No. 1: Pharmasset (VRUS)
No surprise, right? Pharmasset's $11 billion ($137-per-share) takeover by Gilead Sciences (GILD - Get Report) last month was just icing on Pharmasset's very sweet year. The company's experimental pill PSI-7977, with its potential to eliminate the need for weekly interferon injections from hepatitis C therapy, could soon dominate a $20 billion treatment market.
The stock: Pharmasset shares rose a stunning 468% this year, as of Dec. 16.>>To see these stocks in action, visit the Five Drug Stock Winners of 2011 portfolio on Stockpickr. --Written by Adam Feuerstein in Boston.
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