Ardea Biosciences Presents Phase 2a Antiviral Activity Data for Lead HIV Candidate, RDEA806 at XVII International AIDS ...(nd tolerabilityof once- and twice-daily ...),Health

Date:8/7/2008

nd tolerability of once- and twice-daily oral dosing regimens of RDEA806 versus placebo in 48 HIV-positive patients who were naive to antiretroviral treatment. Nine out of 12 patients in each of four cohorts received RDEA806. The primary efficacy end point was the change from baseline in plasma viral load. Results from all four cohorts showed a median reduction in plasma viral load at nadir of 1.8 - 2.0 log copies/mL. There were no serious adverse events, premature discontinuations, clinically relevant ECGs changes or drug-related rash reported in any cohort. The incidence of CNS side effects was similar between drug and placebo. Gastrointestinal side effects were most common, but these effects were generally transient and mild.

The presentation is available on the conference website (http://www.aids2008.org) and on the Company website (http://www.ardeabio.com) under the title "Antiviral activity of RDEA806, a novel HIV non-nucleoside reverse transcriptase inhibitor, in treatment of naive HIV patients."

About RDEA806

RDEA806 is a novel non-nucleoside reverse transcriptase inhibitor (NNRTI) for the potential treatment of HIV infection. Based on preclinical and clinical studies to-date, we believe that RDEA806 may have important competitive advantages compared to currently available NNRTIs. These include the potential for potent antiviral activity against a wide range of HIV viral isolates, including those that are resistant to efavirenz (Sustiva(R)) and other currently available NNRTIs; a high genetic barrier to resistance; no reproductive toxicity based on animal studies; the potential to be administered in a patient-friendly, oral dosing regimen; limited pharmacokinetic interactions with other drugs; and the ability to be co-formulated with other HIV antiviral drugs.

About Ardea Biosciences, Inc.

Ardea Biosciences, Inc., of San
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