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Raptiva

The FDA announced yesterday that Genentech was withdrawing the psoriasis drug Raptiva because of a potential risk to patients of developing progressive multifocal leukoencephalopathy (PML), a rare, serious, progressive neurologic disease caused by a virus that affects the central nervous system.  There is no known effective treatment for PML. About 2,000 people in the U.S. are believed to be taking the drug.

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