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.

This edition focuses on two health-care stocks -- Threshold Pharmaceuticals and Arena Pharmaceuticals -- with sector-best returns so far this year. David highlights the two drugs propelling their multibagger performances, TH-302 and lorcaserin, but discusses whether shares can keep running throughout 2012. Watch and find out.

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David Williamson and The Motley Fool have no positions in the stocks mentioned above. 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.