4 Biotech Stocks That Doubled In 2014 By: TalkMarkets December 26, 2014 at 11:16 AM EST It has been an eventful year for the biotech sector with mergers and acquisitions (M&As) and deals showing no signs of slowing down. Read More >> Related Stocks: Achison Inc Agios Pharmaceuticals Ptc Therapeutics Tetraphase Pharmaceu