Abstract
A new case of t(3;17)(q26;q22) was observed in a Philadelphia-positive (Ph 1) chronic myelogenous leukemia in acceleration 1 month before occurrence of the blastic phase. Abnormal megakaryocytopoiesis and thrombopenia were noted, but blast cells did not express platelet markers. The same translocation was previously reported in three myeloproliferative disorders in acceleration or in the process of becoming acute. Translocations or inversions of chromosome 3 with breakpoint involving the band 3q26 were specifically associated with megakaryoblastic acute phase or abnormal megakaryocytopoiesis. This report confirms that the t(3;17)(q26;q22) is a specific nonrandom chromosomal abnormality associated with the acute nonlymphoblastic phase of myeloproliferative disorders and megakaryocytopoiesis dysfunction.
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