., has recently been shown to improve vision in patients with diabetic macular edema in a Phase III clinical trial, Alcon Research is evaluating Anacortave Acetate (Retaane), an antiangiogenic synthetic steroid drug. Allergan is developing its siRNA drug candidate AGN211745, Regeneron’s intravitreal formulation of soluble decoy receptor vascular endothelial growth factor VEGF Trap-Eve (aflibercept) TRAP is in Phase III clinical trials for wet age related macular degeneration in collaboration with Bayer, CoMentis, Inc. is developing ATG3, a topical eye drop therapy, MacuSight and Santen are developing Perceiva (sirolimus, rapamycin) for diabetic macular edema and age-related macular degeneration, Ophthotech is developing E10030, a pegylated aptamer that binds and inhibits PDGF in combination with Lucentis, Alimera is developing pSivida’s Iluvien® and intravitreal insert, to deliver fluocinolone acetonide, a corticosteroid, to the retina for up to three years as a treatment for diabetic macular edema and age-related macular degeneration.

QPI-1002. We are not aware of specific drugs marketed for the prevention of acute renal failure. However, in response to the unmet medical need, new products could be developed, such as Action Pharma’s AP214 for acute kidney injury, or existing products could be used off-label, such as Nesiritide, a recombinant form of human B-type natriuretic peptide (hBNP) therapy approved for the treatment of acute congestive heart failure. A phase III trial is ongoing for the use of Nesiritide in thoracic aneurysm repair to prevent acute renal failure.

QPI-1007. We are not aware of specific drugs approved or marketed as an ocular neuroprotective agent. Recent significant advances in understanding the mechanisms for death of retinal neurons prompted renewed

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interest in development of neuroprotective agents, in particular focusing on neuroprotection for glaucoma. For example, Pfizer Inc. and NicOx SA were developing PF-03187207 for glaucoma. Following completion of phase II clinical trials, NicOx reacquired the rights to the product from Pfizer.

Manufacturing and Supply

All of our current good manufacturing practices manufacturing is outsourced to third parties with oversight by our internal managers. We have limited non-current good manufacturing practices manufacturing capacity in-house. We rely on third-party manufacturers to produce sufficient quantities of material for use in preclinical studies and clinical trials, particularly synthetic siRNA. We intend to continue this practice for any future clinical trials and large-scale commercialization of any RNAi drug candidates for which we retain significant development and commercialization rights.

Avecia, Agilent Technologies and BioSpring are the primary contract manufacturers on which we rely for our supply of synthetic siRNA, and Pyramid Laboratories is our primary contract manufacturer for the supply of our final formulated products for human testing for clinical trials. All of our contract manufacturers are experienced in manufacturing synthetic siRNA under current good manufacturing practices. Over time, we intend to establish long term commercial supply agreements with our contract manufacturers. The commercial manufacturers will be selected based on results of demonstration syntheses, regulatory track record, commercial manufacturing and control experience, staff experience, training and skill, intellectual property considerations and price.

Pfizer will be responsible for manufacturing all product candidates for preclinical and clinical development and for commercial supply under our agreement, except for our planned Phase IIb study of PF-655 in diabetic macular edema, for which we will be responsible for procuring clinical supply of PF-655.

Intellectual Property

We place considerable importance on obtaining patent protection for our technologies, product candidates and processes, maintaining and defending our intellectual property estate and making every effort in ensuring that we and our sublicensees have the necessary freedom to operate in the siRNA space. Our policy is to seek patent protection for the inventions that we consider important to the development of our business. We intend to continue using our scientific expertise to develop new technologies, siRNA compounds, uses, methods and compositions and to pursue patent protection for these inventions to enhance our intellectual property position in the areas that are important to the development of our business.

As of January 31, 2011, we own or control through exclusive licenses 79 issued and 2 allowed patents in the United States and elsewhere in the world and approximately 140 patent applications filed as PCT international patent applications, applications in the United States and in 29 other jurisdictions. In addition, we hold non-exclusive licenses to 32 patents that were granted in United States and in 9 other jurisdictions and to 58 patent applications that are pending in the United States and in 14 other jurisdictions (including patents and patent applications relating to RNAi technology that may be relevant to some of our Clinical Products). Our patents for the PF-655 and QPI-1002 drug candidates (some of which were already granted and some if which are still pending) will expire in 2025 or later if the patent term is adjusted (in the United States) or extended in jurisdictions that grant patent term extension (such as the United States, Europe, Israel, Japan and others). Most of our siRNA technology patents and pending patent applications (if and when granted) will expire after 2027. Our patents for the QPI-1007 drug candidate (if and when granted) will expire in 2029 or later. The patents and pending patent applications, if and when granted, on siRNA technology in-licensed from Atugen AG (now Silence Therapeutics) will expire in 2023. The expiration dates discussed in this paragraph, relate to the United States and other major countries/jurisdictions. The patent expiration dates provided do not take into consideration any patent term extensions that may be granted under the Patent Term Restoration Act in the United States or the Supplementary Protection Certificate in the European Union, or in other countries including Australia, Japan, Korea and Israel, which would extend patent term taking into consideration time lost during the regulatory approval process.

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Even if we are granted patents by government authorities or obtain them through licensing, there can be no assurance that our patents will provide significant protection, competitive advantage or commercial benefit. The validity and enforceability of patents issued to pharmaceutical and biotechnology companies has proven highly uncertain. Legal considerations surrounding the validity of patents in the fields of pharmaceuticals and biotechnology are in transition, and we cannot assure you that the historical legal standards surrounding questions of validity will continue to be applied or that current defenses relating to issued patents in these fields will be sufficient in the future. In addition, we cannot assure you as to the degree and range of protections any of our patents, if issued, may afford us or whether patents will be issued. For example, patents which may issue to us may be subjected to further review by government authorities that may ultimately result in the reduction of their scope of protection, and pending patent applications may have their requested breadth of protection significantly limited before being issued, if issued at all. Further, since publication of discoveries in scientific or patent literature often lags behind actual discoveries and since publication of patent applications occur only after 18 months from the date of filing of the priority application, we cannot assure you that we were the first to invent subject matter covered by our pending patent applications, or that we were the first to file patent applications for these inventions.

Many pharmaceutical and biotechnology companies and university and research institutions have filed patent applications or have received patents in our areas of product development. Many of these entities’ applications, patents and other intellectual property rights could limit the scope of our patent claims or even prevent us from obtaining patents or could call into question the validity of any of our patents, if issued, or could otherwise adversely affect our ability to develop, manufacture or commercialize our siRNA drug candidates. Many companies, universities and institutions have filed patent applications on particular aspects of RNAi technology. In the therapeutic field, there are different patent families concerning, among others, siRNAs of specific lengths and including in their structures specific modifications as well as delivery systems and uses of such siRNAs. There is considerable uncertainty in the RNAi-related intellectual property landscape stemming from the fact that the earliest filed patents are just being granted, and many are still in prosecution and the claims of these patent applications are still subject to change.

We have patents and pending patent applications claiming all our siRNA clinical stage drug candidates as composition of matter and for methods of therapeutic use. We have licenses from Silence under their patent family related to specific modifications pattern to the siRNA structure for the PF-655 and QPI-1002 drug candidates. Silence’s Australian patent, European patent and US patent have been granted. In relation to our QPI-1002 drug candidate we have, in addition, exclusive licenses from Dharmacon and from the Board of Trustees of the University of Illinois at Chicago (UIC) related to siRNA sequences and temporary inhibition of p53 gene respectively. One of the patents that relates to temporary inhibition of p53 gene and was licensed on exclusive basis from UIC’s, namely European Patent EP1143943, was opposed by Eleos Inc (in September, 2008). The claims of the EP1143943 patent are directed to use of reversible p53 inhibitors for reducing or eliminating side effects associated with cancer therapy. As such the EP1143943 patent does not cover any of our current therapeutic indications of interest. Our response to Eleos’ arguments and Auxliary request claims were filed at the EPO in June 2009. During the Oral Proceedings, which took place on December 8, 2010, the Opposition Division of the EPO decided to maintain the patent on the basis of Auxiliary Request II filed during the Oral Proceedings. This decision resulted in the maintenance of a broad claim directed to use of any type of reversible p53 inhibitor for reducing or eliminating p53-mediated damage to the hematopoietic system associated with cancer therapy. Both parties have the right to appeal the decision of the Opposition Division and final resolution of the opposition proceedings will likely take a number of years. We cannot assure you of the breadth of the claims that will remain in the EP1143943 patent or that the patent will not be revoked in its entirety.

Further, we are pursuing intellectual property rights related to RNAi technologies, including pending patent applications covering compositions of matter, methods of use, routes of delivery and novel modified siRNA structures.

We have also licensed from Alnylam certain patents in the siRNA space on a non-exclusive basis, including:

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International Patent Application WO 2001/36646 and corresponding patents and applications, known as the “Glover patent,” which claim RNAi uses in mammalian cells;

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International Patent Application WO 2000/044895 and corresponding patents and applications, known as the “Kreutzer-Limmer patent,” which claim therapeutic uses of double-stranded RNAi of specific lengths; and

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United States Patents 7056704 and 7078196, International Patent Application WO 2002/044321 and corresponding patents and applications, known as the “Tuschl patents,” which cover certain structural features of siRNAs.

RNA interference is a relatively new field that has generated much technology and accompanying Intellectual Property, including numerous patents and patent applications, which are held by third parties. These third party patents and patent applications claim many different compounds, compositions and methods relating to the development and commercialization of RNAi therapeutics. Since the majority of these patent applications are still pending in Patent Offices around the world, there is a great deal of uncertainty about which patents will be granted, where and when, and with which claims. These third party patents could make it difficult or impossible for us to develop products based on our Intellectual Property or based on patents that we have licensed in. We routinely screen the patent literature and, when we believe appropriate, enter into discussions with academic and commercial entities that hold patents or are pursuing patent applications on technology or processes that we may wish to license in order to engage in some of our activities.

However, we cannot assure you that these licenses, or any others that we may obtain for our product candidates, will be available on commercially reasonable terms, if at all, or that we will be able to develop alternative technologies if we cannot obtain licenses. Moreover, we are aware of currently pending patent applications that, if granted, might arguably cover our activities or product candidates, depending on the scope of claims allowed, if any, including patent applications owned by Merck & Co., Inc. Alnylam Pharmaceuticals, Isis Pharmaceuticals, Silence Therapeutics, Dharmacon, Sylentis S.A and others.

To protect our rights in any of our patents, present or future, or to protect other proprietary rights, we may need to litigate against infringing third parties, or avail ourselves of the courts or participate in hearings to determine the scope and validity of these patents or other proprietary rights. These types of proceedings are often costly and time-consuming, and we cannot assure you that we will undertake to participate in such proceedings or that the deciding authorities will rule in our favor. An unfavorable decision could allow third parties to use our technology without being required to pay us licensing fees or may compel us to license needed technologies to avoid infringing third-party patent and proprietary rights, which may or may not be available. Although we believe that we would have valid defenses to allegations that our current product candidates (if and when they become commercial products), production methods of commercial products and commercial activities infringe the intellectual property rights of third parties, we cannot be certain that a third party will not challenge our position in the future. Also, even if some of these activities were covered by a third party’s patent rights, we may be exempt from claims of infringement to the extent that our activities are pre-commercialization activities related to seeking regulatory approval for a product candidate. However, the precise scope of protection for pre-commercialization activities is uncertain in some jurisdictions and we cannot assure you that any defense would be successful. Further, this defense is only available for pre-commercialization activities, and could not be used as a defense for sale and marketing of any of our product candidates. There has been, and we believe that there will continue to be, significant litigation in the biopharmaceutical and pharmaceutical industries regarding patent and other intellectual property rights.

Accordingly, third parties could bring legal actions against us claiming we infringe their patents or proprietary rights, and seek monetary damages and/or to enjoin clinical testing, manufacturing and marketing of one or more of our products. If we become involved in any such litigation, it could consume a substantial portion of our resources, and cause a significant diversion of effort by our technical and management personnel regardless of the outcome of the litigation. If any of these actions were successful, in addition to any potential liability for damages, we could be required to obtain a license to continue to manufacture or market the affected product, in which case we may be required to pay substantial royalties or grant cross-licenses to our patents. Moreover, there can be no assurance that any such license will be available on acceptable terms or at all. Ultimately, we could be prevented from commercializing a product, or forced to

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cease some aspect of our business operations as a result of claims of patent infringement or violation of intellectual property rights of others, which could have a material and adverse effect on our business, financial condition and operations. Further, the outcome of intellectual property litigation is subject to uncertainties that cannot be adequately quantified in advance, including the demeanor and credibility of witnesses and the identity of the adverse party. This can be especially true in intellectual property cases that may turn on the testimony of experts as to technical facts upon which experts may reasonably disagree.

While we pursue patent protection for our product candidates and for various aspects of our technologies when appropriate, we also rely on trade secrets, know-how and continuing technological advancement to develop and maintain our competitive position. To protect this competitive position, we regularly enter into confidentiality and proprietary information agreements with third parties, including employees, licensees, collaborators and suppliers. Our employment policy requires, where appropriate, each new employee to enter into an agreement that contains provisions generally prohibiting the disclosure of confidential information to anyone outside of Quark and providing that any invention conceived by an employee within the scope of his or her employment duties is our exclusive property. Furthermore, our know-how that is accessed from third parties through licenses, collaborations and research and development contracts and through our relationships with scientific consultants is generally protected through confidentiality agreements. We cannot, however, assure you that these protective arrangements will be honored by third parties, including employees, consultants, licensees, collaborators and suppliers, or that these arrangements will effectively protect our rights relating to unpatented proprietary information, trade secrets and know-how. In addition, we cannot assure you that other parties will not independently develop substantially equivalent proprietary information and techniques or otherwise gain access to our proprietary information and technologies.

Government Regulation

The testing, manufacturing, and potential labeling, advertising, promotion, distribution, export and marketing of our product candidates are subject to extensive regulation by governmental authorities in the United States and in other countries. In the United States, the FDA, under the Federal Food, Drug and Cosmetic Act, or FDCA, and its implementing regulations, regulates pharmaceutical products. Failure to comply with applicable U.S. requirements may subject us to administrative or judicial sanctions, such as FDA refusal to approve pending applications for commercialization of products, withdrawal of approval for commercialized products, warning letters, untitled letters, product recalls, product seizures, total or partial suspension of production or distribution, injunctions, civil penalties and/or criminal prosecution.

Drug Approval Process

At the present time, we believe that our RNA interference-based product candidates will be regulated by the FDA as drugs under the jurisdiction of the FDA’s Center for Drug Evaluation and Research. To obtain FDA approval of a product candidate, we must, among other things, submit data supporting safety and efficacy as well as detailed information on the manufacture and composition of the product candidate and proposed labeling. The testing and collection of data and the preparation of necessary applications are expensive and time-consuming. The FDA may not act quickly or favorably in reviewing these applications, and we may encounter significant difficulties or costs in our efforts to obtain FDA approvals that could delay or preclude us from marketing our products.

The steps required before a drug may be approved for marketing in the United States generally include:

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preclinical laboratory tests and animal tests conducted in accordance with Good Laboratory Practices;

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submission to the FDA of an Investigational New Drug Application, or IND, for human clinical testing, which must become effective before human clinical trials commence;

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adequate and well-controlled human clinical trials conducted in accordance with Good Clinical Practices to establish the safety and efficacy of the drug product for each indication for which approval is being sought;

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the submission to the FDA of a New Dug application, or NDA;

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satisfactory completion of an FDA inspection of the manufacturing facilities at which the product is made to assess compliance with current good manufacturing practices;

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potential FDA inspection of the nonclinical and clinical trial sites that generated the data in support of the NDA; and

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FDA review and approval of the NDA, often after conclusion of an Advisory Committee of external experts concerning the NDA.

Preclinical studies may include laboratory evaluations of the product chemistry, toxicity, and formulation, as well as animal studies to assess the potential safety and efficacy of the product candidate. The conduct of the preclinical tests and formulation of the compounds for testing must comply with federal regulations and requirements. The results of the preclinical studies, together with manufacturing information and analytical data, are submitted to the FDA as part of the IND, which must become effective before clinical trials may be commenced. The IND will become effective automatically 30 days after receipt by the FDA, unless the FDA raises concerns or questions about the conduct of the clinical trials as outlined in the IND prior to that time. In this case, the IND sponsor and the FDA must resolve any outstanding concerns before clinical trials can proceed.

Clinical trials involve the administration of the product candidate to healthy volunteers or patients under the supervision of a qualified principal investigator. Clinical trials are conducted under protocols detailing the objectives of the study, the parameters to be used in monitoring safety, and the effectiveness criteria to be evaluated. Each protocol must be submitted to the FDA as part of the IND. Clinical trials must be conducted in accordance with the FDA’s good clinical practices requirements. Further, each clinical trial must be reviewed and approved by an independent institutional review board, or IRB, at or servicing each institution at which the clinical trial will be conducted. The IRB will consider, among other things, clinical trial design, patient informed consent, ethical factors, and the safety of human subjects. Continuing review and approval by the IRB is required at least annually. The FDA may order the partial, temporary or permanent discontinuation of a clinical trial at any time or impose other sanctions if it believes that the clinical trial is not being conducted in accordance with FDA requirements or presents an unacceptable risk to the clinical trial subjects. The IRB may also require the clinical trial at that site to be halted, either temporarily or permanently, for failure to comply with the IRB’s requirements, or may impose other conditions.

