Abstract
A 67-year-old Chinese woman presented with mediastinal B cell lymphoma in 1992 with incidental leukocytosis. Bone marrow and peripheral blood findings confirmed the diagnosis of chronic myeloid leukemia (CML). After combination chemotherapy and radiotherapy for lymphoma, her peripheral blood counts remained normal, and she refused further treatment for nearly six years. Frank hematologic relapse occurred in 1998 and low dose hydroxyurea was used, which was stopped after six months owing to cytopenia. She remained well without treatment at 12-year follow up. Retrospective Southern blot analysis confirmed BCR gene rearrangement in marrow in 1992 and 1998, but not in the lymphoma or the latest peripheral blood. Fluorescence in-situ hybridzation analysis showed no Philadelphia chromosome positive (Ph + ) cells in the peripheral blood at last (FISH) follow-up, but BCR/ABL remained detectable. The relevance of the concomitant occurrence of CML and lymphoma and the unusually favorable response of CML to chemotherapy to the pathogenesis of CML is discussed.
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