Objective: To determine the optimal cutoff value of Epstein-Barr virus (EBV) DNA load that can assist in the diagnosis of post-transplant lymphoproliferative disease (PTLD) after haploidentical hematopoietic stem cell transplantation (haplo-HSCT) . Methods: The data of patients with EBV infection after haplo-HSCT from January to December 2016 were retrospectively analyzed. Through constructing the receiver operating characteristic (ROC) curve and calculating the Youden index to determine the cutoff value of EBV-DNA load and its duration of diagnostic significance for PTLD. Results: A total of 94 patients were included, of whom 20 (21.3% ) developed PTLD, with a median onset time of 56 (40-309) d after transplantation. The median EBV value at the time of diagnosis of PTLD was 70,400 (1,710-1,370,000) copies/ml, and the median duration of EBV viremia was 23.5 (4-490) d. Binary logistic regression was used to analyze the peak EBV-DNA load (the EBV-DNA load at the time of diagnosis in the PTLD group) and duration of EBV viremia between the PTLD and non-PTLD groups. The results showed that the difference between the two groups was statistically significant (P=0.018 and P=0.001) . The ROC curve was constructed to calculate the Youden index, and it was concluded that the EBV-DNA load ≥ 41 850 copies/ml after allogeneic hematopoietic stem cell transplantation had diagnostic significance for PTLD (AUC=0.847) , and the sensitivity and specificity were 0.611 and 0.932, respectively. The duration of EBV viremia of ≥20.5 d had diagnostic significance for PTLD (AUC=0.833) , with a sensitivity and specificity of 0.778 and 0.795, respectively. Conclusion: Dynamic monitoring of EBV load in high-risk patients with PTLD after haplo-HSCT and attention to its duration have important clinical significance, which can help clinically predict the occurrence of PTLD in advance and take early intervention measures.
目的： 寻找可以协助诊断单倍体造血干细胞移植（haplo-HSCT）后淋巴细胞增殖性疾病（PTLD）的EB病毒DNA（EBV-DNA）载量及其持续时间的最佳临界值。 方法： 回顾性分析北京大学血液病研究所2016年1月至12月期间haplo-HSCT后合并EBV感染患者的相关数据，通过构建ROC曲线计算约登指数寻找对PTLD有诊断意义的EBV-DNA载量及其持续时间的临界值。 结果： 共纳入94例患者，其中20例（21.3%）发生PTLD，诊断PTLD时中位EBV-DNA载量为70 400（1 710~1370 000）拷贝/ml，EBV血症中位持续时间为23.5（4~490）d。二元logistic回归分析显示，PTLD组与非PTLD组两组间EBV-DNA最高载量及EBV血症持续时间差异均有统计学意义（P＝0.018，P＝0.001）。构建ROC曲线计算约登指数，EBV-DNA载量≥41 850拷贝/ml对PTLD有诊断意义[曲线下面积（AUC）＝0.847]，敏感度、特异度分别为0.611、0.932；EBV血症持续时间≥20.5 d对PTLD有诊断意义（AUC＝0.833），敏感度、特异度分别为0.778、0.795。 结论： 动态监测haplo-HSCT后PTLD高危患者的EBV载量及关注其持续时间有重要临床意义，有助于预测PTLD的发生并早期采取干预措施。.
Keywords: Epstein-Barr virus; Haploidentical hematopoietic stem cell transplantation; Post-transplant lymphoproliferative disease; Predict.