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Acute promyelocytic leukemia (APL), with specific features in cell morphology, is classified as M3 by French-American-British (FAB).Among M3, 95% of patients show specific chromosome translocation t(15;17)q(22;21) with PML-RAR α fusion gene, and 5% of patients show other subtypes. According to the statistical analysis of 2 540 adult acute myeloid leukemia (AML)cases in Harbin Institute of Hematology & Oncology, APL accounted for 23%.