What a difference a U.S. FDA advisory committee meeting can make. In the wake of the Peripheral and Central Nervous System Drugs Advisory Committee voting 7-2 Sept. 7 to recommend approval of Amylyx Pharmaceuticals Inc.’s amyotrophic lateral sclerosis (ALS) candidate, shares of the Cambridge, Mass.-based company (NASDAQ:AMLX) more than regained the value they lost in March when the same committee voted against approval of AMX-0035.