TransThera Sciences (Nanjing) Inc...announced that the U.S. Food and Drug Administration (FDA) has granted Fast Track Designation to its phase II stage product TT-00420 for the treatment of patients with Cholangiocarcinoma (CCA) who have no standard treatment options....The grant of Fast Track Designation is primarily based upon the clinical results of TT-00420 in its completed phase I study, in which nine CCA patients were enrolled and treated with TT-00420 at different dose levels. Seven patients had at least one post treatment efficacy assessment. Two achieved PR and five achieved SD.