Bristol-Myers Squibb Company Release: New 12 Week, Interferon-Free Treatment Arms Added to All-Oral Combination Study of PSI-7977 and Daclatasvir (BMS-790052) for HCV Genotype 1

PRINCETON, N.J.--(BUSINESS WIRE)--Pharmasset, Inc. (Nasdaq: VRUS) and Bristol-Myers Squibb Company (NYSE: BMY) announced today the addition of four treatment arms to the ongoing Phase IIa trial evaluating the combination of Pharmasset’s PSI-7977, a nucleotide polymerase inhibitor, and Bristol-Myers Squibb Company’s (NYSE: BMY) daclatasvir (BMS-790052), an investigational NS5A replication complex inhibitor, for the treatment of chronic hepatitis C (HCV). This trial is the result of a clinical collaboration agreement between Pharmasset and Bristol-Myers Squibb announced in January 2011.