Clinical trials typically are conducted in three sequential phases prior to approval, but the phases may overlap. A fourth, or post-approval, phase may include additional clinical studies. These phases generally include the following:

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Phase I. Phase I clinical trials involve the initial introduction of the drug into human subjects, frequently healthy volunteers. These studies are designed to determine the metabolism and pharmacologic actions of the drug in humans, the adverse effects associated with increasing doses, and, if possible, to gain early evidence of effectiveness. In Phase I, the drug is usually tested for safety, including adverse effects, dosage tolerance, absorption, distribution, metabolism, excretion and pharmacodynamic properties.

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Phase II. Phase II clinical trials usually involve studies in a limited patient population to evaluate the biological activity, including initial efficacy, of the drug for specific, targeted indications, to determine dosage tolerance and optimal dosage, and to identify possible adverse effects and safety risks. Although there are no statutory or regulatory definitions for Phase IIa and Phase IIb, Phase IIa is commonly used to describe a Phase II clinical trial evaluating biological activity, including initial efficacy, adverse effects, and safety risks and Phase IIb is commonly used to describe a subsequent Phase II clinical trial that also evaluates dosage tolerance and optimal dosage.

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Phase III. If a compound is found to be potentially effective and to have an acceptable safety profile in Phase II (or sometimes Phase I) studies, the clinical trial program will be expanded to further demonstrate clinical efficacy, optimal dosage and safety within an expanded patient

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population at geographically dispersed clinical trial sites. Phase III studies usually include several hundred to several thousand patients. Generally, two adequate and well-controlled Phase III clinical trials are required by the FDA for approval, but for some product candidates, only one Phase III trial may be required.

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Phase IV. Phase IV clinical trials are studies required of or agreed to by a sponsor that are conducted after the FDA has approved a product for marketing. These studies are used to gain additional experience from the treatment of patients in the intended therapeutic indication and to document a clinical benefit in the case of drugs approved under accelerated approval regulations. If the FDA approves a product while a company has ongoing clinical trials that were not necessary for approval, a company may be able to use the data from these clinical trials to meet all or part of any Phase IV clinical trial requirement. These clinical trials are often referred to as Phase III/IV post approval clinical trials. Failure to promptly conduct Phase IV clinical trials could result in withdrawal of approval for products approved under accelerated approval regulations.

The applicant must submit to the FDA the results of the preclinical and clinical trials, together with, among other things, detailed information on the manufacture and composition of the product candidate and proposed labeling, in the form of an NDA, including payment of a user fee. The FDA reviews all NDAs submitted before it accepts them for filing and may request additional information rather than accepting an NDA for filing. Once the submission is accepted for filing, the FDA begins an in-depth review of the NDA. Under the goals and policies agreed to by the FDA under the Prescription Drug User Fee Act, or PDUFA, the FDA has ten months in which to complete its initial review of a standard NDA and respond to the applicant, and six months to complete its review of a priority NDA. The FDA does not always meet its PDUFA goal dates for standard and priority NDAs. The review process and the PDUFA goal date may be extended by three months if the FDA requests or the NDA sponsor otherwise provides additional information or clarification regarding information already provided in the submission within the last three months before the PDUFA goal date. If the FDA’s evaluations of the NDA and the clinical and manufacturing procedures and facilities are favorable, the FDA will issue an approval letter. If there are certain issues or concerns that need to be addressed prior to the agency’s ability to approve the NDA, the FDA’s response to the applicant will take the form of a Complete Response letter, which contains the conditions that must be met in order to secure final approval of the NDA. If and when those conditions have been met to the FDA’s satisfaction, the FDA will issue an approval letter, authorizing commercial marketing of the drug for certain indications. Sponsors that receive a complete response letter may submit to the FDA information that represents a response to the issues identified by the FDA. Such resubmissions are classified under PDUFA as either Class 1 or Class 2. The classification of a resubmission is based on the information submitted by an applicant in response to an action letter. Under the goals and policies agreed to by the FDA under PDUFA, the FDA has two months to review a Class 1 resubmission, and six months to review a Class 2 resubmission. The FDA may also refer an application to the appropriate advisory committee, typically a panel of clinicians, for review, evaluation and a recommendation as to whether the application should be approved. The FDA is not bound by the recommendations of the advisory committee.

The FDA has various programs, including fast track, priority review, and accelerated approval (Subpart H), that are intended to facilitate the development and expedite the review of certain drugs, and/or provide for approval on the basis of surrogate endpoints. Generally, drugs that may be eligible for one or more of these programs are those for serious or life-threatening conditions, those with the potential to address unmet medical needs, and those that provide meaningful benefit over existing treatments. We cannot be sure that any of our drug candidates will qualify for any of these programs, or that, if a drug does qualify, that the review time will be shorter than a standard review.

After approval, certain changes to the approved product, such as adding new indications, making certain manufacturing changes, or making certain additional labeling claims, are subject to further FDA review and approval. Obtaining approval for a new indication generally requires that additional clinical studies be conducted. We cannot be sure that any additional approval for new indications for any product will be approved on a timely basis, or at all.

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After a drug has been approved by the FDA for sale, the FDA may require that certain post-approval requirements be satisfied, including the conduct of additional clinical studies or compliance with a Risk Evaluation and Mitigation Strategy, or REMS. If such post-approval conditions are not satisfied, the FDA may withdraw its approval of the drug. In addition, holders of an approved NDA are required to:

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report certain adverse reactions to the FDA;

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submit annual and periodic reports summarizing product information and safety data;

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comply with certain requirements concerning advertising and promotional labeling for their products; and

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continue to have quality control and manufacturing procedures conform to current good manufacturing practices after approval.

The FDA periodically inspects the sponsor’s records related to safety reporting and/or manufacturing facilities, including assessment of compliance with current good manufacturing practices. Accordingly, manufacturers must continue to expend time, money, and effort in the area of production and quality control to maintain current good manufacturing practices compliance. Discovery of problems with a product after approval may result in restrictions on a product, manufacturer, or holder of an approved NDA, including withdrawal of the product from the market.

Other Regulatory Requirements

We are subject to a variety of foreign regulations governing clinical trials and the marketing of any potential products. Outside of the United States, our ability to market any products we may develop depends upon receiving a marketing authorization from the appropriate regulatory authorities. The requirements governing the conduct of clinical trials, marketing authorization, pricing and reimbursement vary widely from country to country. In any country, however, we will only be permitted to commercialize our products if the appropriate regulatory authority is satisfied that we have presented adequate evidence of safety, quality and efficacy. Whether or not FDA approval has been obtained, approval of a product by the comparable regulatory authorities of foreign countries must be obtained prior to the commencement of marketing of the product in those countries. The time needed to secure approval may be longer or shorter than that required for FDA approval. The regulatory approval and oversight process in other countries includes all of the risks associated with regulation by the FDA and certain state regulatory agencies as described above.

Employees

As of February 28, 2011, we had 97 employees, 71 of whom were engaged directly in research and development, 22 in general administrative and marketing activities, and 4 in regulatory, clinical affairs and quality activities. None of our employees is covered by a collective bargaining agreement, and we consider our relationship with our employees to be good.

Facilities

Our corporate headquarters are located in Fremont, California, where we occupy approximately 5,540 square feet of office space. The annual lease payments for our corporate headquarters building are approximately $95,000, and the fixed-term lease expires May 31, 2011. Our research and development facility is located in Ness Ziona, Israel, where we occupy approximately 23,110 square feet of office and laboratory space. The annual lease payments for this space are approximately $412,000. The fixed-term lease expired June 13, 2010, after which we may extend the term for an additional year. We also have an office in Boulder, Colorado, where we occupy approximately 9,494 square feet. The annual lease payments are approximately $183,000 and the fixed terms lease expire on December 31, 2011.

Legal Proceedings

We are not currently involved in any material legal proceedings. However, litigation is common in the biopharmaceutical industry, and we may become involved in material legal proceedings in the future.

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MANAGEMENT

Executive Officers and Directors

The following table sets forth information regarding our executive officers and directors, including their ages and positions, as of February 28, 2011:


Name	Age	Position(s)
Daniel Zurr, Ph.D.	67	President, Chief Executive Officer and Director
Sagit Reich, CPA (Isr)	36	Chief Financial Officer
Rami Skaliter, Ph.D.	52	Chief Operating Officer
Shai S. Erlich, Ph.D.	44	Chief Medical Officer
Elena Feinstein, M.D., Ph.D.	51	Chief Scientific Officer
Juliana Friedmann, M.Sc.	59	Senior Vice President, Strategy & Planning
Philip B. Simon, Chairman	58	Chairman of the Board of Directors
Philip M. Hahn	68	Director
Yoshitaka Kitao	59	Director
Toshihiro Toyoshima	48	Director
Robert Takeuchi	54	Director

Daniel Zurr, Ph.D. has served as our President, Chief Executive Officer and a member of our Board of Directors since he founded Quark in 1993. Prior to joining Quark, from 1984 to 1993, Dr. Zurr served as vice president for corporate business development for Israel Chemicals, Ltd. From 1980 to 1983, Dr. Zurr served as the director of licensing at G.D. Searle, a specialty pharmaceutical company. Dr. Zurr was the chief executive officer of Plantex-Ikapharm, a pharmaceutical company, from 1972 to 1980. Dr. Zurr obtained his M.Sc. at the Hebrew University of Jerusalem and his Ph.D. from Imperial College, University of London. Dr. Zurr’s experience in prior pharmaceutical companies as well as his experience as a founder of Quark and his tenure with Quark brings industry experience, historic company knowledge as well as continuity to the Board of Directors.

Sagit Reich, CPA (Isr) has served as our Chief Financial Officer since she joined Quark in August 2010. Prior to joining Quark, Ms. Reich worked at the accountancy firm of Ernst &Young, Israel, as Senior manager of public and private companies specializing in the hi-tech industry from 2000 until July 2010. Ms. Reich is licensed Israeli CPA and holds a B.A. in Accounting and Psychology from Tel Aviv University.

Rami Skaliter, Ph.D. has served as our Chief Operating Officer since January 2007. Dr. Skaliter joined Quark in 1995. He has served in various executive positions, including Executive Vice President of Research & Development. Dr. Skaliter obtained his B.Sc. in Biology at the Ben-Gurion University of the Negev, and both his M.Sc. and Ph.D. in Biochemistry at the Weizmann Institute of Science. Between 1993 and 1995, Dr. Skaliter completed his post-doctoral fellowship at Stanford University.

Shai S. Erlich, Ph.D. has served as our Chief Medical Officer since January 2008.Dr. Erlich joined Quark in 1999. He has served in various executive positions, including Senior Vice President of Pharmaceutical Development, from May 2004 to January 2007, Senior Director of Portfolio Management from May 2002 to May 2004 and Director of Product Development Strategic Planning from April 2000 to May 2002. Dr. Erlich obtained his B.Sc. in the medical sciences at the Ben-Gurion University of the Negev, and holds an M.Sc. in Human Genetics in the field of Cancer Genetics from Tel Aviv University, and a Ph.D. in Gene Therapy from Mount Sinai School of Medicine.

Elena Feinstein, M.D., Ph.D. has served as our Chief Scientific Officer since June 2007. Dr. Feinstein joined Quark in 1998 and has served in various executive positions, including Senior Vice President of Research, Vice President of Technology Development and Vice President of Research from 2001 to 2002. Prior to joining Quark, Dr. Feinstein worked from 1985 until 1997 at the Weizmann Institute of Science as a doctoral fellow, post-doctoral fellow, scientist and senior staff scientist. Dr. Feinstein obtained her M.D. from the 2nd Moscow Medical Institute (Moscow Medical University) and completed her Ph.D. in Chemical Immunology at the Weizmann Institute of Science.

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Juliana Friedmann, M.Sc. has served as our Senior Vice President of Strategy and Planning since 2007.Ms. Friedmann joined Quark in 1998. Ms. Friedmann served as our Vice President of Marketing and Business from February 1998 until May 2007. From 1983 until 1998, Ms. Friedmann worked at Dead Sea Bromine, part of Israel Chemicals Ltd., holding a number of progressively senior positions. Previously Ms. Friedmann worked as a patent attorney in Italy. Ms. Friedmann received both her B.S. in Chemical Engineering and her M.Sc. from Ben-Gurion University of the Negev.

Philip B. Simon, CPA has served as a member of our Board of Directors since August 1997. Mr. Simon is a partner of Howson & Simon LLP and the president of Lawrence Investments, LLC, one of Quark’s major investors. Mr. Simon serves on the boards of directors of LeapFrog Enterprises, Inc., as well as on the boards of several private companies affiliated with Lawrence Investments, and formerly served on the board of directors of Spring Group plc, a publicly traded United Kingdom company. Mr. Simon joined Lawrence Investments in 1997. Mr. Simon has worked for 29 years as a partner at Howson & Simon. Mr. Simon holds an A.B. from Yale University and a J.D. from Stanford Law School. He is a member of the California Society of Certified Public Accountants. Mr. Simon’s executive and finance experience and his tenure as a director of Quark brings executive and finance experience, historic company knowledge as well as continuity to the Board of Directors.

Philip M. Hahn has served as a member of our Board of Directors since August 2008. He retired from Pfizer, Inc. in 2008 as Vice President and Assistant General Counsel and worked continuously at Pfizer in various positions from 1978 to 2008. Mr. Hahn has extensive experience in structuring, negotiating and drafting major licenses and collaborations with U.S. pharmaceutical and biotech companies, as well as European and Japanese companies and broad experience in pharmaceutical and medical device businesses, including research, development, manufacturing and commercialization of products in U.S. and in foreign markets. Mr. Hahn is also knowledgeable in the areas of commercial, patent, anti-trust, bankruptcy, food and drug, and licensing law. Mr. Hahn is a member of the Bar of the City of New York, New York State Bar Association and has been a lecturer and panel expert at various programs conducted by the American Conference Institute and the New York City Bar Association. He is also a member of the Board and Executive Committee of the New York Region of the Anti-Defamation League. Mr. Hahn holds an A.B. magna cum laude from Brown University, an L.L.B. from Yale Law School and is fluent in French. Mr. Hahn’s experience with other pharmaceutical and biotech companies in the development and commercialization of products in the U.S. and foreign markets brings industry experience and knowledge to the Board of Directors.

Yoshitaka Kitao has served as a member of our Board of Directors since June 2010.He has served as the Chief Executive Officer and Representative Director of SBI Holdings, Inc., SBI Investment Co., Ltd., SBI Capital Co., Ltd. and SBI Card Co., Ltd., and the Chief Executive Officer and Director of SBI VeriTrans Co., Ltd. and Morningstar Japan K.K. He is the Chairman and Director of SBI Mortgage Co., Ltd., Gomez Consulting Co., Ltd. and SBI Securities Co., Ltd. He is the Representative Director of Wall Street Journal Japan K.K. and Director of SBI Benefit Systems Co., Ltd. He was Executive Vice President and Chief Financial Officer of SOFTBANK Corp. from 1995 to 2000 and a Director of SOFTBANK Corp. from 2000 to 2005. He was the Chief Executive Officer and Representative Director of SOFTBANK Finance Corporation from 1999 to 2005. Previously, Mr. Kitao was also the Director of Nomura Wasserstein Perella Co., Ltd. from 1991 to 1992, Managing Director of Wasserstein Perella & Co. International, Limited from 1989 to 1992 and was the General Manager for the Nomura Securities Co., Ltd.’s Corporate Finance and Services Dept. III from 1992 to 1995. Mr. Kitao obtained degrees in Economics from Keio University in 1974 and Cambridge University in 1978. Mr. Kitao’s experience brings management and finance knowledge and expertise to the Board of Directors.

Toshihiro Toyoshima has served as a member of our Board of Directors since August 2010. Mr. Toyoshima is Chief Executive Officer of Asuka DBJ Partners Co., Ltd., an investment management company with approximately $860 million in assets under management, formed in 2005 as a joint venture between Development Bank of Japan, Inc. and Asuka Asset Management Co., Ltd. Before joining Asuka DBJ Partners, Mr. Toyoshima was the director-general of the Planning Department for Investment Banking of the Development Bank of Japan from October 2004 after working as a senior specialist in charge of the private sector at the World Bank and working in the Planning Department and the Project Finance Department of the Development Bank of Japan. Mr. Toyoshima introduced the concept of project finance and DIP finance to

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Japan, and arranged a wide range of notable transactions such as Nakayama Joint Power Generation, Universal Studio Japan, Shinko Kobe Power Station of Kobe Steel, Ltd., Kazusa Clean System, and Fukuoka Clean Energy, each of which won the Asia Pacific Deal of the Year Award of the International Project Finance magazine. At the World Bank, Mr. Toyoshima was responsible for the privatization of state-owned enterprises in Botswana, Gambia, Lesotho, and Ethiopia. Mr. Toyoshima supervised the bidding for the privatization of Lesotho Electric Company, the foundation of Gambia Utility Regulatory Agency, and the coordination of the Asian-African trade and investment strategy (part of the Afro-Asian Conference). Since 2005, Mr. Toyoshima has engaged in equity investments of over $1 billion, focusing on unique growth opportunities, businesses with cross-border potentials and with disruptive concepts, part of which investments are listed on eight stock markets across five countries. Mr. Toyoshima holds a B.A. in law from the University of Tokyo and master’s degrees in real estate and urban planning from the Massachusetts Institute of Technology. Mr. Toyoshima’s investment and finance experience with respect to corporate development and growth opportunities brings investment and finance experience and knowledge to the Board of Directors.

