Ardea Biosciences, Inc. to Present Data on HIV Non-Nucleoside Reverse Transcriptase Inhibitor and Two MEK Inhibitors at Upcoming Medical Conferences

SAN DIEGO, April 7, 2008 /PRNewswire-FirstCall/ -- Ardea Biosciences, Inc. today announced that data will be presented on its second generation non-nucleoside reverse transcriptase inhibitors (NNRTIs), at the 21st International Conference on Antiviral Research (ICAR). Additionally, data on two of the Company’s mitogen-activated ERK kinase (MEK) inhibitors, RDEA119 and RDEA436, will be presented at the American Association for Cancer Research (AACR) annual meeting.

About Ardea Biosciences, Inc.

Ardea Biosciences, of San Diego, California, is a biotechnology company focused on the discovery and development of small-molecule therapeutics for the treatment of HIV, cancer and inflammatory diseases, including gout. We have three drug candidates in clinical trials and several others in preclinical development and discovery. Our most advanced drug candidate is RDEA806, a non-nucleoside reverse transcriptase inhibitor (NNRTI), which is in a Phase 2a study for the treatment of HIV. We are also investigating RDEA806 for the treatment of gout. Our lead mitogen-activated ERK kinase (MEK) inhibitor, RDEA119, is in a Phase 1 study in advanced cancer patients and is being investigated for the treatment of inflammatory diseases. RDEA436, our second generation MEK inhibitor for the treatment of cancer and inflammatory diseases, has been evaluated in a human micro-dose pharmacokinetic study and has been selected as a development candidate. In addition to the foregoing clinical programs, we are developing a second generation NNRTI for HIV, as well as other drug candidates in earlier stages of preclinical development and discovery.

Statements contained in this press release regarding matters that are not historical facts are “forward-looking statements” within the meaning of the Private Securities Litigation Reform Act of 1995. Because such statements are subject to risks and uncertainties, actual results may differ materially from those expressed or implied by such forward-looking statements. Such statements include, but are not limited to, statements regarding: sufficiency of cash resources and our goals, including the expected properties and benefits of RDEA806, RDEA119, RDEA436 and our other compounds and the results of preclinical, clinical and other studies. Risks that contribute to the uncertain nature of the forward-looking statements include: risks related to the outcome of preclinical and clinical studies, risks related to regulatory approvals, delays in commencement of preclinical and clinical studies, and costs associated with internal development and in-licensing activities. These and other risks and uncertainties are described more fully in our most recently filed SEC documents, including our Annual Report on Form 10-K and our Quarterly Reports on Form 10-Q, under the headings “Risk Factors.” All forward-looking statements contained in this press release speak only as of the date on which they were made. We undertake no obligation to update such statements to reflect events that occur or circumstances that exist after the date on which they were made.

CONTACT: Edie DeVine of WeissComm Partners, +1-415-946-1081, for Ardea
Biosciences, Inc.

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