Shares of Mersana Therapeutics, Inc. (MRSN) have gained 8.3% over the past four weeks to close the last trading session at $6.82, but there could still be a solid upside left in the stock if short-term price targets of Wall Street analysts are any indication. Going by the price targets, the mean estimate of$28.29 indicates a potential upside of 314.8%.The mean estimate comprises seven short-term price targets with a standard deviation of $16.09. While the lowest estimate of$8.00 indicates a 17.3% increase ...