Robert Takeuchi has served as a member of our Board of Directors since July 2010. He is currently a director of SBI Investment Co., Ltd. a private equity investment company. From 2004 until the present, Mr. Takeuchi served as president of RT Consulting, Inc. From 1996 to 2004 he was President of SOFTBANK Finance, America Corporation and from 1988 to 1996 he was a Director of CS First Boston. Mr. Takeuchi obtained a B.A. in Economics from the University of California, Los Angeles in 1979. Mr. Takeuchi’s private equity investment and finance experience brings private equity and finance experience and knowledge to the Board of Directors.

Board Composition

Our board of directors currently consists of six members. Directors are elected for a one-year term each year at our annual meeting of shareholders. Under California law, our directors may be removed by the affirmative vote of the holders of a majority of our voting stock.

Director Independence

We are not listed as an issuer, nor have we applied to be listed as an issuer, on any U.S. national securities exchange or inter-dealer quotation system. For purposes of compliance with applicable securities rules, the independence standards required by the Nasdaq Stock Market, Inc. are described below.

Under Nasdaq’s rules, an independent director is a person other than an executive officer or employee of the company or any other individual having a relationship which, in the opinion of the company’s board of directors, would interfere with the exercise of independent judgment in carrying out the responsibilities of a director. Under Nasdaq Rule 5605(a)(2), a director is not considered independent if: (i) the director was employed by the company or its subsidiaries or parent company during the preceding three years; (ii) the director received, or had a family member that received, compensation in excess of $120,000 from the company during any twelve month period during the preceding three years (other than for board or committee services, benefits under a retirement plan or payments to a family member who is a non-executive employee of the company); (iii) the director had a family member that was an executive officer of the company during the preceding three years; (iv) the director received from, either directly or through family members or entities under his control, or the company received from any such person, during the current and three preceding years, any property or services totaling the greater of $200,000 or 5% of the recipient’s gross revenues for that year, unless the payments arose from investments in the company’s securities or a non-discretionary charitable contribution matching program; (v) the director was employed, or has a family member who was employed, during the last three years, as an executive officer of another company where any of the issuer’s executive officers serve on the compensation committee; or (vi) the director is, or has a family member who is, a partner at the company’s outside auditor or was a partner or employee of the company’s outside auditor who worked on the company’s audit at any time during the preceding three years. Ownership in a company does not by itself disqualify a director from being independent.

Under Nasdaq rules, at least a majority of the members of a listed company’s board of directors must be independent. We have determined that Messrs. Simon, Hahn, Kitao, Toyoshima and Takeuchi are independent under Nasdaq rules and, as a result, we currently comply with the Nasdaq director independence standards.

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Nasdaq requires listed companies to appoint an audit committee of at least three members and adopt an audit committee charter describing the committee’s responsibilities. All directors on the audit committee must be independent, determined in accordance with the definition described above and under Rule 10A-3(b)(1) of the Exchange Act, subject to the exemptions set forth therein. Under an exemption to Rule 10A-3(b)(1), at least one member of Quark’s audit committee must be independent during the 90-day period beginning on the effective date of the registration statement, and during the one-year period beginning on the effective date of the registration statement, a minority of the audit committee is exempt from the requirements of Rule 10A-3(b)(i). Quark’s audit, nominating and corporate governance committee, which combines audit committee and corporate governance functions, as required by Israeli law, in addition to the nominating function, is currently comprised of two independent directors under the Nasdaq rules and the Exchange Act.

Nasdaq does not require listed companies to have either a compensation committee. If the board chooses to constitute any such committee, however, the committee must be comprised of independent directors.

Director Independence Under Israeli Law

To list our securities on TASE, we will need to comply with certain director independence requirements under Israeli law within three months after the initial listing of our securities on TASE. Pursuant to Sections 239 through 249A of the Israel Companies Law — 1999, or the Israeli Companies Law, our board of directors will need to include at all times at least two directors who are elected by shareholders where at least one of the following is true: (i) the majority of the votes represented at the shareholders’ meeting includes at least one-third of all of the votes of the shareholders who are not holders of control in the corporation and who participate in the voting (with abstentions not being included in the total votes of the foregoing shareholders); or (ii) the total of opposing votes from among the shareholders referenced in subsection (i) does not exceed 1% of all of the voting rights in the corporation. Directors elected in accordance with this provision are deemed to be “outside directors.”

For purposes of this provision, “control” is defined in the Israeli Companies Law as the ability to direct the activity of the corporation, excluding an ability deriving merely from holding an office of director or another office in the corporation, and a person shall be presumed to control a corporation if he holds 50% or more of the means of control of the corporation such as the right to vote at a general meeting or a corresponding body of the corporation or the right to appoint directors or the chief executive officer of the corporation. If at the time of the appointment of an outside director, all of the members of the board of directors are of one gender, the second outside director shall be of the other gender.

Any vacancy in the office of an outside director may be filled only by the shareholders and may not be filled by the remaining directors. If at any time there are fewer than two outside directors, the board of directors must call a special shareholders’ meeting for the election of outside directors. An outside director may not be removed from office without cause. An outside director is required to be a resident of the State of Israel, unless Quark lists its securities on a stock exchange outside of Israel, in which case our shareholders may elect outside directors who are not Israeli resident.

An outside director must have professional qualifications or accounting and financial expertise, and at least one of the outside directors must have accounting and financial expertise, as determined in accordance with Israeli law.

No individual may be appointed as an outside director if, at the time of appointment or at any time during the preceding two years, he, his relative, partner, employer or a corporate body of which he is a controlling party had a connection to the corporation, to a person who was a controlling party of the corporation at the time of the appointment, or to another corporate body. For the purposes of this provision, (i) “connection” means an employment relationship, commercial or professional ties in general or control, as well as service as an officer, other than service as a director who was appointed as an independent director in a corporation that is due to offer shares to the public for the first time, and (ii) “other corporate body” means a corporate body in which the corporation or controlling member of it is a controlling member at the time of the appointment or during the two years before the time of appointment.

A director in a corporation cannot be appointed as an outside director in another corporation if at that time a director of the other corporation serves as an outside director of the first corporation. An outside

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director may not receive any compensation from the corporation, except as determined by applicable law and except for insurance coverage and indemnification set forth in the corporation’s bylaws or as determined by other applicable law. An individual cannot be appointed as an outside director if he holds any other position or owns any business which might give rise to a conflict of interest with his role as a director, or if such circumstances might harm his ability to act as a director. An individual cannot be appointed as an outside director if he is a member of the Israel Securities Authority or an employee thereof, or if he is a member of the board of directors or an employee of an Israeli stock exchange.

A general meeting of our shareholders at which the appointment of an outside director is on the agenda may only be convened if the nominee has declared that he fulfills the conditions required for being appointed as an outside director.

Each committee of our Board of Directors authorized to exercise any of the powers of our Board of Directors must include at least one outside director.

Under the TASE requirements, the term of office of an outside director is to be three years, and a company may appoint an incumbent independent director for one additional term of three years. If our Board of Directors learns of a circumstance under which an outside director no longer meets the condition required under the applicable law for his appointment, or that he has violated his fiduciary duty, the Board of Directors shall discuss the matter at the meeting first convened after it learned of the matter. If our Board of Directors determines that the outside director no longer meets a condition required under applicable law for his appointment or that he has violated his fiduciary duty, then the Board must call a special meeting of our shareholders for the removal of that outside director. The reasons for removal of the outside director must be presented by our Board at the meeting of our shareholders, and the outside director must be given a reasonable opportunity to present his position. The decision of our shareholders to terminate an outside directors’ term of office must be adopted with the same majority that was necessary for his appointment.

An Israeli court may, pursuant to the application of a director or shareholder, order the removal of an outside director if it determines that the director has ceased to fulfill one of the conditions required under the Israeli Companies Law for his appointment, or that he has committed a breach of a fiduciary duty to the corporation.

For a period of two years following the termination of an outside director, a corporation may not directly or indirectly enter into any employment, consulting or other arrangement for fees with such person, and such person may not serve as a director or officer of the corporation, including a corporation controlled by such person.

Pursuant to Sections 95 and 121(c) of the Israeli Companies Law, we will be subject to certain other procedural and board composition requirements. A director that holds the office of chairman of the board of directors may not also hold the office, or be granted the powers of, the chief executive officer, unless authorized in accordance with Section 121(c) of the Israeli Companies Law. Section 121(c) provides that the shareholders at a meeting of shareholders of a public company may resolve that for a period of no more than three years the chairman of the board of directors may be authorized to fulfill the duties of the chief executive officer, provided that, in counting the votes at the meeting at least one of the following is true: (i) the majority must include at least two-thirds of the shareholders who are not holders of control in the corporation present at the vote and abstaining votes must not be taken into account in counting the votes of such shareholders; or (ii) the total of opposing votes from among the shareholders referenced in subsection (i) does not exceed 1% of all of the voting rights in the corporation.

Board Committees

Audit, Nominating and Corporate Governance Committee

Our audit, nominating and corporate governance committee combines audit and corporate governance functions, as required by Israeli law, in addition to the nominating function, into one committee. Our audit, nominating and corporate governance committee consists of Messrs. Hahn and Toyoshima. The position of chair of our audit, nominating and corporate governance committee is currently vacant. Within three months after the initial listing of our securities on TASE and after completion of this offering, once our shareholders

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have elected our outside directors, as required by Israeli law, the composition of our audit, nominating and corporate governance committee will include at least one outside director.

The functions of this committee include, among other things:

•

reviewing and pre-approving the engagement of our independent auditors to perform audit services and any permissible non-audit services;

•

evaluating the performance of our independent auditors and deciding whether to retain their services;

•

reviewing our annual and quarterly financial statements and reports and discussing the statements and reports with our independent auditors and management;

•

reviewing and approving related-party transactions;

•

reviewing with our independent auditors and management significant issues that may arise regarding accounting principles and financial statement presentation, as well as matters concerning the scope, adequacy and effectiveness of our financial controls;

•

establishing procedures for the receipt, retention and treatment of complaints received by us regarding financial controls, accounting or auditing matters;

•

developing and maintaining a current list of the functional needs and qualifications of members of our board of directors;

•

evaluating director performance on our board of directors and its applicable committees and determining whether continued service on our board of directors is appropriate for such director;

•

interviewing, evaluating, nominating and recommending individuals for membership on our board of directors;

•

reviewing and recommending to our board of directors the compensation arrangements for our non-employee directors, other than our outside directors, for whom compensation shall be determined in accordance with Israeli law;

•

evaluating nominations by shareholders of candidates for election to our board of directors;

•

reviewing and reporting annually to our board of directors an assessment of the board’s performance;

•

reviewing and recommending to our board of directors any amendments to our corporate governance documents;

•

reviewing and recommending to our board of directors changes with respect to corporate governance issues, issues of broad social significance and our overall conduct as a responsible corporate citizen; and

•

identifying defects in the Company’s corporate governance and business administration and making proposals to the Board regarding ways of correcting such defects.

Our board of directors has not determined that any of the members of our audit, nominating and corporate governance committee qualifies as an audit committee financial expert within the meaning of SEC regulations. Our board of directors has determined that we meet the independence requirements of Rule 10A-3 of the Exchange Act, subject to the exemptions set forth therein. Both our independent registered public accounting firm and management are expected to periodically meet privately with our audit, nominating and corporate governance committee.

Compensation Committee

We currently do not have a compensation committee in place. We plan to constitute a compensation committee after the initial listing of our securities on TASE and after completion of this offering. Within three months after the initial listing of our securities on TASE, once our shareholders have elected our outside directors, as required by Israeli law, the composition of our compensation committee will include at least one outside director. The functions of this committee shall include, among other things:

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•

determining the compensation and other terms of employment of our executive officers and senior management and reviewing and approving corporate performance goals and objectives relevant to such compensation;

•

evaluating and recommending to our board of directors the equity incentive plans, compensation plans and similar programs advisable for us, as well as modification or termination of existing plans and programs; and

•

reviewing and approving the terms of any employment agreements, severance arrangements, change-in-control protections and any other compensatory arrangements for our executive officers.

Each member of our compensation committee to be constituted after the initial listing of our securities on TASE and after completion of this offering, shall be a non-employee director as defined in Rule 16b-3 promulgated under the Securities Exchange Act of 1934, as amended, and shall be an outside director, as defined pursuant to Section 162(m) of the Internal Revenue Code of 1986, as amended.

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COMPENSATION DISCUSSION AND ANALYSIS

Overview and Objectives

We believe that compensation of our executive officers should focus executive behavior on the achievement of short-term corporate objectives as well as long-term business targets and strategies. It is the responsibility of the independent members of our board of directors to administer our executive compensation practices to ensure that they are competitive and include incentives designed to appropriately motivate executive performance. Tying short and long-term cash and equity incentives to the achievement of clearly identifiable corporate objectives promotes the dual goals of attracting and retaining the best possible executive talent while creating value for our shareholders by aligning their interests with those of our executive officers. While we intend to create an executive compensation program that is competitive with comparable public biotechnology companies, we remain committed to establishing compensation plans that link a proper portion of executives’ overall compensation to the attainment of our corporate performance milestones. We have chosen a mix of awards, both cash and equity, short-term and long-term, and seek to administer our compensation plans to strike a proper balance that advances company objectives, and fulfills our executives’ and shareholders’ expectations.

Our compensation programs for our named executive officers are designed to achieve the following objectives:

•

attract and retain talented and experienced executives to make us competitive in the pharmaceutical and biotechnology industry, where there is significant competition for talented employees;

•

motivate and reward executives whose knowledge, skills and performance significantly impact corporate results;

•

reward the achievement of specifically measured corporate goals and the individual contributions to the achievement of such goals;

•

incentivize management to achieve overall corporate objectives and to enhance shareholder value;

•

encourage increased team-work among all disciplines within the company; and

•

ensure fairness and promote stability among our executive management team.

As discussed in further detail below, our executive compensation program consists of the following three principal components:

Base Salary. Base salary for our executive officers is determined at commencement of employment and re-evaluated periodically. In determining whether to adjust an executive’s base salary, our board of directors takes such factors as company performance in prior years, individual performance, general economic factors and compensation equity among our executive officers, into consideration.

Bonuses. During 2010 we did not have a bonus plan or management incentive plan in place to offer incentive compensation to executive management and other key employees. Decisions regarding bonus payments to our executive management and other key employees are made by majority approval of the independent members of our board of directors. Dr. Zurr, our President and Chief Executive Officer, makes recommendations regarding executive compensation, however, Dr. Zurr does not participate in discussions regarding his own compensation.

Stock Option Grants. Our executive officers receive stock option grants as long-term incentives to ensure a portion of compensation is linked to our long-term success.

Our board of directors does not have any formal policies for allocating compensation among salary, bonus awards and stock option grants.

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Role of the Board of Directors in Setting Executive Compensation

As we did not have a Compensation Committee in place during our 2010 fiscal year, the independent members of our board of directors determined the salary, bonus awards and stock option grants for our executive officers. Dr. Zurr, our President and Chief Executive Officer, makes recommendations regarding executive compensation, however, Dr. Zurr does not participate in discussions regarding his own compensation. None of our other executive officers participate in discussions of our board of directors regarding executive compensation. Our board of directors has also delegated to Mr. Simon the authority to make compensation determinations, in consultation with Dr. Zurr, for executive officers other than the chief executive officer. Our board of directors has not historically engaged third-party consultants with respect to executive compensation matters, or relied on compensation data or surveys of peer companies. We do not believe that our compensation policies and practices, for either our executive or our non-executive employees, are reasonably likely to give rise to risks that would have a material adverse effect on us.

We discuss each of the primary elements of our executive compensation in greater detail below. While we have identified particular compensation objectives that each element of executive compensation serves, our compensation programs are designed to complement each other and collectively serve all of our executive compensation objectives described above.

Compensation Components

The components of our compensation program are as follows:

Annual Compensation

Base salary

The base salaries of all executive officers are reviewed periodically and adjusted to reflect individual roles and performance. We believe that a competitive base salary is a necessary element of any compensation program designed to attract and retain talented and experienced executives. We also believe that a periodic review of base salaries not only motivates and rewards executives for their overall performance, but creates a performance incentive going forward.

Bonuses

Our board of directors did not grant discretionary cash bonuses to our executive officers in 2010, except to our Chief Executive Officer, Dr. Zurr, in the total amount of $135,000. In 2010, we did not have a bonus plan or management incentive compensation plan in place. Decisions regarding discretionary bonus payments to our executive management and other key employees are made by majority approval of our board of directors, except that Dr. Zurr does not participate in discussions regarding his own compensation. The discretionary cash bonus paid to Dr. Zurr was in recognition of his service to Quark.

Long-term Incentives

Our salary and bonus programs are intended to compensate our executive officers for short-term performance. We also use equity incentives to reward long-term performance and to help align the interests of our executive officers with those of our shareholders. We believe that long-term performance is achieved through an ownership culture that rewards such performance by our executive officers through the use of equity incentives. Our current long-term incentives consist solely of stock option grants under our 1997 Stock Plan, which was terminated in March 2007, and 2007 Equity Incentive Plan. We believe the grant of stock options is a valuable retention tool and the best approach to achieve our compensation goals with respect to long-term compensation, and option grants currently provide tax and other advantages to our employees relative to other forms of equity compensation. We typically make grants of stock options to our executive officers on a periodic, but not necessarily annual, basis. The date of grant and the fair market value of the award are based upon the date of the board meeting at which the grant is approved. We typically make an initial award of stock options to new employees and periodic awards tied to vesting in prior grants or changes in responsibilities.

