 - Patients in the favorable cytogenetics group t8;21, inv16 or t16;16 and Leukocyte index 20 at diagnosis LIwhite blood cell count WBC x blasts in bone marrow100 are treated with one course of high-dose cytarabine 3gm212h, intravenous, days 1, 3 and 5, but in case of LI20 at diagnosis the intention is to perform an autologous peripheral blood stem cell PBSC transplantation. 