Pharmasset Commences Dosing in 28-Day Combination Study of R7128 with Pegasys(R) plus Copegus(R) for H...(er-blinded within-cohort randomizedplace...),Health

Date:10/3/2007

er-blinded, within-cohort randomized, placebo-controlled study being conducted in up to 75 treatment-naive patients with genotype 1 hepatitis C virus. The primary objective is to assess the safety, tolerability and pharmacokinetics of R7128 in combination with Pegasys plus Copegus. The secondary objective of Part 3 is to evaluate the short-term change in HCV RNA. The study will include two to three oral doses of R7128 (500 mg to 1500 mg) that are being administered twice-daily with Pegasys plus Copegus for 28 days.

Pegasys and Copegus are registered trademarks of Roche.

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 hepatitis C virus (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.

Contact

Alan Roemer, Vice President

Investor Relations & Corporate Communications

alan.roemer@pharmasset.com

Office: (609) 613-4125

Forward-Looking Statements

Pharmasset "Safe Harbor" Statement under the Private Securities Litigation Reform Act of 1995: Statements in this press release regarding our business that are not historical facts are "forward-looking statements" that involve risks and uncertainties, including without limitation the risk that adverse events could cause the cessation of the Phase 1 study and/or our development of R7128, the risk that our collaboration with Roche will not continue or will not be successful, the risk that the on-going or anticipated clinical trials for any one or more of our product candidates will not be successful or will not provide meaningful data and the risk that any one or more of our product candidates will n
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SOURCE Pharmasset, Inc. Copyright©2007 PR Newswire. All rights reserved

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