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Pharmasset Presents Clevudine and Racivir Data at the International,HIV Drug Resistance Workshop

PRINCETON, N.J., June 14, 2007 /PRNewswire-FirstCall/ -- Pharmasset, Inc. , a clinical-stage pharmaceutical company committed to discovering, developing and commercializing novel drugs to treat viral infections, announced today that scientific data presentations about Clevudine and Racivir were made during the 16th International HIV Drug Resistance Workshop being held in St. Michael, Barbados from June 12-15, 2007. The poster presentations are available in the "Events & Presentations" section of Pharmasset's website at http://www.pharmasset.com.

An in vitro study of Clevudine, expected to enter Phase 3 registration clinical trials for the treatment of hepatitis B virus (HBV), demonstrated that it does not inhibit human immunodeficiency virus (HIV). Since Clevudine has demonstrated no antiviral effect on HIV, it should not select for HIV mutations that will have cross-resistance to HIV therapies. Thus, Clevudine may be useful for the treatment of HIV/HBV co-infected patients.

In addition, a clonal analysis of the Phase 2 viral samples for Racivir, being developed for the treatment of HIV, confirmed its antiviral activity in treatment-experienced patients with the M184V mutation and less than three thymidine analog mutations (TAMs). Thus, Racivir may be useful for the treatment of patients who have failed their first-line HIV therapy.

Anti-HIV Activity and Resistance Profiles of Entecavir Compared to Clevudine

Zennou V, Keilman M, Otto MJ, Furman P

Study Conclusion: Clevudine does not inhibit HIV in vitro. We have confirmed that entecavir has activity against wild type HIV-1 virus and that the M184V mutation confers resistance to entecavir. In addition, we showed that certain nucleoside-resistant HIV variants remain sensitive to entecavir. Thus, Clevudine may be useful for the treatment of HIV/HBV co-infected patients
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