The FDA (the U.S. Food and Drug Administration) has not approved ACY-1215 as a treatment for any disease. ACY-1215 or ricolinostat is a histone deacetylase inhibitor, specifically HDAC6. The FDA has approved idelalisib as well as ibrutinib as treatment options for Relapsed or Refractory Chronic Lymphocyic Leukemia (CLL).