We report a patient with chronic myelogenous leukemia that responded to imatinib mesilate after relapse of blastic crisis following allogeneic bone marrow transplantation. The patient received an unrelated bone marrow transplantation in the 3rd chronic phase, after which the 3rd blastic crisis occurred 5 months later. Since the case was refractory to chemotherapy at that time, imatinib mesilate (600 mg/day) was given, which resulted in a complete cytogenetical remission (CCR). The CCR has maintained for 11 months.
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