Biogen issues alert after 2 Rituxan deaths- The Boston Globe
By Stephen Heuser, Globe Staff | December 19, 2006
Biogen Idec Inc. said yesterday that two patients using its drug Rituxan have died of a rare brain infection, the same one that shadows its multiple sclerosis treatment Tysabri .

In a letter sent to doctors, Biogen and Genentech Inc., which co-markets Rituxan with the Cambridge drug maker, warned that the two patients had contracted fatal progressive multifocal leukoencephalopathy, or PML.MORE: The Boston Globe