Patient activity will encompass approximately 48 months: an approximate 24 month enrollment period, followed by 6 to 12 months of patient treatment. Patients will be followed for 1 year following completion of study drug treatment. During follow-up, bone marrow biopsies to confirm disease status should be obtained if peripheral blood blasts are present or if there is development of unexpected blood abnormalities to warrant suspicion of relapse, or at a minimum of every 6 months.