William Blair initiated coverage of Mersana Therapeutics (MRSN) with an Outperform rating. Published first on TheFly – the ultimate source for real-time, market-moving breaking financial news. Try Now>> See today’s best-performing stocks on TipRanks >> Read More on MRSN: Mersana Therapeutics Updates Investor Presentation Online Biotech Alert: Searches spiking for these stocks today Mersana Therapeutics selloff on data overdone, says BTIG Mersana Therapeutics Gains Fast Track for Emi-Le Mersana Therapeutics: FDA grants additional Fast Track designation to XMT-1660 Disclaimer & DisclosureReport an Issue