Patients with Complete Remission (CR), Partial Remission (PR), marrow CR, Hematological Improvement (HI) or stable disease (SD) after 6 Cycles of therapy (IWG 2006 criteria) may receive 3 additional cycles. Response will be re-evaluated after 9 cycles. Patients with no response (NR) to treatment after 9 cycles will be withdrawn from the protocol. Patients with progression at any time will be withdrawn from the protocol after the last treatment Cycle.