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Pharmasset Reports Preliminary Results of a 4-week Proof-of-Concept Combination Study of R7128 for the Treatment of Chronic Hepatitis C in Genotype 2 or 3 Non-Responders
Date:9/8/2008

in any dose cohort after 14 days of dosing.

In a 4-week Phase 1 combination study that was conducted in 81 treatment-naive patients chronically infected with HCV genotype 1, R7128 demonstrated significant short-term antiviral activity with safety and tolerability comparable to placebo with SOC. Results from the 500mg, 1500mg and 1000mg dose cohorts (cohorts 1, 2 and 3) in 81 treatment-naive patients chronically infected with HCV genotype 1 indicated:

Preliminary results with R7128 1000mg BID with SOC indicated patients achieved a mean 5.0 log10 IU/mL decrease in HCV RNA and 88% (22 of 25) patients achieved RVR.

Results with R7128 1500mg BID with SOC indicated patients achieved a mean 5.1 log10 IU/mL decrease in HCV RNA and 85% (17 of 20) patients achieved RVR

Results with R7128 500mg BID with SOC indicated patients achieved a mean 3.8 log10 IU/mL decrease in HCV RNA and 30% (6 of 20) patients achieved RVR.

Results with placebo with SOC indicated patients achieved a mean 2.9 log10 IU/mL decrease in HCV RNA and 18.75% (3 of 16) patients achieved RVR

About Hepatitis C

Hepatitis C is a blood-borne infectious disease of the liver and is a leading cause of chronic liver disease and liver transplants. The WHO estimates that nearly 180 million people worldwide, or approximately 3% of the world's population, are infected with HCV. The CDC has reported that almost four million people in the United States have been infected with HCV, of whom 2.7 million are chronically infected.

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 B virus (HBV), hepatitis C virus (HCV) and human immunodeficiency virus (HIV).

Pharmasset is currently developing three product candidates. Clevudine, for the treatment
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SOURCE Pharmasset, Inc.
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