* PSI-7977 shows rapid viral suppression
* PSI-938 found to be well tolerated
Jan 6 Pharmasset Inc VRUS.O said interim
analyses of clinical studies of its two drugs for chronic
hepatitis C showed promise.
A mid-stage study of the drug, codenamed PSI-7977, showed
rapid viral suppression with all patients remaining below limit
of detection at the end of treatment. No serious adverse events
The drug was granted "fast track" designation in August.
Fast-track status is designed to expedite the review of drugs
to treat serious diseases and fill unmet medical needs.
The company said it expects to start a 24-week mid-stage
study of the drug in the second quarter of 2011.
An early-stage study of the drug, codenamed PSI-938, as a
monotherapy was found to be safe and well-tolerated, Pharmasset
The Princeton, New Jersey-based company's shares, which
have risen 50 percent in the last three months, closed at
$46.59 on Wednesday on Nasdaq.
(Reporting by Shravya Jain in Bangalore; Editing by Sriraj