Pain Therapeutics (NASDAQ: PTIE ): Comments from Pfizer 's (NYSE: PFE ) Thursday's Q3 earnings call regarding Pain Therapeutics' Remoxy — a form of oxycodone designed to reduce potential abuse — sent PTIE shares down 36% Thursday. Pfizer, which is partnering with PTIE, said Remoxy will have to undergo three more studies before an application for FDA approval on the drug is resubmitted. The studies are expected to be completed in March 2013, when Pfizer says it will make a "go/no-go decision" on the drug's fate. Also jarring investors was Pfizer's referral to Remoxy as a "challenging" asset