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Pharmasset Initiates Phase 2b Clinical Trial of PSI-7977 for Chronic Hepatitis C Genotypes 1, 2, and 3
Date:8/24/2010

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Patients receiving PSI-7977 will discontinue treatment at week 24 if they achieve an extended RVR (eRVR), defined as HCV RNA below the limit of detection (<15 IU/ml) at week 4 and maintained until week 12. Patients who do not achieve an eRVR and all patients on placebo/SOC will continue on standard of care until week 48. Patients will be stratified by IL28B status to ensure balance across cohorts.

In addition, approximately 25 treatment-naive patients with HCV genotype 2 or 3 will be enrolled in a fourth, open label arm, receiving PSI-7977 400mg QD with SOC for 12 weeks, with no SOC follow-up. Patients will be followed for an additional 24 weeks after discontinuation of all therapy to assess SVR.

Pharmasset anticipates reporting interim data from this trial in the first half of 2011.

About Pharmasset Pharmasset is a clinical-stage pharmaceutical company committed to discovering, developing, and commercializing novel drugs to treat viral infections. Pharmasset's primary focus is on the development of oral therapeutics for the treatment of hepatitis C virus (HCV) and, secondarily, on the development of Racivir(TM) for the treatment of human immunodeficiency virus (HIV). Our research and development efforts focus on nucleoside/tide analogs, a class of compounds which act as alternative substrates for the viral polymerase, thus inhibiting viral replication. We currently have four clinical-stage product candidates. RG7128, a cytosine nucleoside analog for chronic HCV infection, is in two Phase 2b clinical studies in combination with Pegasys(R) plus Copegus(R) and is also in the INFORM studies, the first series of studies designed to assess the potential of combinations of small molecules without Pegasys(R) and Copegus(R) to treat chronic HCV. These clinical studies are being conducted through a strategic collaboration with Roche. Our other clinical stage HCV candidates include PSI-7977, an unpartnered uracil nucleotide analog that
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SOURCE Pharmasset, Inc.
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3. Pharmasset Commences Dosing in 28-Day Combination Study of R7128 with Pegasys(R) plus Copegus(R) for Hepatitis C
4. Pharmasset Announces Clevudine and R7128 Presentations at HEP-DART
5. 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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10. Pharmasset Nominates PSI-7851 as a Lead Development Candidate for the Treatment of Chronic Hepatitis C
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