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Pharmasset Presents R7128 14-Day Monotherapy Study Results for the Treatment of Chronic Hepatitis C
Date:11/2/2007

ss (2) and upper respiratory infection (2). In subjects on placebo, the most commonly reported AEs were headache (4) and diarrhea (4).

R7128 Antiviral Activity Summary

R7128 demonstrated potent, dose-dependent antiviral activity across the four patient cohorts (8 active, 2 placebo per cohort) receiving 750 mg or 1500 mg administered either QD or BID for 14 days as monotherapy. Both the greatest mean and maximum decrease in HCV RNA from baseline were demonstrated in the patient cohort that received 1500 mg BID. R7128 demonstrated a mean HCV RNA decrease of -0.9 log10 IU/mL (87.4%), -1.5 log10 IU/mL (96.8%), -2.1 log10 IU/mL (99.2%) and -2.7 log10 IU/mL (99.8%) in patients receiving 750mg QD, 1500mg QD, 750mg BID and 1500 mg BID, respectively. All four dose groups reached nadir values at Day 15. A maximum -4.2 log10 IU/mL (99.9%) HCV RNA decrease was demonstrated in a patient following 14 days of monotherapy with 1500 mg BID of R7128, which was also below the level of detection (<15 IU/ml). There was no clinical evidence of viral rebound in any dose cohort during the 14 days of dosing, which provides early evidence of high genetic barrier for nucleoside inhibitors of NS5b polymerase.

Pharmasset is currently enrolling a 4-week Phase 1 clinical trial to evaluate R7128 in combination with Pegasys(R) (pegylated interferon) plus Copegus(R) (ribavirin) in up to 75 treatment-nave patients chronically infected with hepatitis C virus (HCV) genotype 1. The primary objective is to assess the safety, tolerability and pharmacokinetics of R7128 in combination with Pegasys plus Copegus. The secondary objective is to evaluate the short- term change in HCV RNA. The study will investigate up to three oral dose levels of R7128 (500 mg to 1500 mg) administered twice-daily with Pegasys plus Copegus for 4 weeks. Please see http://www.clinicaltrials.gov or e-mail clinic
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SOURCE Pharmasset, Inc.
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