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Abstract
A 37-year-old man with a newly diagnosed chronic myelogenous leukemia received induction therapy with hydroxyurea and interferon-alpha, and maintenance therapy with low-dose ara-C and interferon-alpha. Subsequent to a rapid hematological remission, a continuously aggravating pancytopenia with bone marrow aplasia developed which persisted after withdrawal of maintenance therapy. Bone marrow examination exhibited aplastic areas and residual hematopoiesis with impaired maturation; cytogenetically, there was a 100% persistence of Philadelphia chromosome-positive metaphases. By allogeneic bone marrow transplantation, a complete reconstitution of hematopoiesis was achieved.