Every time one of these drugs trials fails a bunch of people want to sue. There is nothing to sue about! The drug was less effective than hoped and that is that. I bet within days (or hours) there will be news releases from ambulance-chaing law firms looking to start a suit. In the end, they'll bleed everyone dry and maybe the "winners" will get back 10 cents a share. You invested, it didn't work out, learn from this and either hold or move on.