Public biopharmaceutical companies did manage to attract some investors off the sidelines in May with medical conference season getting into full gear. However, it was generally another lackluster month, with the Nasdaq Biotech index dropping 2% in the period in contrast to the broader markets with the Dow Jones Industrial Average growing by 2%. The sector, however, could get a significant boost in the next few days if the FDA gives the green light to Biogen Inc. and Eisai Co. Ltd.’s experimental Alzheimer’s disease therapy, aducanumab, a recombinant chimeric human IgG1 monoclonal antibody targeting beta-amyloid, that could be the first disease-modifying therapy for an indication that has seen no novel therapies approved in more than 15 years.