Idenix Pharmaceuticals Announces Completion of Proof-of-Concept Study for IDX899 in Treatment-Naive HIV-Infecte... (

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Idenix Pharmaceuticals Announces Completion of Proof-of-Concept Study for IDX899 in Treatment-Naive HIV-Infected Patients

Date:9/4/2008

- 100 mg cohort demonstrates potent antiviral activity and favorable safety

profile -

CAMBRIDGE, Mass., Sept. 4 /PRNewswire-FirstCall/ -- Idenix Pharmaceuticals, Inc. (Nasdaq: IDIX), a biopharmaceutical company engaged in the discovery and development of drugs for the treatment of human viral and other infectious diseases, today announced that it has completed the proof-of-concept study evaluating IDX899, a non-nucleoside reverse transcriptase inhibitor (NNRTI) being developed for the treatment of HIV-1. Data from the study demonstrate that the 100 mg/day cohort achieved a mean plasma viral load reduction of 1.87 log10 after seven days of treatment, similar to the potency observed with the other evaluated doses of 800 mg, 400 mg and 200 mg/day in this study. As with the other cohorts, no treatment-related serious adverse events were reported for any of the patients receiving 100 mg/day of IDX899 and no patients discontinued the study.

"We are pleased that HIV-1-infected patients receiving IDX899 in this trial achieved potent viral suppression at all doses tested," said Douglas Mayers, M.D., Idenix's chief medical officer. "With the promising antiviral activity and safety profile seen to date, especially at low doses, we believe that IDX899 could become an important part of combination antiretroviral therapy."

The phase I/II clinical trial was designed to evaluate the safety, tolerability, antiviral activity and pharmacokinetics of IDX899. Four cohorts of 800 mg/day, 400 mg/day, 200 mg/day and 100 mg/day were completed with ten HIV-1-infected treatment-naive patients randomized 8:2 in each cohort to receive oral once-daily IDX899 or matching placebo, respectively, for seven days.

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