Stock option awards provide our executive officers with the right to purchase shares of our common stock at a fixed exercise price typically for a period of up to ten years, subject to continued employment with

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our company. Stock options are earned on the basis of continued service to us and grants made to new employees generally vest over four years, beginning with 25% vesting one year after the date of grant, then pro-rata vesting monthly thereafter. Since 2003, grants made to existing employees generally vest in equal monthly installments over four years. Our board of directors has the authority to determine the vesting schedule and may at times to adjust the vesting schedule for a particular award based on the individual employee’s circumstances. Stock option awards granted to employees who are residents of Israel are made under a sub-plan of our 2007 Equity Incentive Plan. Awards to residents of Israel are granted in trust to a trustee for the benefit of the named employee for certain tax reasons described in further detail below under the heading “— Tax Considerations.”

Our prior equity plan, the 1997 Stock Plan, was terminated in March 2007 when our board of directors adopted its replacement plan, the Quark Pharmaceuticals, Inc. 2007 Equity Incentive Plan. In May 2007, the plan was approved by our shareholders. The plan provides a mechanism to continue our practice of making equity awards to attract and retain talented employees. As of February 28, 2011, our board has approved option grants which are currently outstanding to purchase 2,610,274 shares of our common stock to certain of our employees, including our named executive officers. The plan is described in detail under “2007 Equity Incentive Plan” below. Our board is expected to continue to grant options to our employees to continue our philosophy of incentivizing long-term performance and aligning our executives’ interests with that of our shareholders.

The exercise price of each stock option granted under our 2007 Equity Incentive Plan is not less than the fair market value of our common stock on the date of grant. The fair market value of our common stock for purposes of determining the exercise price of stock options has been determined by our board of directors based on a number of factors applicable to common stock of privately-held companies including, among others, the results of third-party independent valuation reports, the total company valuation implied by the most recent venture capital round of financing, the market value of similarly situated public companies, our current and anticipated future risks and opportunities, the rights and preferences of our preferred stock existing at the time and the lack of a liquid market for our capital stock.

Additionally, we made a personal loan to our Chief Executive Officer in the principal amount of $157,000 in January 2008. The loan was granted to Dr. Zurr in exchange for a promissory note to repay the principal and interest within a fixed term. Under the note, we agreed to forgive the debt upon an initial public offering or upon entering into a significant collaboration or joint venture agreement with a major United States or European based pharmaceutical company. The note was forgiven in full by the Company in September 2010 in recognition of Dr. Zurr’s service to Quark.

Other Compensation

All of our executive officers are eligible for health benefits made generally available to other employees. We also have a 401(k) plan that all employees resident in the United States are eligible to participate in, including our named executive officers resident in the United States. The 401(k) plan is intended to qualify as a tax-qualified plan under Section 401(k) of the Internal Revenue Code. Employees contribute their own pre-tax compensation, as salary deductions. Contributions may be made up to plan limits, including “catch-up” contributions, subject to government limitations. The plan permits us to make discretionary matching contributions, subject to established limits. In 2010, we matched 100% of participant contributions up to four percent of eligible compensation. We plan to match participant contributions at this same level in 2011.

We do not believe it is necessary for the attraction or retention of management talent to provide the officers with a substantial amount of compensation in the form of perquisites. In 2010, we provided an allowance to our executive officers for automobile and gasoline expenses, cell phone use, internet and telephone connections for home office use and reimbursement for travel expenses and tax reimbursements. We believe these expenses are justified by the nature of our business operations. Our chief executive offices are located in Fremont, California, and our principal operations are located in Israel. Consistent with our past practices, we intend to continue to maintain our current benefits and perquisites for our executive officers. Our board of directors may revise, amend or add to our officers’ executive benefits and perquisites if deemed advisable.

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Tax Considerations

Grants made to Israeli employees are granted under Section 102(b)(2) of the Israel Income Tax Ordinance pursuant to which the options or the common stock issued upon their exercise must be allocated or issued to a trustee and be held in trust for two years following the date of grant of the options. Under Section 102, any tax payable by an employee from the grant or exercise of the options is deferred until the transfer of the options or ordinary shares by the trustee to the employee or upon the sale of the options or common stock and gains are subject to a capital gains tax of 25%.

Under ASC 718-10, we are required to estimate and record an expense for each award of equity compensation (including stock options) over the vesting period of the award. For the foreseeable future, our stock option program comprises the sole component of our long-term compensation program, and, therefore, we record the expense for each stock option award on an ongoing basis according to ASC 718-10. In the future we may consider the grant of restricted stock to our executive officers in lieu of stock option grants in light of the accounting impact of ASC 718-10 with respect to stock option grants and other considerations.

Section 162(m) of the Internal Revenue Code of 1986 limits our deduction for federal income tax purposes to not more than $1 million of compensation paid to certain executive officers in a calendar year. Compensation above $1 million may be deducted if it is “performance-based compensation.” Our board of directors has not yet established a policy for determining which forms of incentive compensation awarded to our executive officers shall be designed to qualify as “performance-based compensation.” To maintain flexibility in compensating our executive officers in a manner designed to promote our objectives, our board of directors has not adopted a policy that requires all compensation to be deductible. However, our board of directors intends to evaluate the effects of the compensation limits of Section 162(m) on any compensation it proposes to grant, and our board of directors intends to provide future compensation in a manner consistent with our best interests and those of our shareholders.

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Summary Compensation Table

The following table provides information regarding the compensation earned during the year ended December 31, 2010 by our Chief Executive Officer, principal financial officers, and three other most highly compensated executive officers at December 31, 2010 whose combined salary and bonus awards exceeded $100,000 during 2010. We refer to our Chief Executive Officer, principal financial officers, and these other executive officers as our “named executive officers” elsewhere in this prospectus.

Summary Compensation Table for Fiscal Year 2010



Name and Principal Position	Salary ($)		Bonus ($)		Stock Awards ($)		Option Awards ($)		Non-Equity Incentive Plan Compensation ($)		Change in Pension Value and Nonqualified Deferred Compensation Earnings ($)		All Other Compensation ($)			Total ($)
Daniel Zurr Chief Executive Officer	$	322,347	$	135,000		—	$	81,472		—		—	$	289,264	⁽¹⁾	$	828,083
Sagit Reich Chief Financial Officer⁽²⁾	$	68,042		—		—		26,065		—		—	$	27,319		$	121,426
Smadar Samira Shakked Senior Vice President, Business Development, Finance	$	152,542		—		—	$	95,650		—		—	$	73,651	⁽³⁾	$	321,843
Shai Erlich Chief Medical Officer	$	300,167		—		—	$	96,065		—		—	$	48,882	⁽⁴⁾	$	445,114
Elena Feinstein, Chief Scientific Officer	$	199,009		—		—	$	71,070		—		—	$	75,658	⁽⁵⁾	$	345,737
Rami Skaliter Chief Operating Officer	$	218,481		—		—	$	75,012		—		—	$	93,602	⁽⁶⁾	$	387,095
Juliana Friedmann, Senior Vice President, Strategy and Planning	$	136,300		—		—	$	65,444		—		—	$	74,027	⁽⁷⁾	$	275,771

The amounts listed above were paid to the named executive officers in NIS, and the amounts above were converted from NIS to U.S. dollars, based on the annual average exchange rate.

In August 2009, our Board of Directors adopted a cost reduction plan that includes reduction of a certain percentage of each employee’s salary, up to 20%, beginning on September 1, 2009, for a period of 6 months, until March 1, 2010. The aggregate reduction of compensation in that six-month period amounted to $595,000 across all employees; the aggregate reduction of compensation during the period beginning on January 1, 2010 until March 1, 2010 amounted to $396,667 across all employees. The amounts listed on the table above reflect compensation of our named executive officers after giving effect to the reduction in salary during the period beginning on January 1, 2010 until March 1, 2010. Our board further approved that in certain future events, the employees will be reimbursed for such reductions. During the fiscal year 2010, an aggregate of $150,000 was paid to all employees whose salaries had been reduced.

(1)

Amount includes loan forgiveness of $156,919, $45,721 paid for health and welfare benefits for Dr. Zurr, including a manager’s insurance policy, disability, and an education fund; $28,070 provided by the Company as a vehicle and gasoline allowance; $2,644 for internet and telephone reimbursement to maintain a home office; $36,995 for cell phone reimbursement; $1,891 for professional tax preparation fees; $17,024 for gross-up payments for vehicle taxes. The aggregate incremental cost of the perquisites set forth in the table above is computed based on the actual expenses incurred by the company.

(2)

Sagit Reich, our Chief Financial Officer, joined Quark in August 2010. Amount includes $18,763 paid for health and welfare benefits for Ms. Reich, including a manager’s insurance policy, disability, and an education fund; $4,205 provided by the Company as a vehicle and gasoline allowance; $559 for cell

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phone reimbursement; $3,792 for gross-up payments for vehicle taxes. The aggregate incremental cost of the perquisites set forth in the table above is computed based on the actual expenses incurred by the company.

(3)

Amount includes $43,627 paid for health and welfare benefits for Ms. Shakked, including a manager’s insurance policy, disability, and an education fund; $15,459 provided by the Company as a vehicle and gasoline allowance; $1,092 for phone expenses; $13,473 for gross-up payments for vehicle taxes. The aggregate incremental cost of the perquisites set forth in the table above is computed based on the actual expenses incurred by the company.

(4)

Amount includes $46,223 paid for health and welfare benefits for Dr. Erlich, including 401(k) retirement plan contribution, life and disability insurance, and $2,659 for cell phone reimbursement. The aggregate incremental cost of the perquisites set forth in the table above is computed based on the actual expenses incurred by the company.

(5)

Amount includes $54,288 paid for health and welfare benefits for Ms. Feinstein, including a manager’s insurance policy, disability, and an education fund; $11,508 provided by the Company as a vehicle and gasoline allowance; $45 for internet and telephone reimbursement to maintain a home office; $9,817 for gross up payments for vehicle taxes. The aggregate incremental cost of the perquisites set forth in the table above is computed based on the actual expenses incurred by the company.

(6)

Amount includes $62,470 paid for health and welfare benefits for Dr. Skaliter, including a manager’s insurance policy, disability, and an education fund; $12,971 provided by the Company as a vehicle and gasoline allowance; $7,812 for cell phone reimbursement; $1,287 for internet and telephone reimbursement to maintain a home office; $9,062 for gross up payments for vehicle taxes. The aggregate incremental cost of the perquisites set forth in the table above is computed based on the actual expenses incurred by the company.

(7)

Amount includes $36,351 paid for health and welfare benefits for Ms. Friedmann, including a manager’s insurance policy, disability, and an education fund; $18,150 provided by the Company as a vehicle and gasoline allowance; $3,437 for cell phone reimbursement; $1,044 for internet and telephone reimbursement to maintain a home office; $15,045 for gross up payments for vehicle taxes. The aggregate incremental cost of the perquisites set forth in the table above is computed based on the actual expenses incurred by the company.

Employment Agreements and Potential Payments Upon Termination or Change-in-Control

We have entered into employment agreements with each of our named executive officers, the general terms of which are described in greater detail below. The amount of compensation payable to each named executive officer at, following, or in connection with their termination or a change-in-control is described below and identified on the table set forth below. Regardless of the manner in which a named executive officer’s employment terminates, the named executive officer is entitled to receive amounts accrued during their term of employment, including salary and unused vacation pay. Additionally, our Israeli executive officers are entitled to one month’s salary for each year of employment or a portion thereof. The figures on the table set forth below assume that the termination occurred on December 31, 2010.


Name	Acceleration of Vesting of Stock Options⁽¹⁾		Continuation of Benefits During Notice Period⁽²⁾ ($)		Severance Payment⁽³⁾ ($)		Total ($)
Daniel Zurr
Termination without cause⁽⁴⁾						325,000		325,000
Change-in-Control								0
Sagit Reich
Termination without cause⁽⁵⁾		—		74,172		—		74,172
Change-in-Control⁽⁶⁾		224,294				—		224,294
Smadar Samira Shakked
Termination without cause⁽⁷⁾				70,337				70,337
Change-in-Control								0

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Name	Acceleration of Vesting of Stock Options⁽¹⁾	Continuation of Benefits During Notice Period⁽²⁾ ($)		Severance Payment⁽³⁾ ($)	Total ($)
Shai Erlich
Termination without cause⁽⁸⁾			105,000			105,000
Change-in-Control						0
Elena Feinstein, M.D., Ph.D.
Termination without cause⁽⁹⁾			90,286			90,286
Change-in-Control						0
Rami Skaliter
Termination without cause⁽¹⁰⁾			99,020			99,020
Change-in-Control						0
Juliana Friedmann
Termination without cause⁽¹¹⁾			60,000			60,000
Change-in-Control						0

In addition to the payments set forth in the table above, employees of the company’s subsidiary are generally entitled to certain severance payments under the Israeli Severance Pay Law, which requires the company’s subsidiary to deposit in a severance payment fund an amount equal to one month of salary for each year of employment or a portion thereof for each employee, based on the employee’s most recent salary. Upon termination, the employees are entitled to severance in an amount equal to one month’s salary for each year of employment or a portion thereof, which is payable by the company’s subsidiary from the severance payment fund. This arrangement does not discriminate in scope, terms or operation in favor of executive officers of the company’s subsidiary and is available generally to salaried employees of the company’s subsidiary.

(1)

The amount listed in this column represents the Black-Scholes conversion value of the acceleration of vesting of stock options based on the price of our common stock on the grant date, which was $4.55.

(2)

Represents the present value of the continuation of our current employee benefits, including medical, dental, disability and life insurance.

(3)

The amounts listed in this column do not include the payment of accrued salary and vacation that would be due upon termination of employment.

(4)

Under Dr. Zurr’s employment agreement with the company and its subsidiary, Dr. Zurr is entitled to a severance payment equal to 12 months salary for termination without cause or for resignation for good reason, as set out in the employment agreement with Dr. Zurr.

(5)

Under Ms. Reich’s employment agreement with QBI, upon termination without cause, Ms. Reich is entitled to continuation of benefits during a 90-day notice period.

(6)

Under Ms. Reich’s employment agreement with QBI, Ms. Reich is entitled to accelerated vesting of 40% of the stock options held by Ms. Reich upon a “Qualified IPO” as defined in the company’s articles of incorporation, as amended from time to time. Upon a merger or acquisition of the company that results in a change in control, Ms. Reich is entitled to accelerated vesting of 100% vesting of stock options held by Ms. Reich.

(7)

Under Ms. Shakked’s employment agreement with QBI, Ms. Shakked is entitled to a notice period of 120 days prior to termination without cause with continuation of salary and benefits during that period.

(8)

Under Dr. Erlich’s employment agreement with QBI, Dr. Erlich is entitled to severance in the amount equal to four months salary for termination upon a termination without cause.

(9)

Under Dr. Feinstein’s employment agreement with QBI, Dr. Feinstein is entitled to a notice period of 120 days prior to termination without cause, with continuation of salary and benefits during that period.

(10)

Under Dr. Skaliter’s employment agreement with QBI, Dr. Skaliter is entitled to a notice period of 120 days prior to termination without cause, with continuation of salary and benefits during that period.

(11)

Under Ms. Friedmann’s employment agreement with QBI, Ms. Friedmann is entitled to a notice period of 120 days prior to termination without cause, with continuation of salary and benefits during that period.

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Daniel Zurr, Ph.D.

In January 2008, we entered into an employment agreement with Daniel Zurr, our President and Chief Executive Officer. The agreement provides that Dr. Zurr will receive an aggregate annual base salary of $325,000. In addition, Dr. Zurr is eligible to participate in the Company’s standard employee benefit plans, as in effect from time to time, which include group insurance plans (such as health, life and disability) and a retirement savings plan. Dr. Zurr is also entitled to the use of a company automobile and reimbursement for expenses associated with its use, including maintenance and all taxes. Dr. Zurr’s employment may be terminated under the agreement, with or without cause, at any time. Upon a termination without cause or Dr. Zurr’s resignation for good reason, including a material reduction in his compensation (except if the compensation of similarly situated officers is similarly reduced) or if the company materially breaches its obligations under any agreement with Dr. Zurr and the company does not remedy such reduction or breach during a period following Dr. Zurr’s notice to the Chairman of the Board, Dr. Zurr would be entitled to a lump sum payment equal to twelve months of his then current base salary as severance; provided, however, that if Dr. Zurr remains a member of the board following the termination of his employment, or serves as a consultant to the company following the termination of his employment, then this severance payment shall be offset by any compensation paid to Dr. Zurr by the company in connection with such role(s). Assuming that Dr. Zurr’s employment was terminated other than for cause, or Dr. Zurr resigned for good reason, at December 31, 2010, he would have been entitled to a lump sum payment of $325,000.

Sagit Reich

In August 2010, QBI entered into an employment agreement with Sagit Reich, our Chief Financial Officer. Under the terms of the agreement, Ms. Reich is entitled to an annual salary of approximately $158,000. Ms. Reich was also awarded options to purchase an aggregate of 120,000 shares of our Common Stock under our 2007 Equity Incentive plan. 40% of the options granted to Ms. Reich shall vest on the company’s “Qualified IPO,” as such term is defined in the company’s amended and restated articles of incorporation, as amended from time to time, and 100% of the options granted to Ms. Reich shall vest on a change-in-control of the company. In addition, upon a successful Qualified IPO, Ms. Reich is entitled to a bonus, at the discretion of the CEO of the Company. Any such bonus shall be paid within 60 days of the Qualified IPO, provided Ms. Reich’s employment with the QBI has not terminated. QBI is obligated to pay a certain percentage of Ms. Reich’s salary to a manager’s insurance policy which would cover payments made towards severance, pension, disability and an education fund. Ms. Reich is also entitled to the use of a company automobile and reimbursement for expenses associated with its use and maintenance, including all taxes, and reimbursement for a company cell phone. Ms. Reich’s employment is terminable at any time for cause and otherwise terminable by either party upon 90 days advance written notice. Assuming Ms. Reich’s employment was terminated other than for cause, at December 31, 2010, she would have been entitled to $74,172.

