POWER OF ATTORNEY

Know all by these presents, that the undersigned hereby authorizes

Elizabeth A. Czerepak, the Chief Financial Officer of Cancer Genetics, Inc. (the

"Company"), the undersigned's true and lawful attorney-in-fact to:

(1) execute for and on behalf of the undersigned, in the undersigned's

capacity as an officer and/or director of the Company, Forms 3, 4, and

5 in accordance with Section 16(a) of the Securities Exchange Act of

1934, as amended, and the rules thereunder;

(2) do and perform any and all acts for and on behalf of the

undersigned which may be necessary or desirable to complete and execute

any such Form 3, 4, or 5, complete and execute any amendment or

amendments thereto, and timely file such form with the United States

Securities and Exchange Commission and any stock exchange or similar

authority; and

(3) take any other action of any type whatsoever in connection with the

foregoing which, in the opinion of such attorney-in-fact, may be of

benefit to, in the best interest of, or legally required by, the

undersigned, it being understood that the documents executed by such

attorney-in-fact on behalf of the undersigned pursuant to this Power of

Attorney shall be in such form and shall contain such terms and

conditions as such attorney-in-fact may approve in such

attorney-in-fact's discretion.

The undersigned hereby grants to the foregoing attorney-in-fact full

power and authority to do and perform any and every act and thing whatsoever

requisite, necessary, or proper to be done in the exercise of any of the rights

and powers herein granted, as fully to all intents and purposes as the

undersigned might or could do if personally present, with full power of

substitution or revocation, hereby ratifying and confirming all that such

attorney-in-fact, or such attorney-in-fact's designated substitute or

substitutes, shall lawfully do or cause to be done by virtue of this Power of

Attorney and the rights and powers herein granted. The undersigned acknowledges

that the foregoing attorney-in-fact, in serving in such capacity at the request

of the undersigned, is not assuming, nor is the Company assuming, any of the

undersigned's responsibilities to comply with Section 16 of the Securities

Exchange Act of 1934, as amended, and the rules thereunder.

This Power of Attorney shall remain in full force and effect until the

undersigned is no longer required to file Forms 3, 4, and 5 with respect to the

undersigned's holdings of and transactions in securities issued by the Company,

unless earlier revoked by the undersigned in a signed writing delivered to the

foregoing attorney-in-fact.

IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney to

be executed as of this 11 day of February, 2013.

/s/ Edmund M. Cannon

-------------------------------------------

Signature

Edmund M. Cannon

----------------------------------------

Name

CANCER GENETICS, INC 4