Subjects will receive FF-10501-01 orally on a twice daily schedule for 14, 21 or 28 days repeated every 28 days (=1 cycle). Disease assessments, including analysis of blood and bone marrow aspirates, will be performed at the end of Cycle 1 and every 2 cycles thereafter. Subjects who demonstrate objective response or stable disease will be allowed to continue therapy with FF-10501-01 until progression of disease, observation of unacceptable adverse events, intercurrent illness or changes in condition that prevent further study participation.