MELBOURNE, Australia & MENLO PARK, Calif.--(BUSINESS WIRE)--ChemGenex Pharmaceuticals Limited (ASX: CXS) announced today it has agreed with the U.S. Food and Drug Administration (FDA) on a potential regulatory path to progress OMAPRO™ (omacetaxine mepesuccinate) for the treatment of patients with Chronic Myeloid Leukemia (CML).