In the preceding video, Fool.com analyst David Williamson discusses today's three top movers in the health-care sector. First up is Threshold Pharmaceuticals, down 12% as it appears likely to come in second to Celgene (CELG)in the race to move competing pancreatic cancer drugs through phase 3 trials. Peregrine is another pharma in freefall, with shares down another 17% after already having lost 80% of its value in September. Finally, on the receiving end of some good news in this space is Novavax(NVAX -9.65%), up 8% today on no specific news, and up 35% YTD.

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