The Rosen Law Firm announces that it is investigating potential securities fraud claims against Catalyst Pharmaceutical Partners, Inc. (NASDAQ: CPRX) resulting from allegations that the Company may have concealed that a competitor has been providing patients for free with a drug that is nearly biologically equivalent to the drug for which Catalyst seeks FDA approval Catalyst is a development-stage company whose major product is Firdapse. Catalyst seeks FDA approval to sell Firdapse to treat Lambert-Eaton Myasthenic Syndrome ("LEMS"), a serious condition which only affects a few thousand people in the U.S. But a competitor, Jacobus Pharmaceuticals, makes 3,4-DAP, a drug substantially equivalent to Firdapse. And on October 18, 2013, Adam Feuerstein (a journalist) revealed that Jacobus has been providing 3,4-DAP to patients, for free, pursuant to a number of compassionate use programs, for twenty years. That day, Catalyst's stock price fell from $2.61 to $1.90 on heavy volume, damaging investors. The Rosen Law Firm is preparing a securities class action lawsuit on behalf of CPRX investors. If you purchased STSI stock before October 18, 2013, please visit the website at http://rosenlegal.com for more information. You may also contact Jonathan Horne, Esq., or Phillip Kim, Esq. of The Rosen Law Firm toll free at 866-767-3653 or via e-mail at email@example.com or firstname.lastname@example.org. The Rosen Law Firm represents investors throughout the globe, concentrating its practice in securities class actions and shareholder derivative litigation. Attorney Advertising. Prior results do not guarantee a similar outcome.