作者报告了一例再生障碍性贫血骨髓移植后9个月发生供者细胞急性单核细胞型白血病患者,采用细胞遗传学分析及聚合酶链反应(PCR)证实白血病起源于供者细胞。患者男,19岁,因乏力和鼻衄而就诊,无病毒感染及接触溶血毒素史。经检查,血红蛋白2.0mmol/L(3.2g/dl),血小板3×10~9/L,白细胞数1.1×10~9/ The authors report a case of acute monocytic leukemia in a donor cell 9 months after transplantation of aplastic anemia. Cytogenetic analysis and polymerase chain reaction (PCR) confirmed the origin of leukemia in the donor cells. Male, 19 years old, presented with a history of fatigue and rhinitis without viral infection and exposure to hemolytic toxin. After examination, hemoglobin 2.0mmol / L (3.2g / dl), platelets 3 × 10 ~ 9 / L, the number of white blood cells 1.1 × 10 ~ 9 /