On Tuesday's edition of Market Checkup, Motley Fool health-care analyst David Williamson looks at the biggest winners and losers in health-care stocks today.

With Gilead's (NASDAQ:GILD) miraculous new hepatitis C treatment Sovaldi boasting a 90% cure rate, but an $84,000 price tag for the 12-week treatment, several protests have been staged against the prohibitively expensive price point. Now, pharmacy benefit managers led by Express Scripts (NASDAQ:ESRX), CVS Caremark (NYSE:CVS), and Catamaran (UNKNOWN:CTRX.DL) are also reported to be pushing back against Sovaldi's price tag.

In this segment, David discusses the vast superiorities Gilead's drug offers over the previous treatment, and tells investors why the protestors may not have much leverage here and the price point will probably hold.

David Williamson owns shares of Express Scripts. The Motley Fool recommends Catamaran, Express Scripts, and Gilead Sciences and owns shares of Catamaran and Express Scripts. Try any of our Foolish newsletter services free for 30 days. We Fools don't all hold the same opinions, but we all believe that considering a diverse range of insights makes us better investors. The Motley Fool has a disclosure policy.