Ruling on MS Drug Tysabri Delayed
In November 2004, the FDA approved Tysabri for sale to the approximately 350,000 people in the United States who suffer from MS, an incurable disease of the central nervous system.
But Elan and Biogen withdrew the drug three months later, after three people taking Tysabri in clinical trials contracted a rare, often fatal brain disease called progressive multifocal leukoencephalopathy, or PML. Two of them died. Both companies subsequently said they found no additional PML cases amon
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