Smadar Samira Shakked

In September 1997, QBI entered into an employment agreement with Smadar Samira Shakked, our Senior Vice President of Business Development, Finance. Under the terms of the agreement, as last amended July 2008, Ms. Shakked is entitled to an annual salary of approximately $151,000. QBI is obligated to pay a certain percentage of Ms. Shakked’s base salary to apply towards a manager’s insurance policy which would cover payments made towards severance, pension, disability and an education fund. QBI’s aggregate obligations total approximately 23% of Ms. Shakked’s base salary. Ms. Shakked is also entitled to the use of a company automobile and reimbursement for expenses associated with its use and maintenance, including all taxes. Ms. Shakked’s employment is terminable without notice at any time for cause and otherwise terminable by either party upon 120 days advance written notice. Assuming Ms. Shakked’s employment was terminated, other than for cause, at December 31, 2010, she would have been entitled to $70,337. On January 31, 2011, the company and Ms. Shakked mutually agreed on the termination of her employment with QBI.

Shai Erlich, Ph.D.

In March 2003, we entered into an employment agreement with Shai Erlich, Ph.D., our Chief Medical Officer. Under the agreement, as amended, Dr. Erlich is entitled to an annual salary of $315,000 and benefits made generally available to all employees, including medical, dental, life and accidental death and disability

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insurance, and participation in our 401(k) plan. Additionally, Dr. Erlich was granted an option to purchase 10,000 shares of our common stock under our 1997 Stock Plan to replace previous grants that had been made under our plan for Israeli employees. The agreement also provides Dr. Erlich with limited reimbursement of relocation expenses. Either party may terminate the agreement upon 60 days advance written notice for any reason, provided however, we may terminate the agreement for cause at any time. In the event we have cause to terminate Dr. Erlich’s employment, subject to certain limitations, such termination would be effective upon notice to Dr. Erlich. Upon a termination without cause, Dr. Erlich would be entitled to severance equal to four months of his base salary. Assuming Dr. Erlich’s employment was terminated, other than for cause, at December 31, 2010, he would have been entitled to $105,000.

Elena Feinstein, M.D., Ph.D.

In June 2007, QBI entered into an employment agreement with Elena Feinstein, M.D., Ph.D., our Chief Scientific Officer. The agreement, as amended, provides that Dr. Feinstein will receive an annual salary of $200,000. Pursuant to the agreement, QBI is obligated to establish and pay a certain percentage of Dr. Feinstein’s salary to a manager’s insurance policy which would cover payments made towards severance, pension, disability, and an education fund. QBI’s aggregate obligations total approximately 23% of Dr. Feinstein’s base salary. Dr. Feinstein is entitled to the use of a company automobile and reimbursement for expenses associated with its use and maintenance, including all taxes, and reimbursement for a company cell phone. Under the agreement, upon a termination without cause, Dr. Feinstein would be entitled to notice of 120 days, with continuation of salary and benefits during that period. Assuming Dr. Feinstein’s employment was terminated, other than for cause, at December 31, 2010, she would have been entitled to $90,286.

Rami Skaliter, Ph.D.

In May 2007, QBI entered into an employment agreement with Rami Skaliter, Ph.D., our Chief Operating Officer. Under the terms of the agreement, as amended, Dr. Skaliter is entitled to an annual salary of approximately $220,000. Additionally, pursuant to the agreement, QBI is obligated to establish and pay a certain percentage of Dr. Skaliter’s salary to a manager’s insurance policy which would cover payments made towards severance, pension, disability, and an education fund. QBI’s aggregate obligations total approximately 23% of Dr. Skaliter’s base salary. Dr. Skaliter is entitled to the use of a company automobile and reimbursement for expenses associated with its use and maintenance, including all taxes, and reimbursement for a company cell phone. Upon a termination without cause, Dr. Skaliter would be entitled to notice of 120 days, with continuation of salary and benefits during that period. Assuming Dr. Skaliter’s employment was terminated, other than for cause, at December 31, 2010, he would have been entitled to $99,020.

Juliana Friedmann, M.Sc.

In February 1998, QBI entered into an employment agreement with Juliana Friedmann, our Senior Vice President of Strategy and Planning. Under the agreement, as last amended July 2008, Ms. Friedmann is entitled to an annual salary of approximately $126,300. Additionally, QBI is obligated to pay a certain percentage of Ms. Friedmann’s base salary to apply towards a manager’s insurance policy which would cover payments made towards severance, pension, disability and an education fund. QBI’s aggregate obligations total approximately 23% of Ms. Friedmann’s base salary. Ms. Friedmann is also entitled to the use of a company automobile and reimbursement for expenses associated with its use and maintenance, including all taxes, and reimbursement for a company cell phone. Ms. Friedmann’s employment is terminable without notice at any time for cause and otherwise terminable by either party upon 120 days advance written notice. Assuming Ms. Friedmann’s employment was terminated, other than for cause, at December 31, 2010, she would have been entitled to $60,000.

Grants of Plan-Based Awards

All stock options granted to our named executive officers are incentive stock options, to the extent permissible under the Internal Revenue Code of 1986, as amended. The exercise price per share of each stock option granted to our named executive officers prior to December 31, 2010 was not less than the fair market value of our common stock as determined by our board of directors on the date of the grant. Stock options are granted under our 2007 Equity Incentive Plan, 1997 Stock Plan or our 2003 Israeli Stock Option Plan.

On September 1, 2010, our board of directors approved option grants to certain of our employees and executive officers, including certain named executive officers. Ms. Shakked was granted an option to purchase

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35,000 shares of our common stock; Ms. Reich was granted an option to purchase 120,000 shares of our common stock. The exercise price of these options is $4.55 per share, which is equal to the fair market value per share of our common stock on the grant date for such options, as determined by our board of directors. Ms. Shakked’s options vest in equal monthly installments over a period of two years beginning on September 1, 2009, and 25% of Ms. Reich’s options vest on August 1, 2011 and 1/48^th of Ms. Sagit Reich’s options vest each month thereafter. Under Ms. Reich’s employment agreement with QBI, Ms. Reich is entitled to accelerated vesting of 40% of the stock options held by Ms. Reich upon a “Qualified IPO” as defined in the company’s articles of incorporation, as amended from time to time. Upon a merger or acquisition of the company that results in a change in control, Ms. Reich is entitled to accelerated vesting of 100% vesting of stock options held by Ms. Reich. No other plan-based awards were granted to the Company’s executive officers in 2010.

Grants of Plan-Based Awards

Name
(a)

Grant
Date
(b)

Estimated Future Payouts Under
Non-Equity Incentive Plan Awards

Estimated Future Payouts Under
Equity Incentive Plan Awards

All Other
Stock
Awards:
Number
of Shares
of Stock
or Units
(#)
(i)

All Other
Option
Awards:
Number
of
Securities
Underlying
Options
(#)
(j)

Exercise
or Base Price of
Option
Awards
($/Sh)
(k)

Grant
Date Fair
Value of
Stock and
Option
Awards
(l)

Threshold
($)
(c)

Target
($)
(d)

Maximum
($)
(e)

Threshold
($)
(f)

Target
($)
(g)

Maximum
($)
(h)

Smadar Samira Shakked
Senior Vice President of Business Development, Finance

9/1/2010

35,000

4.55

2.41

Sagit Reich
Chief Financial Officer

9/1/2010

120,000

4.55

2.45

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Outstanding Equity Awards At December 31, 2010

The following table sets forth certain information regarding equity awards granted to our named executive officers outstanding as of December 31, 2010. The options generally have four-year vesting terms and expire 10 years after the date of grant.


	Option Awards
Name (a)	Number of Securities Underlying Unexercised Options (#) Exercisable (b)			Number of Securities Underlying Unexercised Options (#) Unexercisable (c)			Equity Incentive Plan Awards: Number of Securities Underlying Unexercised Unearned Options (#) (d)		Option Exercise Price ($) (e)		Option Expiration Date (f)
Daniel Zurr		47,259	⁽¹⁾		1,706	⁽¹⁾		—	$	1.10		3/30/19
Sagit Reich		—			120,000	⁽⁷⁾		—		4.55		09/01/20
Rami Skaliter		27,586	⁽²⁾		—			—		5.80		12/04/13
		45,257	⁽¹⁾		3,018	⁽¹⁾		—		1.10		03/19/17
		31,250			28,750	⁽³⁾		—		1.10		12/29/18
		20,312	⁽⁴⁾		44,688	⁽⁴⁾		—		1.10		09/16/19
Smadar Samira Shakked		6,896	⁽²⁾		—			—		5.80		12/04/13
		32,326	⁽¹⁾		2,156	⁽¹⁾		—		1.10		03/19/17
		15,625	⁽³⁾		14,375	⁽³⁾		—		1.10		12/29/18
		6,562	⁽⁵⁾		8,438	⁽⁵⁾				1.10		03/30/19
		7,812	⁽⁴⁾		17,188	⁽⁴⁾				1.10		09/16/19
		21,875			13,125	⁽⁸⁾				4.55		09/01/20
Shai Erlich		2,586	⁽²⁾		—			—		5.80		05/16/13
		4,310	⁽²⁾		—			—		17.40		05/16/13
		12,068	⁽²⁾		—			—		5.80		12/29/15
		63,038	⁽¹⁾		4,203			—		1.10		03/19/17
		36,458	⁽³⁾		33,542					1.10		12/29/18
		14,062	⁽⁴⁾		30,938					1.10		09/16/19
Juliana Friedmann		38,792	⁽¹⁾		2,587			—		1.10		03/19/17
		15,625	⁽³⁾		14,375			—		1.10		12/29/18
		6,562	⁽⁵⁾		8,438					1.10		03/30/19
		18,750	⁽⁴⁾		41,250					1.10		09/16/19
Elena Feinstein, M.D., Ph.D.		6,896	⁽²⁾		—			—		5.80		12/04/13
		17,241	⁽⁶⁾		—			—		5.80		06/15/16
		42,025	⁽¹⁾		2,802					1.10		03/19/17
		31,250	⁽³⁾		28,750					1.10		12/29/18
		17,187	⁽⁴⁾		37,813					1.10		09/16/19

(1)

This option vests monthly over a 4-year period from March 19, 2007.

(2)

This option is fully vested as of December 31, 2009.

(3)

This option vests monthly over a 4-year period from November 12, 2008.

(4)

This option vests monthly over a 4-year period from September 16, 2009.

(5)

This option vests monthly over a 4-year period from March 30, 2009.

(6)

This option vests monthly over a 4-year period from June 15, 2006.

(7)

25% of the shares subject to this option vest on August 1, 2011; thereafter, this option vests monthly over a 3-year period from August 1, 2011.

(8)

This option vests monthly over a 2-year period from September 1, 2009.

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Option Exercises and Stock Vested

None of our named executive officers exercised stock options or had shares of restricted stock vest in 2010.

Pension Benefits

None of our named executive officers participate in or have account balances in qualified or non-qualified defined benefit plans sponsored by us. Our board of directors may elect to adopt qualified or non-qualified benefit plans in the future if it determines that doing so is in the best interest of the company and our shareholders, but we do not currently maintain such plans.

Nonqualified Deferred Compensation

None of our named executive officers participate in or have account balances in nonqualified defined contribution plans or other nonqualified deferred compensation plans maintained by us. Our board of directors may elect to provide our officers and other employees with non-qualified defined contribution or other nonqualified deferred compensation benefits in the future if it determines that doing so is in the best interest of the company and our shareholders, but we do not currently maintain such plans.

Compensation of Non-Employee Directors

Director Compensation for Fiscal Year 2010


Name	Fees Earned or Paid in Cash ($)		Stock Awards ($)	Option Awards ($)			Non-Equity Incentive Plan Compensation ($)	Change in Pension Value and Nonqualified Deferred Compensation Earnings ($)	Total ($)
Philip B. Simon, Chairman	$	—		$	17,742	⁽¹⁾			$	17,742
Yoshitaka Kitao	$	—							$	—
Robert Takeuchi	$	—							$	—
Philip M. Hahn	$	30,083		$	7,001	⁽²⁾			$	37,084
Toshihiro Toyoshima	$	—							$	—
Trent Gunter	$	29,250		$	1,172	⁽³⁾			$	30,422
Peter Thompson	$	25,250		$	1,172	⁽⁴⁾			$	26,422
Kazyuki Matsui	$	0		$	1,172	⁽⁵⁾			$	1,172

Fees paid to non-employee directors as disclosed in the table above were pro rated amounts paid to Messrs. Hahn, Gunter and Thompson for their services as members of the Company’s board of directors, based on an annual retainer of $20,000, plus amounts equal to $1,250 and $500 for every meeting of the Company’s board of directors attended in person or by conference telephone, respectively.

(1)

Grant date fair market value of stock option grant, computed in accordance with FASB ASC Topic 718, is equal to $0.66 per share; the exercise price is equal to $1.10 per share. The aggregate number of shares of common stock underlying option grants outstanding at the end of 2010 is equal to 130,000.

(2)

(3)

(4)

Grant date fair market value of stock option grant, computed in accordance with FASB ASC Topic 718, is equal to $0.66 per share; the exercise price is equal to $1.10 per share. The aggregate number of stock option grants outstanding at the end of 2010 is equal to 0. Mr. Thompson no longer serves on the company’s board of directors.

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(5)

Grant date fair market value of stock option grant, computed in accordance with FASB ASC Topic 718, is equal to $0.66 per share; the exercise price is equal to $1.10 per share. The aggregate number of stock option grants outstanding at the end of 2010 is equal to 0. Mr. Matsui no longer serves on the company’s board of directors.

Prior to the completion of this offering, our non-employee directors, other than those set forth in the table above who received fees earned in cash, were reimbursed for the actual costs of company-related travel only. No other compensation was paid to our outside directors in connection with their services.

2007 Equity Incentive Plan

Our board of directors adopted the 2007 Equity Incentive Plan, or 2007 Plan, in March 2007 and our shareholders approved the 2007 Plan in May 2007. The 2007 Plan will terminate on March 1, 2017, unless sooner terminated by our board of directors.

Stock Awards.

The 2007 Plan provides for the grant of incentive stock options, nonstatutory stock options, restricted stock awards, restricted stock unit awards, stock appreciation rights, performance stock awards, performance cash awards, and other stock-based awards, collectively, the “stock awards”.

Eligibility.

Incentive stock options may be granted only to our employees (including employees of our parent or subsidiary corporations). Our employees, directors, and consultants (and those of our affiliates) are eligible to receive all other types of stock awards under the 2007 Plan. Pursuant to Exhibit B to the 2007 Plan, referred to as the “Israeli sub-plan”, stock awards may be granted to participants who are subject to taxation in the State of Israel in a manner that qualifies the awards for favorable tax treatment under Section 102 of the 1961 Israeli Income Tax Ordinance (New Version). The Israeli sub-plan modifies the terms of stock awards granted to Israeli participants only to the extent necessary to comply with the requirements set by Israeli law.

The number of shares of common stock reserved for issuance under the 2007 Plan is 3,349,060 (of which 652,398 were available as of December 31, 2010), with the number of shares to be automatically increased on January 1st of each year, from 2008 until (and including) 2017, by four percent (4%) of the total number of shares of common stock outstanding on December 31st of the preceding calendar year. Notwithstanding the foregoing, our board of directors may act prior to the first day of any calendar year, to provide that there shall be no increase in the share reserve for such calendar year or that the increase in the share reserve for such calendar year shall be a lesser number of shares of common stock than would otherwise automatically occur.

If stock awards granted under the 2007 Plan expire or otherwise terminate without being exercised in full or are settled in cash, the shares of common stock not acquired pursuant to those awards become available for subsequent issuance under the 2007 Plan. If any shares of common stock issued pursuant to a stock award are forfeited because of a failure to vest in those shares, the forfeited shares will become available for subsequent issuance under the 2007 Plan. In addition, shares withheld in satisfaction of applicable withholding taxes or reacquired as consideration for the exercise of an option will become available for subsequent issuance under the 2007 Plan.

Award Limits.

No employee may be granted stock awards whose value is determined by reference to an increase over an exercise or strike price of at least one hundred percent (100%) of the fair market value of the common stock on the date of grant (such as options and stock appreciation rights) covering more than 689,655 shares of common stock during any calendar year. In addition, no person may be granted performance stock awards covering more than 25,862 shares of common stock during any calendar year. Finally, no person may be granted performance cash awards with a value exceeding $1,000,000 during any calendar year.

Administration.

Subject to the provisions of the 2007 Plan, our board of directors has the authority to determine what type of stock award will be granted, the provisions of each stock award granted, the number of shares subject

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to each stock award, and the time or times a participant is permitted to receive stock pursuant to a stock award. Our board of directors has the power to accelerate the vesting and exercisability of a stock award. Our board of directors also has the authority to reprice any outstanding options and to cancel outstanding options and grant new stock awards in substitution therefore. As administrator of the 2007 Plan, our board of directors has the authority to construe and interpret its provisions. Our board of directors has the power to suspend or terminate the 2007 Plan at any time, to amend the 2007 Plan in any respect deemed necessary or advisable, to submit any amendment to the 2007 Plan for shareholder approval, to approve forms of award agreements for use under the 2007 Plan, to exercise such powers and to perform such acts that are not inconsistent with the provisions of the 2007 Plan, and to adopt such procedures and sub-plans as are necessary or appropriate to permit participation in the 2007 Plan by employees, directors or consultants who are foreign nationals or employed outside the United States.

