Entirely possible. This PR makes it sound like Roche intends to continue work on 191 though. http://www.nasdaq.com/aspx/stock-market-news-story.aspx?storyid=201010070242dowjonesdjonline000243&title=roche-broadens-hepatitis-c-franchise-with-drug-buy Most interesting quote Having full ownership of danoprevir increases our ability to rapidly develop combinations of our own hepatitis C compounds with molecules from other companies to maximize patient benefit."