急性髓系白血病Ki-67的表达及其临床意义

目的：探讨增殖相关抗原Ki-67在急性髓系白血病（AML）中的表达及其临床意义。方法选取2012年10月至2016年1月首都医科大学附属复兴医院血液内科住院AML患者45例，其中初治36例，复发9例；以20例健康志愿者作为健康对照。采用流式细胞术（FCM）检测骨髓原始细胞群Ki-67抗原的表达，分析Ki-67水平与患者临床特征的相关性。结果初治、复发AML患者和健康对照者的骨髓原始细胞群Ki-67阳性率分别为（10.38±8.41）%、（20.99±11.49）%和（40.77±11.97）%，初治和复发AML患者的Ki-67阳性率均低于健康对照者（均P＜0.05），初治AML患者Ki-67阳性率低于复发AML患者（P＝0.006）。初治AML患者的Ki-67水平与患者的年龄、FAB亚型、白细胞计数、有无骨髓增生异常综合征（MDS）病史、乳酸脱氢酶水平、骨髓原始细胞比例、NPM1基因突变、FLT3内部串联重复（ITD）、染色体核型、诱导化疗反应均无关（均P＞0.05）。初治AML患者Ki-67高水平组与低水平组的总生存时间分别为（780±110）d和（788±118）d，两组差异无统计学意义（P＝0.927）。结论 AML患者原始细胞群增殖活性较健康对照低，检测Ki-67水平可能为临床选择细胞周期特异性化疗药物提供依据；对AML患者动态监测Ki-67水平有助于监测疾病进展，预测复发。

Expression of Ki-67 in acute myeloid leukemia and its clinical significance

Objective To explore the expression and clinical significance of proliferation associated antigen Ki-67 in acute myeloid leukemia (AML). Methods A total of 45 AML patients (including 36 newly diagnosed AML patients and 9 recurrent AML patients) and 20 healthy volunteers (healthy group) were enrolled from October 2012 to January 2016 in Department of Hematology in Fuxing Hospital. The expression of Ki-67 in bone marrow blast cells were detected by flow cytometry (FCM). The relation between Ki-67 level and clinical characteristics, and the prognostic significance of Ki-67 were studied. Results The positive rate of Ki-67 in newly diagnosed AML, recurrent AML patients and healthy controls were (10.38±8.41)%, (20.99± 11.49) % and (40.77±11.97) %, respectively. The positive rate of Ki-67 in newly diagnosed AML patients or recurrent AML patients were significantly lower than that in healthy controls (all P<0.05). The positive rate of Ki-67 in newly diagnosed AML patients was significantly lower than that in recurrent AML patients (P=0.006). The level of Ki-67 in newly diagnosed AML patients did not significantly correlated with age, FAB subtype, white blood cell count, a history of myelodysplastic syndrome (MDS), level of lactate dehydrogenase (LDH), proportion of blats cells, NPM1 gene mutation, FLT3-internal tandem duplication (ITD) gene mutation, chromosome karyotype and response to induction therapy (all P>0.05). There was no significant difference of overall survival between high Ki-67 expression group and low Ki-67 expression group in newly diagnosed AML patients (780±110) d vs. (788±118) d, P=0.927]. Conclusions The proliferation of blast cells in AML patients is lower than that in healthy controls. Detecting the level of Ki-67 may provide a reference for choosing the cell cycle specific chemotherapy drugs in clinical practice. Monitoring Ki-67 during AML process contributes to monitoring disease progression and predicting recurrence.