Pharmasset, Inc. (Nasdaq: VRUS) announces the initiation of a 28-day Phase 2a study with PSI-7977, a chirally pure isomer form of PSI-7851, a nucleotide analog polymerase inhibitor in development for the treatment of chronic hepatitis C (HCV). The trial will evaluate various doses of PSI-7977 in combination with Pegasys (peginterferon alfa 2a) and Copegus (ribavirin) in patients with HCV genotype 1 who have not been treated previously. "We recently reported encouraging clinical results with PSI-7851," said Michelle Berrey, MD, MPH, Pharmasset's Chief Medical Officer... 
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