Our board of directors has the authority to delegate some or all of the administration of the 2007 Plan to a committee or committees composed of one or more members of our board. In the discretion of our board of directors, a committee may consist solely of two or more “non-employee directors” within the meaning of Rule 16b-3 of the Exchange Act, or solely of two or more “outside directors” within the meaning of Section 162(m) of the Code. The 2007 Plan also permits delegation of limited authority to one or more officers with respect to grants to employees other than officers of Quark. As used herein with respect to the administration of the 2007 Plan, “committee” refers to any committee appointed by our board, any subcommittee thereof, as well as our board of directors acting in its authority to administer the 2007 Plan.

Stock Options.

Options may be granted under the 2007 Plan pursuant to stock option agreements in the form adopted from time to time by the committee. The exercise price of options generally may not be less than 100% of the fair market value of the stock subject to the option on the date of grant. The exercise price may, at the discretion of the committee, be paid in (a) cash or check, (b) pursuant to a broker-assisted cashless exercise, (c) by delivery of other shares of common stock, (d) by a “net exercise” arrangement, or (e) in any other form of legal consideration acceptable to the committee. Options generally become exercisable in cumulative increments, or “vest,” as based on the optionee’s continued service with Quark or an affiliate. Shares covered by different options granted under the 2007 Plan may be subject to different vesting terms. The maximum term of options granted under the 2007 Plan is 10 years, subject to earlier expiration in the event of a termination of service. Options under the 2007 Plan generally expire three (3) months after termination of a participant’s service, with such period extended in the case of death or disability to twelve (12) months and eighteen (18) months, respectively. Notwithstanding the foregoing, the post-termination exercise period will be extended in the event that exercise of the option following termination of service is prohibited by applicable securities laws. In no event, however, may an option be exercised beyond the expiration of its term. Except as otherwise provided in the applicable stock option agreement, options granted under the 2007 Plan are not transferable other than by will or the laws of descent and distribution.

Special Rules for Incentive Stock Options.

No incentive stock option may be granted under the 2007 Plan to any person who, at the time of the grant, owns (or is deemed to own) stock possessing more than 10% of the total combined voting power of Quark or its affiliates, unless the exercise price of such option is at least 110% of the fair market value of the common stock subject to the option on the date of grant and the term of the option does not exceed five years from the date of grant. The aggregate fair market value, determined on the date of grant, of the shares of common stock with respect to which incentive stock options are exercisable for the first time by a participant during any calendar year (under the 2007 Plan and any other equity plans of Quark and its affiliates) may not exceed $100,000 (any excess of such amount is treated as nonstatutory stock options). No more than 1,950,019 shares of common stock may be issued pursuant to the exercise of incentive stock options.

Restricted Stock Awards.

Restricted stock awards may be granted under the 2007 Plan pursuant to the form of restricted stock award agreement adopted from time to time by our committee. Restricted stock awards may be granted in consideration for services rendered to Quark or an affiliate or for any other form of legal consideration

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acceptable to the committee. Restricted stock awards may be subject to vesting in accordance with a schedule to be determined by the committee. Upon termination of a participant’s service, any or all of the unvested shares of common stock subject to the restricted stock award may be forfeited by the participant and reacquired by Quark, as provided under the terms of the applicable award agreement. Rights to acquire shares under a restricted stock award agreement generally are not transferable, except as expressly permitted by the committee.

Restricted Stock Unit Awards.

Restricted stock unit awards may be granted under the 2007 Plan pursuant to the form of restricted stock unit award agreement adopted from time to time by the committee. At the time of grant, the committee will determine the consideration, if any, to be paid by the participant upon delivery of each share of common stock subject to the restricted stock unit award. The consideration to be paid (if any) by the participant for each share of common stock subject to a restricted stock unit award may be paid in services rendered to Quark or an affiliate or any other form of legal consideration as determined by the committee. Restricted stock award units may be subject to vesting pursuant to a schedule determined by the committee. Vested units may be settled by the delivery of shares of common stock, their cash equivalent, any combination thereof or in any other form of consideration, as determined by the committee. The committee may also impose restrictions or conditions that delay the delivery of the shares of common stock (or their cash equivalent) subject to a restricted stock unit award to a time after vesting. Upon the termination of a participant’s service, the unvested portion of the restricted stock unit award will be forfeited by the participant and reacquired by Quark unless otherwise provided in the restricted stock unit award agreement. Dividend equivalents may be credited in respect of shares of common stock covered by a restricted stock unit award, as determined by the committee and contained in the award agreement. Such dividend equivalents may be converted into additional shares of common stock covered by the restricted stock unit award in such manner as determined by the committee. Any additional shares covered by the restricted stock unit award credited by reason of such dividend equivalents will be subject to all the terms and conditions of the underlying restricted stock unit award agreement to which they relate.

Stock Appreciation Rights.

Stock appreciation rights may be granted under the 2007 Plan pursuant to the form of stock appreciation rights agreement adopted from time to time by the committee. Stock appreciation rights may be granted as stand-alone stock awards or in tandem with other stock awards. Each stock appreciation right will be denominated in shares of common stock equivalents. The strike price of each stock appreciation right will generally not be less than one hundred percent (100%) of the fair market value of the common stock equivalents subject to the stock appreciation right on the date of grant. The appreciation distribution payable on the exercise of a stock appreciation right will be not greater than an amount equal to the excess of (a) the aggregate fair market value (on the date of the exercise of the stock appreciation right) of a number of shares of common stock equal to the number of common stock equivalents in which the participant is vested under such stock appreciation right, and with respect to which the participant is exercising the stock appreciation right on such date, over (b) the strike price that will be determined by our board of directors at the time of grant of the stock appreciation right. Stock appreciation rights will be subject to vesting on such schedules as determined by the committee. The appreciation distribution may be paid in common stock, in cash, in any combination of the two or in any other form of consideration, as determined by the committee. The maximum term of stock appreciation rights granted under the 2007 Plan is 10 years, subject to earlier expiration in the event of a termination of service. Stock appreciation rights granted under the 2007 Plan generally expire three (3) months after termination of a participant’s service.

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Performance Stock Awards.

A performance stock award is a stock award that may be granted, may vest, or may be exercised based upon the attainment during a performance period of certain performance goals. The performance goals may be set in respect of any one or more of the following criteria: (i) earnings per share; (ii) earnings before interest, taxes and depreciation; (iii) earnings before interest, taxes, depreciation and amortization; (iv) total shareholder return; (v) return on equity; (vi) return on assets, investment, or capital employed; (vii) operating margin; (viii) gross margin; (ix) operating income; (x) net income (before or after taxes); (xi) net operating income; (xii) net operating income after tax; (xiii) pre-tax profit; (xiv) operating cash flow; (xv) sales or revenue targets; (xvi) increases in revenue or product revenue; (xvii) expenses and cost reduction goals; (xviii) improvement in or attainment of working capital levels; (xix) economic value added (or an equivalent metric); (xx) market share; (xxi) cash flow; (xxii) cash flow per share; (xxiii) share price performance; (xxiv) debt reduction; (xxv) implementation or completion of projects or processes; (xxvi) customer satisfaction; (xxvii) shareholders’ equity; and (xxviii) to the extent that an Award is not intended to comply with Section 162(m) of the Code, other measures of performance selected by the committee. Performance goals may be based on a company-wide basis, with respect to one or more business units, divisions, affiliates, or business segments, and in either absolute terms or relative to the performance of one or more comparable companies or the performance of one or more relevant indices. At the time of the grant of any performance award, the committee is authorized to determine whether, when calculating the attainment of performance goals (i) to exclude restructuring and/or other nonrecurring charges; (ii) to exclude exchange rate effects, as applicable, for non-U.S. dollar denominated net sales and operating earnings; (iii) to exclude the effects of changes to generally accepted accounting standards required by the Financial Accounting Standards Board; (iv) to exclude the effects of any statutory adjustments to corporate tax rates; and (v) to exclude the effects of any “extraordinary items” as determined under generally accepted accounting principles. In addition, the committee retains the discretion to reduce or eliminate the compensation or economic benefit due upon attainment of performance goals. The maximum number of shares that may be granted to any participant in a calendar year is 75,000. A performance stock award may, but need not, require the completion of a specified period of continuous service. The length of any performance period, the performance goals to be achieved during the performance period, and the measure of whether and to what degree such performance goals have been attained will be determined by the committee. In addition, to the extent permitted by applicable law and the applicable award agreement, the committee may determine that cash may be used in payment of performance stock awards.

Performance Cash Awards.

A performance cash award is a cash award that may be granted upon the attainment during a performance period of certain performance goals (as described above). A performance cash award may also require the completion of a specified period of continuous service. The length of any performance period, the performance goals to be achieved during the performance period, and the measure of whether and to what degree such performance goals have been attained will be conclusively determined by the committee in its sole discretion. The maximum amount that may be granted to any participant in a calendar year is $1,000,000. The committee may provide for or may permit a participant to elect for, the payment of any performance cash award to be deferred to a specified date or event. The committee may specify the form of payment of performance cash awards, which may be cash or other property. In addition, the committee may determine that common stock authorized under the 2007 Plan may be used in payment of performance cash awards.

Other Stock Awards.

The committee may grant other incentive awards based in whole or in part by reference to the value of Quark’s common stock. Subject to the provisions of the 2007 Plan, the committee has the authority to determine the persons to whom and the dates on which such other stock awards will be granted, the number of shares of common stock (or cash equivalents) to be subject to each award, and other terms and conditions of such awards. Such awards may be granted either alone or in addition to other stock awards granted under the 2007 Plan.

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Tax Withholding.

The committee may require a participant to satisfy any federal, state, local, or foreign tax withholding obligation relating to a stock award by (a) causing the participant to tender a cash payment; (b) withholding shares of common stock from the shares of common stock issued or otherwise issuable to the participant in connection with the award; (iii) withholding cash from an award settled in cash or other payments made to a participant; or (iv) by such other method as may be set forth in the award agreement.

Changes to Capital Structure.

In the event any change is made to our common stock without the receipt of consideration, whether through merger, consolidation, reorganization, recapitalization, stock dividend, dividend in property other than cash, stock split, liquidating dividend, combination of shares, exchange of shares, change in corporate structure, or otherwise, our board of directors will appropriately adjust: (a) the class(es) and maximum number of securities subject to the 2007 Plan, (b) the class(es) and maximum number of securities that may be issued pursuant to the exercise of incentive stock options, (c) the class(es) and maximum number of securities (or amount of cash consideration) that may be awarded to any person pursuant to performance stock awards and other stock-based awards intended to satisfy the requirements of Section 162(m) of the Code (such as options and stock appreciation rights), and (d) the class(es) and number of securities and price per share of stock subject to outstanding stock awards. Our board of directors will make such adjustments, and its determination will be final, binding and conclusive.

Corporate Transactions; Changes in Control.

In the event of certain significant corporate transactions, outstanding stock awards under the 2007 Plan may be assumed, continued, or substituted by any surviving corporation. If the surviving corporation does not assume, continue, or substitute such stock awards, then (a) with respect to any such stock awards that are held by individuals performing services for Quark or its affiliates at the effective time of the transaction, the vesting and exercisability provisions of such stock awards will be accelerated in full and such stock awards will be terminated if not exercised prior to the effective date of the corporate transaction, and (b) all other outstanding stock awards will be terminated if not exercised prior to the effective date of the corporate transaction. A stock award may be subject to additional acceleration of vesting and exercisability as may be provided in the stock award agreement for such stock award or as may be provided in any other written agreement between Quark or any affiliate and the participant. The acceleration of stock awards in connection with significant corporate transactions and changes in control may be viewed as an anti-takeover provision, which may have the effect of discouraging a proposal to acquire or otherwise obtain control of Quark.

Duration, Termination, and Amendment.

Our board of directors may suspend or terminate the 2007 Plan at any time. The 2007 Plan is scheduled to terminate immediately prior to the 10^th anniversary of the date it was adopted by our board of directors. No rights may be granted under the 2007 Plan while the 2007 Plan is suspended or after it is terminated. Our board of directors may amend or modify the 2007 Plan at any time, subject to any shareholder approval required by applicable law or regulation.

2010 Employee Stock Purchase Plan

In October 2010, our board of directors adopted our 2010 Employee Stock Purchase Plan (or ESPP) and our shareholders approved the ESPP in March 2011. The ESPP will become effective upon completion of this offering. The purpose of the ESPP is to assist us in providing incentives for our employees to exert maximum efforts toward our success.

Share Reserve. Following this offering, the ESPP authorizes the issuance of 500,000 shares of common stock pursuant to purchase rights to be granted to our employees or the employees of any of our parent or subsidiary companies designated by our board of directors to participate in the ESPP. The number of shares of common stock available for issuance will automatically increase on January 1st of each year commencing in 2012 and ending on (and including) January 2021 in an amount equal to 100,000 shares of common stock. Notwithstanding the foregoing, our board of directors may act prior to the first day of any calendar year, to provide that there shall be no increase in the share reserve for such calendar year or that the increase in the

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share reserve for such calendar year shall be a lesser number of shares of common stock than would otherwise occur pursuant to the preceding sentence. If any purchase right granted under the ESPP will for any reason terminate without having been exercised, the shares of common stock not purchased under such purchase right will again become available for issuance under the ESPP. The ESPP is intended to qualify as an “employee stock purchase plan” within the meaning of Section 423 of the Internal Revenue Code.

Administration. Our board of directors administers the ESPP and has the final power to construe and interpret both the ESPP and the purchase rights granted thereunder. Our board of directors has the power, subject to the provisions of the ESPP, to determine the provisions of each offering of rights to purchase our common stock, and whether employees of any of our parent or subsidiary companies will be eligible to participate in the ESPP. Our board of directors has the power to delegate administration of the ESPP to a committee or committees. As used herein with respect to the ESPP, “board of directors” refers to any committee or committees our board appoints as well as to our board itself. The ESPP will be implemented through a series of offerings of such duration as determined by our board of directors to eligible employees, provided that in no event may an offering exceed 27 months. Each offering will consist of one or more purchase periods as determined by our board of directors prior to the commencement of that offering. Our board of directors has the authority to alter the duration of subsequent offerings or change the number of purchase dates within each such offering. The provisions of separate offerings need not be identical. When an eligible employee elects to join an offering, he or she will be granted a purchase right to acquire shares of common stock on each purchase date within the offering. On the purchase date, all payroll deductions collected from the participant are automatically applied to the purchase of common stock, subject to certain limitations. Our board of directors has not yet established the terms of any offering.

Payroll Deductions. Generally, all regular employees, including executive officers, employed by us or by any of any of our parent or subsidiary companies designated by our board of directors may contribute, normally through payroll deductions, up to 15% of their eligible cash compensation (or such lesser amount set by our board of directors for a specific offering) for the purchase of common stock under the ESPP. Amounts deducted and accumulated for a participant are used to purchase shares of our common stock on the purchase dates established by our board of directors. All payroll deductions made for a participant are credited to his or her account under the ESPP and deposited with our general funds. A participant may make additional payments into such account only as specifically provided for in the offering and only if the participant has not exceeded certain limitations under the ESPP or under the terms of such offering. The ESPP permits common stock to be purchased at a price per share no less than the lower of (i) 85% of the fair market value of a share of our common stock on the offering date, or (ii) 85% of the fair market value of a share of our common stock on the applicable purchase date.

Purchase of Stock. An eligible employee must sign and return an agreement in order to participate in the ESPP. In connection with offerings made under the ESPP, our board of directors may specify a maximum number of shares of common stock a participant may purchase and the maximum aggregate number of shares of common stock that may be purchased by all participants in such offering. In addition, in connection with each offering that contains more than one purchase date, our board of directors may specify a maximum aggregate number of shares of common stock that may be purchased by all participants on any purchase date under the offering. If the aggregate number of shares to be purchased upon exercise of outstanding purchase rights in the offering would exceed the maximum aggregate number of shares of common stock available, our board of directors will make a pro rata allocation of available shares in a uniform and equitable manner. Unless the employee’s participation is discontinued, his or her right to purchase shares is exercised automatically at the next purchase date at the applicable price.

Withdrawal. During an offering, a participant may cease making contributions and withdraw from the offering by delivering a notice of withdrawal and terminating his or her payroll deductions in such form as we may require. Such withdrawal may occur at any time prior to the end of an offering except as otherwise provided by our board of directors. Upon such withdrawal, we will refund accumulated payroll deductions without interest to the employee, and such employee’s right to participate in that offering will terminate. However, an employee’s withdrawal from an offering does not generally affect such employee’s eligibility to participate in subsequent offerings under the ESPP.

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Reset Feature. Our board of directors has the authority to provide that if the fair market value of a share of our common stock on the first day of any purchase period within a particular offering is less than the fair market value on the start date of that offering, then the participants in that offering will automatically be transferred and enrolled in a new offering which will begin on the first day of that purchase period and the participant’s purchase rights in the original offering will terminate.

