Reuters - Tue Sep 15, 2009
By Toni Clarke
BOSTON, Sept. 15 (Reuters) - Biogen Idec Inc (BIIB.O) said on Tuesday it would be premature to conclude that the risk of developing a potentially deadly brain infection increases the longer patients take its multiple sclerosis drug Tysabri.
The company told investors at the Morgan Stanley healthcare conference that despite two new reports of patients who have developed progressive multifocal leukoencephalopathy, or PML, it is too early to draw any specific conclusion.
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