US biotechnology major Biogen Idec and Irish drugmaker Elan says that the US Food and Drug Administration is due to rule on their co-developed multiple sclerosis drug Tysabri (natalizumab) by March and decide whether to re-approve the ill-fated predicted blockbuster with a label warning of the risk of progressive multifocal leukoencephalopathy, a rare but deadly brain disease. The firms recalled the drug in February 2005 after three cases of PML were reported (Marketletters passim).
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