Biogen still believes that aducanumab can win US Food and Drug Administration approval as the first disease-modifying treatment for Alzheimer’s disease, but external confidence in the company’s ability to achieve that goal in a timely manner was shaken on 22 April. That's when Biogen revealed in its first quarter earnings report that it does not expect to complete the biologic license application (BLA) for aducanumab until the third quarter of this year.
The company has said since October that it would file the BLA in early 2020, although Biogen’s guidance in January was less specific when executives indicated the filing would take place as soon as possible