This episode of The Motley Fool's Market Checkup dives into the hottest headlines, looks at the biggest market movers in the health-care sector, and discusses the implementation of the Affordable Care Act, also known as Obamacare.

In this segment, analysts David Williamson and Max Macaluso discuss the reasons behind today's 40% drop in shares of Ariad Pharmaceuticals (NASDAQ: ARIA), an oncology-focused biotech company that is facing major headwinds regarding its chronic myeloid leukemia drug Iclusig.

Game-changing biotechs