A first-ever quantification of the risks to multiple sclerosis and Crohn’s disease patients who take Biogen Inc. and Elan Corp. PLC’s Tysabri (natalizumab) of developing the deadly, incurable infection progressive multifocal leukoencephalopathy may, along with a newly approved diagnostic, help alleviate anxiety among patients and health care providers.
“We see the inclusion in the Tysabri label of the exact risk of developing PML while on Tysabri as a strong positive as it could even drive Tysabri use in...
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