Promyelocytic crisis of chronic myelogenous leukemia without t(15;17)

A case of promyelocytic crisis of chronic myelogenous leukemia is reported. The amount of promyelocytoid blasts in peripheral blood and bone marrow were 70% and 58%, respectively, at the onset of the blastic phase. Cytogenetic analyses during the blastic phase did not reveal t(15;17); however, t(3;21) in addition to the t(9;22) in the karyotype of bone marrow or peripheral blood cells was observed.