>These safety vs. efficacy results make me wonder if Apixaban's dose wasn't too low.<
You could be right. The Apixaban doses being tested in phase-3 for VTE treatment (as opposed to VTE prevention) are higher than the 2.5mg BID dose in the failed ADVANCE-1 trial. For instance, the AMPLIFY trial uses a loading dose of 10mg BID followed by a maintenance dose of 5mg BID (#msg-29928836).
Moreover, the phase-2 trial of Apixaban vs warfarin in VTE prevention employed doses of 5mg BID, 10mg BID, and 20mg qD (#msg-21044973).
“The efficient-market hypothesis may be the foremost piece of B.S. ever promulgated in any area of human knowledge!”