Elan and partner Biogen Idec say that a Phase III trial of Tysabri produced positive results for patients with Crohn's disease, an inflammation of the gastrointestinal system. The results for the 510-patient study showed a reduction in symptoms after 12 weeks of treatment. That news produced only a modest uptick in Elan's stock, though, which has been hammered since the two companies removed Tysabri from the market after it was linked to two cases of the rare brain disease PML. Since then, two newspapers have reported additional possible cases of PML. Elan and Biogen Idec have steadfastly maintained that they can develop a strategy to get the drug safely back on the market and said they would submit the latest trial results to the FDA for its consideration.
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