Limitations. Our board of directors may limit participation in the ESPP to those persons who are customarily employed more than 20 hours per week and five months per calendar year by us (or by any of our parent or subsidiary companies designated by our board of directors) on the first day of an offering. The Board may also provide that a person must have been employed for such continuous period preceding the first day of the offering as our board of directors may require, but in no event may the required period of continuous employment be greater than two (2) years. In addition, our board of directors may provide in any offering that certain of our employees who are “highly compensated” as defined in the Code are not eligible to participate in the ESPP. Our board of directors may also provide that each person who, during the course of an offering, first becomes an eligible employee shall, on a date or dates specified in the offering, receive a purchase right under that offering at a price equal to the market price of our common stock at that time, which purchase right will be deemed to be a part of that offering, and such purchase right shall generally have the same characteristics as any purchase rights originally granted under that offering. No employee is eligible to participate in the ESPP if, immediately after the grant of purchase rights, the employee would own, directly or indirectly, stock possessing 5% or more of the total combined voting power or value of all classes of our stock or of any of our parent or subsidiary companies (including any stock which such employee may purchase under all outstanding purchase rights and stock options). In addition, no employee may purchase more than $25,000 worth of our common stock (valued at the time each purchase right is granted) for each calendar year during which those purchase rights are outstanding.

Termination of Employment. Purchase rights granted pursuant to any offering under the ESPP terminate upon cessation of employment for any reason, and we will refund all accumulated payroll deductions to the terminated employee without interest.

Restrictions on Transfer. A participant may not transfer rights granted under the ESPP other than by will, the laws of descent and distribution, or by a beneficiary designation as provided in the ESPP. During a participant’s lifetime, purchase rights shall be exercisable only by such participant.

Changes to Capital Structure. In the event that there is any change to the outstanding common stock (whether by reason of merger, consolidation, reorganization, recapitalization, stock dividend, dividend in property other than cash, stock split, liquidating dividend, combination of shares, exchange of shares, change in corporate structure, or other transaction not involving the receipt of consideration by Quark), appropriate adjustments will be made to (a) the class(es) and maximum number of securities subject to the ESPP, (b) the class(es) and maximum number of securities by which the share reserve is to increase automatically each year, (c) the class(es) and number of securities subject to outstanding purchase rights, and (d) the class(es) and number of securities imposed by purchase limits under each ongoing offering.

Corporate Transactions. In the event of certain significant corporate transactions, any surviving or acquiring corporation may assume or substitute similar purchase rights for those outstanding under the ESPP. If the surviving or acquiring corporation does not assume such rights or substitute similar rights, then the participants’ accumulated payroll deductions will be used to purchase of shares of common stock within ten (10) business days prior to the corporate transaction under any ongoing offerings, and such purchase rights will terminate immediately thereafter.

Termination and Amendment. Our board of directors may amend, suspend or terminate the ESPP at any time. Any amendment of the ESPP must be approved by our shareholders to the extent shareholder approval is necessary for the ESPP to satisfy Sections 423 of the Code or other applicable laws and regulations. Purchase rights granted before amendment or termination of the ESPP generally may not be altered or impaired by any amendment or termination of the ESPP without consent of the employee to whom such purchase rights were granted. No purchase rights may be granted under the ESPP while the ESPP is suspended or after it is terminated.

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Compensation Committee Interlocks and Insider Participation

Our board of directors de-constituted our Compensation Committee on April 16, 2009, based on a determination that the board of directors did not need a Compensation Committee in place at the time. During the fiscal year ended December 31, 2010, Dr. Zurr, our Chief Executive Officer, participated in the deliberations of our Board of Directors with respect to executive officer compensation. Dr. Zurr makes recommendations regarding executive compensation, however, Dr. Zurr does not participate in discussions regarding his own compensation. None of our executive officers currently serves or in the prior three years has served as a member of the Board of Directors or compensation committee of any entity that has one or more executive officers serving on our board.

Limitation of Liability and Indemnification

Our amended and restated articles of incorporation, which will become effective upon the completion of this offering, limits the liability of our directors to the fullest extent permitted by California law. The California Corporations Code authorizes a court to award, or a corporation’s board of directors to grant, indemnity to directors and officers, subject to certain exceptions, by reason of the fact that the person is or was an agent of the corporation, if that person acted in good faith and in a manner the person reasonably believed to be in the best interests of the corporation.

Our amended and restated bylaws, which will become effective upon the completion of this offering, provide that we will indemnify our directors and executive officers, and may indemnify other officers, employees and other agents, to the fullest extent permitted by law. Our amended and restated bylaws also permit us to secure insurance on behalf of any officer, director, employee or other agent for any liability arising out of his or her actions in connection with their services to us, regardless of whether our amended and restated bylaws permit such indemnification. We have obtained such a directors’ and officers’ liability insurance policy.

We intend to enter into separate indemnification agreements with our directors and executive officers, in addition to the indemnification provided for in our amended and restated bylaws. These agreements, among other things, require us to indemnify our directors and executive officers for certain expenses, including attorneys’ fees, judgments, fines and settlement amounts incurred by a director or executive officer in any action or proceeding arising out of their services as one of our directors or executive officers, or any of our subsidiaries or any other company or enterprise to which the person provides services at our request.

At present, there is no pending litigation or proceeding involving any of our directors or executive officers as to which indemnification is required or permitted, and we are not aware of any threatened litigation or proceeding that may result in a claim for indemnification.

Insofar as indemnification for liabilities arising under the Securities Act may be permitted to directors, executive officers or persons controlling us, we have been informed that in the opinion of the SEC such indemnification is against public policy as expressed in the Securities Act and is therefore unenforceable.

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The following is a summary of transactions from January 1, 2007 to December 31, 2010 to which we have been a party in which the amount involved exceeded $120,000 and in which any of our executive officers, directors or beneficial holders of more than five percent of our capital stock had or will have a direct or indirect material interest, other than compensation arrangements which are described under the section of this prospectus entitled “Compensation Discussion and Analysis.”

We anticipate adopting a policy prior the completion this offering, but do not currently have a policy in place.

Sale of Securities

In March 2008, April 2008 and May 2010, we issued and sold to holders of more than 5% of our capital stock an aggregate of 7,400,000 shares of Series H preferred stock at a purchase price of $5.00 per share, for an aggregate consideration of approximately $37,000,000. Upon the completion of this offering, these shares will convert into an aggregate of 7,400,000 shares of common stock.

In May 2010, in connection with the issuance of shares of Series H preferred stock to investors, we issued and sold warrants to purchase an aggregate of 300,000 shares of Series H preferred stock, all of which warrants have been exercised as of December 31, 2010 at a purchase price of $5.00 per share, for an aggregate consideration of $1,500,000. Upon the completion of this offering, these shares will convert into an aggregate of 300,000 shares of common stock.

The participants in these preferred stock and preferred stock warrant issuances include the following holder of more than 5% of our capital stock. The following table presents the number of shares issued to this related party. For a description of current beneficial ownership, see “Principal Shareholders”.


Purchaser	Series H preferred stock
5% Shareholders
SBI Holdings, Inc.		8,831,510

Amended and Restated Investors’ Rights Agreement

We have entered into an investors’ rights agreement with the purchasers of our outstanding preferred stock and certain holders of common stock and warrants to purchase Series H Preferred stock, including entities with which certain of our directors are affiliated. As of December 31, 2010, the holders of 17,996,100 shares of our common stock, including the shares of common stock issued upon the automatic conversion of our preferred stock and shares of common stock issued upon the conversion of shares of preferred stock issued upon the exercise of warrants, are entitled to rights with respect to the registration of their shares under the Securities Act. For a description of these registration rights, see “Description of Capital Stock — Registration Rights.”

Employment Agreements

We have entered into employment agreements with our executive officers and directors. For more information regarding these agreements, see “Compensation Discussion and Analysis — Employment Agreements and Potential Payments Upon Termination.”

Stock Options Granted to Executive Officers and Directors

We have granted stock options to our executive officers and directors. For more information regarding these stock options, see “Management — Executive Compensation.”

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Indemnification Agreements with Executive Officers and Directors

Effective upon the closing of this offering, we will have entered into an indemnification agreement with each of our directors and executive officers. These indemnification agreements and our amended and restated articles of incorporation and amended and restated bylaws will indemnify each of our directors and officers to the fullest extent permitted by the California Corporations Code. See “Management — Limitation of Liability and Indemnification.”

Loan to Chief Executive Officer

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PRINCIPAL SHAREHOLDERS

The following table sets forth information regarding the beneficial ownership of our common stock as of February 28, 2011 and as adjusted to reflect the sale of the common stock in this offering for:

•

each person, or group of affiliated persons, known by us to beneficially own more than 5% of our common stock;

•

each of our named executive officers;

•

each of our directors; and

•

all of our executive officers and directors as a group.

The percentage ownership information shown in the table is based upon 21,384,630 shares of common stock outstanding as of February 28, 2011, assuming the conversion of all outstanding shares of our preferred stock as of February 28, 2011, and 27,009,630 shares of common stock outstanding after completion of the offering, assuming the sale of 37,500 units in this offering and no sales to our existing principal shareholders and assuming no purchase of any additional allotment of units.

Information with respect to beneficial ownership has been furnished by each director, officer or beneficial owner of more than 5% of our common stock. We have determined beneficial ownership in accordance with the rules of the SEC. These rules generally attribute beneficial ownership of securities to persons who possess sole or shared voting power or investment power with respect to those securities. In addition, the rules include shares of common stock issuable pursuant to the exercise of stock options or warrants that are either immediately exercisable or exercisable on or before April 29, 2011, which is 60 days after February 28, 2011. These shares are deemed to be outstanding and beneficially owned by the person holding those options or warrants for the purpose of computing the percentage ownership of that person, but they are not treated as outstanding for the purpose of computing the percentage ownership of any other person. Unless otherwise indicated, the persons or entities identified in this table have sole voting and investment power with respect to all shares shown as beneficially owned by them, subject to applicable community property laws.

Except as otherwise noted below, the address for each person or entity listed in the table is c/o Quark Pharmaceuticals, Inc., 6501 Dumbarton Circle, Fremont, California 94555.

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	Number of shares beneficially owned		Percentage of shares beneficially owned (%)
Name and Address of Beneficial Owner	Number of shares beneficially owned		Before offering		After offering
5% Shareholders
SBI Holdings, Inc. ⁽¹⁾ Izumi Garden Tower 1-6-1 Roppongi, Minato-ku Tokyo 106-6019		8,831,510		41.3		32.7
Lawrence Investments, LLC ⁽²⁾ Attn: Lawrence J. Ellison Oracle Corporation 500 Oracle Parkway Redwood Shores, CA 94605		5,492,332		25.7		20.3
Executive Officers and Directors
Daniel Zurr, Ph.D. ⁽³⁾		1,773,102		8.3		6.6
Rami Skaliter, Ph.D. ⁽⁴⁾		164,735		*
Juliana Friedmann ⁽⁵⁾		105,754		*
Smadar Shakked, CPA (Isr) ⁽⁶⁾		121,157		*
Shai Erlich, Ph.D. ⁽⁷⁾		146,308		*
Elena Feinstein, M.D., Ph.D. ⁽⁸⁾		126,984		*
Sagit Reich, CPA (Isr)		0		*
Yoshitaka Kitao ⁽⁹⁾		8,831,510		41.3		32.7
Toshihiro Toyoshima ⁽¹⁰⁾		988,662		4.6
Philip M. Hahn ⁽¹¹⁾		38,166		*
Philip B. Simon ⁽¹²⁾		5,619,915		26.1		20.7
Robert Takeuchi				*
All executive officers and directors as a group (13 persons)		17,913,293		80.7		64.4

Represents beneficial ownership of less than 1%.

(1)

Includes 149,625 shares held directly by SBI Broadband Capital Co., Ltd., 620,000 shares held directly by TS-MI No. 1 Investment Limited Partnership, 318,302 shares held directly by TS-US No. 1 Investment Limited Partnership, 340,000 shares held directly by TS-US No. 3 Investment Limited Partnership, 1,398,318 shares held directly by SBI Life Science Technology Investment LPS, 932,212 shares held directly by SBI Life Science Technology II Investment LPS, 869,470 shares held directly by SBI Selective Target Investment LPS, 265,500 by SBI Bio Life Science Investment LPS, 244,125 shares held directly by SBI Broadband Fund No. 1 Limited Partnership, 236,250 shares held directly by SBI BB Mobile Investment LPS, 210,000 shares held directly by IP Investment LPS, †157,500 shares held directly by SBI BB Media Investment Limited Partnership, 1,820,000 shares held directly by SBI Bond and Private Equity Fund III and 1,273,208 shares held directly by Japan Trustee Services Bank Ltd. re: RTB Trans-Science Global Biotechnology Fund (collectively, the “SBI Companies”). Mr. Yoshitaka Kitao is the Representative Director and CEO of SBI Holdings, Inc. (“SBI Holdings”) which controls the SBI Companies. Mr. Kitao disclaimer beneficial ownership of these shares, except to the extent of his pecuniary interest therein.

(2)

Mr. Philip B. Simon is the President of Lawrence Investments LLC (“Lawrence Investments”). Mr. Simon has voting authority over the shares held by Lawrence Investments, although Mr. Lawrence J. Ellison, by virtue of his control of Lawrence Investments, possess the ultimate authority over the voting and disposition of such shares. Mr. Simon disclaims beneficial ownership of the shares held by Lawrence Investments except to the extent of his pecuniary interest therein.

(3)

Includes 48,965 shares of common stock issuable upon the exercise of stock options exercisable within 60 days of February 28, 2011.

(4)

Includes 137,840 shares of common stock issuable upon the exercise of stock options exercisable within 60 days of February 28, 2011.

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(5)

Includes 90,754 shares of common stock issuable upon the exercise of stock options exercisable within 60 days of February 28, 2011.

(6)

Includes 104,606 shares of common stock issuable upon the exercise of stock options exercisable within 60 days of February 28, 2011.

(7)

Includes 146,308 shares of common stock issuable upon the exercise of stock options exercisable within 60 days of February 28, 2011.

(8)

Includes 126,984 shares of common stock issuable upon the exercise of stock options exercisable within 60 days of February 28, 2011.

(9)

Includes 8,831,510 shares of common stock beneficially owned directly by the SBI Companies. See footnote 1.

(10)

Includes 988,662 shares of common stock beneficially owned directly by Asuka DBJ Investment LPS. Mr. Toyoshima is the CEO of Asuka DBJ Partners Co Ltd., the general partner of Asuka DBJ Investment LPS. Mr. Toyoshima disclaims beneficial ownership of the shares held by Asuka DBJ Investment LPS except to the extent of his pecuniary interest therein.

(11)

Includes 38,166 shares of common stock issuable upon the exercise of stock options exercisable within 60 days of February 28, 2011.

(12)

Includes 124,583 shares of common stock issuable upon the exercise of stock options exercisable within 60 days of February 28, 2011. Includes 5,492,332 shares of common stock beneficially owned directly by Lawrence Investments. Mr. Simon is the President of Lawrence Investments. Mr. Simon disclaims beneficial ownership of the shares held by Lawrence Investments except to the extent of his pecuniary interest therein.

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DESCRIPTION OF CAPITAL STOCK

Upon completion of this offering and the filing of our amended and restated articles of incorporation, our authorized capital stock will consist of 100,000,000 shares of common stock, par value $0.001 per share, and no shares of preferred stock.

The following is a summary of the rights of our common stock and preferred stock. This summary is not complete. For more detailed information, please see our amended and restated articles of incorporation and amended and restated bylaws, which are filed as exhibits to the registration statement of which this prospectus is a part.

Units

Each unit consists of 100 shares of our common stock and 50 warrants. Each warrant shall be exercisable into one share of our common stock at an exercise price equal to NIS ($ ) and will be exercisable for two years from the date on which they are issued.

Common Stock

Outstanding Shares.

Based on 21,384,630 shares of common stock outstanding as of February 28, 2011, which assumes the conversion of all outstanding preferred stock into 17,996,100 shares of common stock upon the completion of this offering, the issuance of shares of common stock in this offering, and no exercise of outstanding options or warrants, there will be 27,009,630 shares of common stock outstanding upon completion of this offering assuming the sale of 37,500 units in this offering and no sales to our existing principal shareholders and assuming no purchase of any additional allotment of units. As of February 28, 2011, assuming the conversion of all outstanding preferred stock into common stock upon the completion of this offering, we had approximately 134 record holders of our common stock.

As of February 28, 2011, there were 2,610,274 shares of common stock subject to outstanding options, and no shares subject to outstanding warrants.

Voting Rights.

Each holder of common stock is entitled to one vote for each share of common stock held on all matters submitted to a vote of the shareholders, including the election of directors, except as set forth below. Our amended and restated articles of incorporation and amended and restated bylaws provide for cumulative voting rights for the election of directors, subject to applicable laws.

Dividends.

Subject to preferences that may be applicable to any then outstanding preferred stock, the holders of our outstanding shares of common stock are entitled to receive dividends, if any, as may be declared from time to time by our board of directors out of legally available funds.

Liquidation.

In the event of our liquidation, dissolution or winding up, holders of common stock will be entitled to share ratably in the net assets legally available for distribution to shareholders after the payment of all of our debts and other liabilities, subject to the satisfaction of any liquidation preference granted to the holders of any outstanding shares of preferred stock.

Rights and Preferences.

Holders of our common stock have no preemptive or subscription rights, and there are no redemption or sinking fund provisions applicable to our common stock. The rights, preferences and privileges of the holders of common stock are subject to, and may be adversely affected by, the rights of the holders of shares of any series of our preferred stock that we may designate and issue in the future, to the extent permissible under applicable law.

