Gilead Sciences ($GILD) and its hep C juggernaut kept rolling in Q4, churning out street-beating sales of $4.9 billion. But it took strong growth overseas to overcome an expected falloff for Sovaldi and Harvoni in the U.S. While Gilead execs say there's lots of growth left in the hep C market, they acknowledged Tuesday that the company needs to be looking for M&A opportunities in areas such as oncology. Report