UPDATE 3-Biogen scraps Alzheimer drug trials, wiping $17 billion off its market value By: Reuters: Company News March 21, 2019 at 10:15 AM EDT * Analysts question Biogen's growth prospects (Adds context, details, background) Read More >> Related Stocks: Astrazeneca Plc ADR Biogen Idec Eli Lilly Johnson & Johnson Merck & Co Pfizer Rogers Corp