Fully Paid and Nonassessable.

All of our outstanding shares of common stock are, and the shares of common stock to be issued in this offering will be, fully paid and nonassessable.

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Preferred Stock

Upon the closing of this offering, all outstanding shares of preferred stock will convert into shares of common stock. See Notes 10 and 11 to our financial statements for a description of the currently outstanding preferred stock.

Warrants

Warrants Issued Under the Units

Exercise Price and Exercise Period

Each unit offered in this offering consists of 100 shares of our common stock and 50 warrants. Each warrant shall be exercisable into one share of our common stock at an exercise price (such amount being equal to approximately 125% of the offering price of one share of common stock and one-half of a warrant comprising a portion of a unit) equal to NIS per share (approximately $ per share), linked to the last known representative U.S. dollar exchange rate (hereinafter, the “base rate”) as determined by the Bank of Israel on , the date of the auction, and subject to adjustment as set forth below. The warrants will be exercisable for a period of two years commencing on the date on which they are issued, or until , 2013. If at the time of exercise of the warrants, the exercise rate, which shall be equal to the U.S. dollar representative rate on the date of exercise as determined by the Bank of Israel, increases or decreases relative to the base rate, the exercise price of the warrants will increase or decrease, as the case may be, by an amount that is equal to the increase or decrease of the exercise rate relative to the base rate, as converted to Shekels on such date. The warrants may not be exercised by means of a cashless exercise, except in the case of a voluntary winding up of the company, as set forth below. The ability to exercise the warrants is also subject to, at the time of exercise, the effectiveness of a registration statement covering the warrants and the shares underlying the warrants. In the event that an effective registration statement covering the warrants and the shares underlying the warrants is not available, a warrant holder will not be entitled, under the terms of the warrants, to exchange the warrants for cash or to any compensation due to the lack of availability of an effective registration statement covering the warrants and the shares underlying the warrants.

The exercise price of the warrants has been determined by our management based on management’s assessment of prevailing market conditions. A warrant that is not exercised by the end of the exercise period shall not afford the holder thereof any right and shall expire at the end of the exercise period.

Shares of our common stock issued upon the exercise of the warrants will have the same rights afforded to holders of our common stock, as in effect on the date of exercise of the warrant or as thereafter amended or modified.

Exercise Procedure

A warrant holder may:

•

exercise its warrants through TASE members, in the event that the holder is an unregistered warrant holder and holds the warrants through TASE members and the Nominee Company, which holds a deed of allotment for all warrants issued to unregistered warrant holders, or

•

exercise its warrants directly with the company, if the holder is registered with the company as a warrant holder.

The exercise of warrants shall be completed by submitting a notice of exercise, together with deeds of allotment for the warrants issued by the nominee warrant holder, if any, and the amount in cash equal to the aggregate exercise price for the shares underlying the warrants.

If the warrants are exercised directly with the company, the date of exercise shall be deemed to be the date on which a notice of exercise that meets all of the conditions specified therein is delivered to the company. In the event of delivery of the notice of exercise through a TASE member by an unregistered warrant holder, the date of exercise shall be the date on which the TASE Clearing House receives notice from the TASE member of the exercise of the warrant, in compliance with all the conditions set forth therein. A notice of exercise received by the TASE Clearing House after 12:00 p.m. Israel time shall be deemed to have been on the next trading day. The warrant holder may be required to sign additional documents required under

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the provisions of applicable law or our articles of incorporation or bylaws, as may be required by us or by the TASE member, in order to give effect to the issuance of the shares upon the exercise of the warrants held by such holder.

Once delivered, a notice of exercise may not be cancelled or amended by the warrant holder. Partial exercise of a warrant will not be permitted.

If the final date for exercise of a warrant falls on a date that is not a trading day, the final date for exercise shall be postponed to the next trading day immediately thereafter. On the final date of exercise, or if the final date of exercise is not a trading day, then on the first trading day thereafter, for exercise of warrants through TASE members, the TASE members must submit the notices of exercise to the TASE Clearing House by 9:00 a.m. Israel time on that day in order to effect exercise of the warrants on the same day. Warrants that are not exercised by the prescribed time periods and in the manner set forth above will expire.

The procedure for exercise of the warrants shall be subject to the rules of the TASE Clearing House as in effect on the date corresponding to any such exercise.

Transfer of Warrants

Subject to the rules, regulations and guidelines of TASE, the deeds of allotment of the warrants held by warrant holders through TASE members and a Nominee Company, may be transferred provided that corresponding deeds of transfer are submitted to the company. The deeds of transfer shall be in a format similar to a deed of transfer of shares. The company shall keep a register at its registered office, containing a list of the registered holders of its warrants. The provisions of the articles of incorporation or bylaws of the company regarding the transfer of fully-paid shares shall apply to transfer of the deeds of allotment of the warrants.

Any deed of allotment of warrants may be transferred into a number of deeds of allotment, with the total number of shares underlying the warrants contained therein remaining the same. Such transfer shall occur pursuant to a request to transfer the warrants signed by the registered owner of the deed of allotment or such person’s lawful representative, which shall be delivered to the company at its registered office together with the deed of allotment requested to be so transferred.

All of the expenses incurred in any such transfer, including mandatory payments, if any, shall be paid by the warrant holder wishing to effect the transfer or division.

Adjustment of Shares and Exercise Price

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If the company offers its shareholders securities of any kind by way of a rights issuance, between the date of issuance of the warrants and the end of the exercise period, the number of shares underlying the warrants and not yet exercised shall be adjusted on the effective date of the rights issuance in accordance with the bonus component of the rights issuance, as expressed in the ratio of the share price on TASE on the effective date to the base rate “ex rights.”

•

If the company distributes a cash dividend, with a record date that is prior to the end of the exercise period of the warrants, then, beginning on the first trading day on which the shares of the company will be traded after the effective date of such distribution, the exercise price of the warrants shall be adjusted by multiplying it by the ratio of the company's share price on TASE, adjusted for the distribution of the cash dividend, as prescribed by TASE (the “ex dividend rate”) and the closing rate set by TASE for the company's share on the aforesaid effective date.

•

If the company distributes a stock dividend between the date of issuance of the warrants and the end of the exercise period, immediately after the effective date of such distribution, the number of shares underlying the warrants shall increase by the number of shares to which such holder would have been entitled to as a result of the stock dividend, had such warrant holder exercised the warrants immediately before the effective date. A holder of warrants shall not be entitled to the allotment of a fraction of a share as a result of a stock dividend, but any fractions of shares that arise at the time of the allotment and that accrue to whole shares shall be sold on TASE by a trustee appointed for such purpose, within thirty (30) days of the date of such allotment, and the net consideration (after deduction of sales costs and mandatory payments and levies) shall be distributed among the warrant holders that would have

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received fractions of shares if so permissible, within fifteen (15) days of the date of sale. A check in the sum of less than NIS 50.00 (approximately $14) will not be sent to any warrant holder, and such sums may be collected at the offices of the company during regular office hours. A warrant holder which does not collect such amount at the offices of the company within twelve (12) months of the date of sale will lose any right to such payment.

•

In accordance with the rules, regulations and guidelines of TASE, the aforementioned methods of adjustment may not be amended.

The company shall file an immediate report on the ISA’s reporting system (MAGNA) and on a Current Report on Form 8-K regarding any adjustment of the exercise price of the warrants or in the number of shares underlying the warrants, before the commencement of trading on the date following such adjustment.

Notices to Warrant Holders

In the event of a resolution of the voluntary winding up of the company, the company shall publish a notice of such winding up in two (2) daily newspapers in Hebrew of broad circulation in Israel, and will publish a Current Report on Form 8-K in the United States. Each warrant holder shall be deemed to have exercised its warrants prior to the adoption of the resolution (without the need for prior payment of the exercise price), unless any such warrant holder gives notice in writing to the company within thirty (30) days of the date of such publication, of its waiver of the right to exercise the warrants. If a warrant holder does not give such notice within the prescribed time period, the warrant holder shall be entitled to the sum that it would have obtained upon the winding up of the company as a holder of the shares underlying the warrants held by it, less the exercise price for such warrants, if any balance remains for distribution to such warrant holder.

The company shall make copies of the periodic reports and interim financial statements available for the inspection by the warrant holders at its registered office, during regular business hours. At the written request by a warrant holder, the company shall send such warrant holder a copy of its periodic reports and interim financial statements.

Not later than three weeks and not earlier than four weeks prior to the end of the exercise period, the company shall submit an immediate report on TASE’s reporting system in which it shall give notice of the end of the exercise period, noting the final date for exercise of the warrants and the exercise price of the warrants, and shall publish such a notice in two (2) daily newspapers in Hebrew with broad circulation in Israel.

Any notice from the company to warrant holders shall be published in an immediate report on TASE’s reporting system, in two (2) daily newspapers in Hebrew with broad circulation in Israel, and on a Current Report on Form 8-K in the United States, and shall be deemed to have been delivered to them on the date of such publication in the newspaper.

Amendment of Rights of Warrants and Meetings of Warrant Holders

Following the prior approval of a separate general meeting of the warrant holders by holders of 75% of the outstanding warrants present at the meeting, the company may reach a settlement with the warrant holders with respect to any right or claim that they may have and/or make any amendment, alteration or arrangement of their rights or of any of the conditions of the warrants.

Notwithstanding the aforesaid, pursuant to the rules, regulations and guidelines of TASE, the terms of the warrants relating to the exercise period, the exercise price or the adjustment mechanism for the exercise price as linked to the base rate, or relating to methods of protection in the event of the allotment of shares as a result of a stock dividend, rights issuance and/or cash dividends may not be amended or modified, except for an amendment or modification relating to the exercise period, the exercise price and/or the adjustment mechanism for the exercise price of the warrants as linked to the base rate under settlement or arrangement proceedings approved by an Israeli court under Section 350 of the Israel Companies Law, 5759-1999. Under Section 350 of the Israel Companies Law, 5759-1999, the terms of the warrants may be amended with approval of an Israeli court and upon the approval of holders of 75% of the outstanding warrants present at a general meeting of the warrant holders.

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Registration No. 333-169584

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549

Amendment No. 7ToForm S-1 REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933

QUARK PHARMACEUTICALS, INC.

6501 Dumbarton Circle Fremont, CA 94555 (510) 402-4020

Daniel Zurr, Ph.D. Chief Executive Officer 6501 Dumbarton Circle Fremont, CA 94555 (510) 402-4020

Robert L. Jones Michael E. Tenta Cooley LLP 3175 Hanover Street Palo Alto, CA 94304-1130 (650) 843-5000

SUBJECT TO COMPLETION, DATED MARCH 24, 2011

PRELIMINARY PROSPECTUS

QUARK PHARMACEUTICALS, INC.

Minimum Offering of 30,000 UnitsMaximum Offering of 45,000 Units Each Unit consisting of 100 Shares of Common Stock and 50 Warrants

QUARK PHARMACEUTICALS, INC. TABLE OF CONTENTS

SUMMARY

Our Business

RNAi Overview

Our Approach

Our Product Candidates

siRNA Technology Development

Israeli National siRNA Project Consortium

Our License Agreement with Pfizer

Our Option Agreement with Novartis

Corporate Information

THE OFFERING

The Auction Process

SUMMARY FINANCIAL DATA

RISK FACTORS

Risks Related to Our Business

Our success is dependent on the success of our lead product candidates, PF-655, QPI-1002 and QPI-1007, and we cannot be certain that they will achieve success in clinical trials, that they will receive regulatory approval or be successfully commercialized.

Other than PF-655, QPI-1002 and QPI-1007, all of our other programs are in preclinical studies or early stage research. If we are unable to develop and commercialize our early stage product candidates, our business will be adversely affected.

There is a limited amount of information upon which you can evaluate our business and prospects.

We have a history of losses and may never be profitable.

We will require substantial additional funds to continue our research and development activities. If additional funds are not available we may need to significantly scale back or cease our operations.

Because we have licensed some of our drug candidates to third parties, we are more dependent on third parties for the successful development and commercialization of those drug candidates.

RNAi-based drug development is unproven and may never lead to marketable products.

Any failure or delay in completing clinical trials for our product candidates could severely harm our business.

We may be unable to obtain U.S. or foreign regulatory approval and, as a result, be unable to commercialize our drug candidates.

Even if we obtain regulatory approvals, our marketed drugs will be subject to ongoing regulatory review. If we fail to comply with continuing U.S. and foreign regulations, we could lose our approvals to market drugs and our business would be seriously harmed.

Our product candidates may never achieve market acceptance even if we obtain regulatory approvals.

The pharmaceutical market is intensely competitive. If we are unable to compete effectively with existing drugs, new treatment methods and new technologies, we may be unable to commercialize any drugs that we develop.

It is difficult and costly to protect our proprietary rights, and we may not be able to ensure their protection.

We may incur substantial costs as a result of litigation or other proceedings relating to patent and other intellectual property rights.

If we fail to comply with our obligations under any inbound licenses or related agreements, we could lose license rights that are necessary for developing and protecting our RNAi technology and any related product candidates that we develop.

Confidentiality agreements with employees and others may not adequately prevent disclosure of trade secrets and other proprietary information.

We rely on third parties to conduct our clinical trials. If these third parties do not perform as contractually required or otherwise expected, we may not be able to obtain regulatory approval for or commercialize our product candidates.

We do not have manufacturing experience or resources and we must incur significant costs to develop this expertise or rely on third parties to manufacture our product candidates.

The loss of members of our management team could substantially disrupt our business operations.

We rely on highly skilled personnel and if we are unable to retain or motivate key personnel or hire qualified personnel, we may not be able to maintain our operations or grow effectively.

We lack marketing and commercialization experience for biopharmaceutical products and we may have to rely on third parties for these capabilities.

If any products we develop become subject to unfavorable pricing regulations, third-party reimbursement practices or healthcare reform initiatives, our business could be harmed.

We face potential product liability exposure, and if successful claims are brought against us, we may incur substantial liability for a product candidate and may have to limit its commercialization.

If we or our licensees, collaborators, manufacturers or service providers fail to comply with applicable laws and regulations, we or they could be subject to enforcement actions, which could affect our ability to market and sell our products and may harm our reputation.

We are subject to foreign exchange risk.

We may incur significant costs complying with environmental laws and regulations, and failure to comply with these laws and regulations could expose us to significant liabilities.

We have significant operations in Israel, which may be adversely affected by acts of terrorism or major hostilities.

We are subject to the risk of natural disasters, including earthquakes.

Risks Related to the Units, Our Common Stock and this Offering

We are selling this offering without an underwriter and may be unable to sell any units. Unless we are successful in selling the units and receiving the proceeds from this offering, we may have to seek alternative financing to implement our business plans.

The market price of our common stock may be highly volatile, and you may not be able to resell your shares at or above the price you paid for them in this offering.

The TASE members accepting orders in the auction process will not be bound by suitability protections for customers purchasing the units akin to FINRA Rule 2310.

Our largest shareholder and management beneficially own a significant percentage of our stock and will be able to exercise significant influence over matters subject to shareholder approval.

We will incur significant increased costs as a result of operating as a public company, and our management will be required to devote substantial time to new compliance initiatives.

Future sales of our common stock in the public market could cause our stock price to fall.

Anti-takeover provisions in our charter documents and under California and Israeli law could make an acquisition of us, which may be beneficial to our shareholders, more difficult and may prevent attempts by our shareholders to replace or remove our current management.

If you purchase shares of common stock sold in this offering, you will experience immediate dilution. You will experience further dilution if we issue shares in future financing transactions or upon exercise of options or warrants.

Because our management will have broad discretion over the use of the net proceeds from this offering, you may not agree with how we use them and the proceeds may not be invested successfully.

We have not declared any dividends on our common stock to date, and we have no intention of declaring dividends in the foreseeable future.

Risks Related to the Auction Process for Our Offering

The auction process may result in a phenomenon known as the “winner’s curse,” and, as a result, investors may experience significant losses.

Successful bidders may receive the full number of units subject to their bids, so potential investors should not make bids for more units than they are prepared to purchase.

If research analysts publish or establish target prices for our common stock that are below the offering price for our units or the then current trading market price of our shares, the price of our shares of common stock may fall.

The mechanics of our bid process make it difficult for persons not having an account with a TASE member at the time of the bid process to place a bid for our units.

Some TASE members may not accept a prospective investor’s bid, unless certain credit conditions, determined by the TASE member, are satisfied.

The amount of proceeds from this offering is dependent upon the outcome of the auction process.

FORWARD-LOOKING STATEMENTS

USE OF PROCEEDS

DIVIDEND POLICY

CAPITALIZATION

DILUTION

SELECTED FINANCIAL DATA

MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

Amendment No. 7
To
Form S-1
REGISTRATION STATEMENT
UNDER
THE SECURITIES ACT OF 1933

6501 Dumbarton Circle
Fremont, CA 94555
(510) 402-4020

Daniel Zurr, Ph.D.
Chief Executive Officer
6501 Dumbarton Circle
Fremont, CA 94555
(510) 402-4020

Robert L. Jones
Michael E. Tenta
Cooley LLP
3175 Hanover Street
Palo Alto, CA 94304-1130
(650) 843-5000

Minimum Offering of 30,000 Units
Maximum Offering of 45,000 Units
Each Unit consisting of 100 Shares of Common Stock and 50 Warrants

QUARK PHARMACEUTICALS, INC.

TABLE OF CONTENTS

MANAGEMENT’S DISCUSSION AND ANALYSIS
OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

QUARK PHARMACEUTICALS INC S-1/A