86例儿童急性淋巴细胞白血病三色流式细胞术免疫分型研究

目的 探讨儿童急性淋巴细胞白血病（ALL）三色流式细胞术免疫分型的特点。方法 采用CD45/SSC双参数散点图设门方法进行三色流式细胞术免疫表型分析。结果 CD45/SSC双参数散点图设门方法与FSC/SSC双参数散点图设门方法比较能将骨髓中的原始细胞与正常淋巴细胞、单核细胞及粒细胞明显分开，所得原始细胞经例与形态学分类接近，原始细胞免疫表型假阳性发生率低。86例儿童ALL标本中，B-ALL占95.3%，T-ALL占2.3%。Common-ALL和Pro-B-ALL分别占B-ALL的76.8%和6.1%。57.0%和34.9%的儿童ALL表达CD34和髓系抗原，其中以Pro-B-ALL分别占B-ALL的76.8%和6.1%。57.0%和34.9%的儿童ALL表达CD13和CD33的表达差异无显著性。结论 CD45/SSC双参数散点图设门方法排除了骨髓中正常细胞的干扰，免疫分型结果更可靠。儿童ALL有较高的CD34和髓系抗原表达。

Immunophenotyping of eighty six children with acute lymphoblastic leukemia by three-color flow cytometry

Objectives To evaluate the specificity of three-color flow cytometry in childhood acute lymphoblastic leukemia (ALL) immunophenotyping. Methods Immunophenotyping was performed by three-color flow cytometry analysis using CD 45/SSC gating. Results The percentage of blasts was correlated better with leukemic cell count compared with that of FSC/SSC, and the false positive results were low. Among eighty six cases of ALL, 95.3% was B-ALL, in which common-ALL and Pro-B-ALL were 76.8% and 6.1%, respectively, and 2.3% was T-ALL. CD 34 + and myeloid-associated antigen expression were observed in 57.0% and 34.9% of the cases, respectively, among which Pro-B-ALL was the commonest. CD 33 was more commonly expressed than CD 13 in Pro-B-ALL cases, but no difference in the expression between these two antigens in other subtypes. Conclusion Gating of CD 45/SSC eliminated effection of normal cells to blasts in bone marrow, with which the immunophenotyping results were more reliable.