Biotechnology Shares of US biotech firm Biogen Idec (Nasdaq: BIIB) fell as much as 8% to $138.05 in pre-market trading yesterday, after the company reported top-line results of EMPOWER, a Phase III trial investigating dexpramipexole in people with amyotrophic lateral sclerosis (ALS), showing that the drug did not meet its primary endpoint, a joint rank analysis of function and survival, and no efficacy was seen in the individual components of function or survival. The stock partially recovered to close down 1.4% at $147.86. 4 January 2013