7. Patients in late chronic phase (i.e., time from diagnosis to treatment >6 months), or blast phase are excluded. The definitions of CML phases are as follows: A. Early chronic phase: time from diagnosis to therapy </= 6 months; B. Late chronic phase: time from diagnosis to therapy > 6 months; C. Blastic phase: presence of 30% blasts or more in the peripheral blood or bone marrow; D. Accelerated phase CML: presence of any of the following features: Peripheral or marrow blasts 15% or more; Peripheral or marrow basophils 20% or more; Thrombocytopenia < 100 x 10(9)/L unrelated to therapy; Documented extramedullary blastic disease outside liver or spleen.