Biogen Inc.: New Data at AAN 2021 from Across Biogen's MS Portfolio Demonstrate Positive Impact of Treatment on People Living with Relapsing Multiple Sclerosis (natalizumab) can lead to meaningful improvements in mental and social health compared to Ocrevus (ocrelizumab) (diroximel fumarate) reinforce the treatment's positive gastrointestinal tolerability profile Biogen advances leading research to help inform future patient management including new information on the clinical profile of extended interval dosing with natalizumab CAMBRIDGE, Mass., April 16, 2021(Nasdaq: BIIB) today announced new data from its industry-leading portfolio of multiple sclerosis (MS) therapies to be presented at the American Academy of Neurology (AAN) 2021 Virtual Annual Meeting, April 17-22. The presentations include data on quality of life benefits and analyses of extended interval dosing (EID) with TYSABRI