CD20阳性不提示高白细胞计数急性B淋巴细胞白血病患儿预后不良

目的 探讨初诊骨髓白血病细胞CD20表达联合白细胞计数在儿童B系急性淋巴细胞白血病（B-ALL）预后评估中的价值。方法 回顾性分析2008年4月至2015年4月接受CCLG-ALL2008方案治疗的821例初诊B-ALL患儿的临床资料，并随访观察其生存情况。结果 821例患儿中，CD20阴性患儿547例（66.6%），CD20阳性患儿274例（33.4%）。694例白细胞 < 50×10⁹/L（低白细胞计数）的患儿中，CD20阳性、CD20阴性患儿5年无事件生存（EFS）率分别为65.9%±3.2%、77.3%±2.0%（P=0.001），5年总生存（OS）率分别为78.3%±2.9%、87.5%±1.6%（P=0.005）；多因素分析示CD阳性是EFS率、OS率的独立危险因素（分别HR=1.634，P=0.001；HR=1.761，P=0.005）。127例白细胞≥50×10⁹/L（高白细胞计数）的患儿中，CD20阳性、CD20阴性患儿5年EFS率分别为64.3%±7.7%、53.7%±5.5%（P=0.135），5年OS率分别为81.4%±6.4%、58.6%±5.6%（P=0.022）；多因素分析示CD20阳性是OS率的独立保护因素（HR=0.367，P=0.016）。结论 接受CCLG-ALL2008方案治疗的B-ALL患儿中，初诊低白细胞计数、CD20阳性表达者长期预后较差，而初诊高白细胞计数、CD20阳性表达者有较好的生存趋势。

CD20 is not a poor prognostic factor for childhood B-lineage acute lymphoblastic leukemia with high white blood cell count

Objective To study the significance of CD20 combined with white blood cell (WBC) count at diagnosis in the prognosis assessment in children with B-lineage acute lymphoblastic leukemia (ALL). Methods A retrospective analysis was performed on the medical data of 821 B-ALL children who were treated with CCLG-ALL2008 regimen from April 2008 to April 2015. Their survival status was followed up. Results Among the 821 children, 547 (66.6%) were negative, while 274 (33.4%) were positive for CD20 expression. Among 694 children with WBC < 50×109/L (lower WBC count), the 5-year EFS rates were 65.9%±3.2% and 77.3%±2.0% for CD20 positive and negative patients respectively (P=0.001); the 5-year OS rates were 78.3%±2.9% and 87.5%±1.6% for CD20 positive and negative patients respectively (P=0.005); CD20 positive expression was an independent risk factor for EFS (HR=1.634, P=0.001) and OS (HR=1.761, P=0.005). Among 127 children with WBC > 50×109/L (higher WBC count), the 5-year EFS rates was 64.3%±7.7% and 53.7%±5.5% for CD20 positive and negative patients respectively (P=0.135); the 5-year OS rate was 81.4%±6.4% and 58.6%±5.6% for CD20 positive and negative patients respectively (P=0.022); CD20 positive expression was an independent protective factor for OS (HR=0.367, P=0.016). Conclusions In children with B-ALL who are treated with CCLG-ALL2008 regimen, those with CD20 positive expression in lower WBC count at diagnosis have a poor prognosis; however, those with CD20 positive expression in higher WBC count at diagnosis have a better long-time survival.