Bristol-Myers Squibb Company announced that the U.S. Food and Drug Administration (FDA) has granted Breakthrough Therapy Designation for ORENCIA® (abatacept) for the prevention of moderate to severe acute graft-versus-host disease (GvHD) in hematopoietic stem cell transplants from unrelated donors. There are no approved therapies for the prevention of acute GvHD, a potentially life-threatening medical complication that can impact patients receiving such transplants for the treatment of certain genetic diseases and hematologic cancers.