ARIAD Pharmaceuticals announced twelve-month follow-up data from the pivotal PACE trial of ponatinib, its investigational BCR-ABL inhibitor, in heavily pretreated patients with resistant or refractory chronic myeloid leukemia, CML, or Philadelphia chromosome-positive acute lymphoblastic leukemia (Ph+ ALL). The study now shows that 56 percent of chronic-phase CML patients in the trial, including 70 percent of patients with a T315I mutation, achieved a major cytogenetic response (MCyR), the primary end-point for chronic-phase CML patients. The data are being featured today at 4:30 p.m., ET, in an oral presentation at the 54th Annual Meeting of the American Society of Hematology, ASH, being held in Atlanta, Georgia. ARIAD filed for regulatory approval of ponatinib in the third quarter of 2012 in the U.S. and in the E.U. based on clinical data from the pivotal PACE trial.