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Pharmasset Presents Results of 4-Week Combination Study of R7128 for the Treatment of Chronic Hepatitis C
Date:4/25/2008

percentages in a 4-week study that are similar to HCV protease inhibitors and has an encouraging short-term clinical safety profile. Longer-term studies of R7128 with Pegasys plus Copegus are needed to provide additional information about its potential to improve sustained virologic response (SVR) rates for HCV patients."

R7128 4-week Combination Study Overview

The 4-week Phase 1 combination clinical trial was a multiple center, observer-blinded, randomized and placebo-controlled study that was conducted in 50 treatment-naive patients chronically infected with HCV genotype 1. The primary objective was to assess the safety, tolerability and pharmacokinetics of R7128 in combination with Pegasys plus Copegus. The secondary objective was to evaluate the change in HCV RNA after 4 weeks of treatment.

The study investigated two oral dose levels of R7128, 500mg and 1500mg, each administered twice-daily (BID) with once-weekly injections of Pegasys plus Copegus BID. Each cohort of 25 patients was comprised of 20 patients receiving R7128 and 5 patients receiving placebo with Pegasys plus Copegus.

Antiviral Activity Summary

Placebo + R7128 500mg + R7128 1500mg +

Pegasys plus Pegasys plus Pegasys plus

Copegus Copegus Copegus

(n=10) (n=20) (n=20)

Mean Decrease in

HCV RNA (log10 IU/mL)

at 4 Weeks -2.95 -3.82 -5.12

Percentage of Patients

with Undetectable

HCV RNA (<15 IU/mL)

at 4 Weeks (RVR) 10% 30% 85%

Potent antiviral activity was demonstrated following 4 weeks of treatment with R7128 1500mg BID with Pegasys plus Copegus. These patients achieved a mean 5.12 log10 IU/mL decrease in HCV RNA and 85% (17 of 20) had undetectable
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SOURCE Pharmasset, Inc.
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3. Pharmasset Announces R7128 Achieves 85% Rapid Virologic Response in a 4-week Combination Study for the Treatment of Chronic Hepatitis C
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5. Pharmasset Commences Dosing in 28-Day Combination Study of R7128 with Pegasys(R) plus Copegus(R) for Hepatitis C
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