The following video is part of our "Motley Fool Conversations" series, in which health-care editor/analyst David Williamson discusses topics around the investing world.

In this series, David takes a look at three health-care stocks that have doubled and examines whether they can keep it going for the rest of the year. Today's edition features Pharmacyclics, with BTK inhibitor ibrutinib, Affymax, which recently received approval for Omontys, and the ongoing march of XOMA's 052 drug candidate through clinical trials. Can these stocks keep running? Watch and find out.

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David Williamson and The Motley Fool own shares of Johnson & Johnson. Motley Fool newsletter services recommend Johnson & Johnson. 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.