多参数流式细胞术分析415例成人和儿童B-ALL白血病相关免疫表型

为了探讨FCM在微量残留病（MRD）检测中的意义，利用4—6组4色抗体组合，以CD45／SSC设门法对273例成人和142例儿童B系急性淋巴细胞白血病（B—ALL）患者进行了多参数流式细胞术（FCM）免疫分型检测和白血病相关免疫表型（leukemia associated immunophenotyping，LAIP）分析。结果表明：根据CD34和CD10的表达特点，可将B—ALL患者分为Ⅰ型（CD34^＋CD10^-）；Ⅱ型（CD34^＋CD10^＋）；Ⅲ型（CD34-CD10^＋）；Ⅳ型（CD34^-CD10^-）。Ⅰ型和Ⅱ型患者LAIP的阳性比例分别为100％和92％，但Ⅲ型患者LAIP阳性率只有79．2％，显著低于Ⅰ型和Ⅱ型患者。总体B—ALL患者LAIP的检出率为90％，成人与儿童组无明显差异。而利用CD34／CD10／CD19／CD45一组抗体，LAIP检出率达到77．6％。结论：90％成人和儿童B-ALL白血病患者具有LAIP，因此对这类患者适宜用多参数流式细胞术进行MRD监测。

Leukemia-Associated Immunophenotypes in 415 Childhood and Adult Patients with B Lineage Acute Lymphoblastic Leukemia by Multiparametric Flow Cytometry Analysis

To evaluate the significance of FCM in minimal residual disease (MRD) detection, the immunophenotyping and leukemia-associated immunophenotypes (LAIP) of leukemia cells from 273 adult and 142 childhood patients with B lineage acute lymphoblastic leukemia (B-ALL) were detected by four to six antibody combinations of 4-color CD45/SSC gating multiparametric flow cytometry (FCM). The results showed that the B-ALL patients could be classified into 4 subtypes based on different expression CD34 and CD10: subtype I (CD34(+)/CD10(-)), subtype II (CD34(+)/CD10(+)), subtype III (CD34(-)/CD10(+)), subtype IV (CD34(-)/CD10(-)). The LAIP was observed in 100% and 92% patients of subtype I and subtype II, respectively, whereas only 79.2% in subtype III. The incidence of LAIP in total B-ALL cases was 90% by using the antibodies detected in this investigation. There was no significantce different for incidence of LAIP between adult and pediatric patients. LAIP was observed in 77.6% of patients by labeling only CD34/CD10/CD19/CD45 4-color antibody combination. It is concluded that in 90% of childhood and adult B-ALL patients LAIP can be found, which suits MRD detection by multiparameter flow cytometry.