Triggering a wave of commentary over its import, Biogen Inc. on Jan. 29 said the FDA has extended to June 7 its review of a BLA for the experimental Alzheimer's disease therapy aducanumab after the company submitted additional analyses and clinical data, making for a major amendment to the application. The three-month delay, from an earlier assigned PDUFA date of March 7, followed a thumbs-down vote by agency advisors in November. It sparked both sunny optimism and a bit of pessimism about the program's prospects on Friday.