Objective: This study aims to investigate the efficacy and safety of chimeric antigen receptor (CAR) T-cell bridging allogeneic hematopoietic stem cell transplantation (allo-HSCT) in the treatment of recurrent and refractory acute B-lymphocytic leukemia (R/R B-ALL) . Methods: A total of 50 R/R B-ALL patients who underwent CAR T-scell therapy to bridge allo-HSCT in the First Affiliated Hospital of Soochow University from January 2017 to May 2019 were retrospectively analyzed. The overall survival (OS) rate, event-free survival (EFS) rate, cumulative recurrence rate (CIR) , and transplant-related mortality (TRM) of patients with different bone marrow minimal residual disease (MRD) levels were analyzed before and after CAR T-cell infusion and before allo-HSCT. Results: The response rate of CAR T-cell therapy and the incidence rate of severe cytokine release syndrome were 92% and 28% , respectively. During 55 infusions, no treatment-related deaths occurred in any of the patients. The median time of CAR T-cell infusion to allo-HSCT was 54 (26-232) days, the median follow-up time after CAR T-cell infusion was 637 (117-1097) days, and the 1-year OS and EFS rates were (80.0±5.7) % and (60.0±6.9) % . The 1-year CIR and TRM after allo-HSCT were (28.0±0.4) % and (8.0±0.2) % . After CAR T-cell infusion and before allo-HSCT, patients with bone marrow MRD<0.01% had a significantly longer EFS [ (70.0±7.2) % vs (20.0±12.6) % , P<0.001; (66.7±7.5) % vs (36.4±14.5) % , P=0.008]and lower CIR [ (25.0±0.5) % vs (70.0±2.6) % , P<0.001; (23.08±0.47) % vs (45.45±2.60) % , P=0.038]. Conclusion: CAR T-cell therapy bridging allo-HSCT is safe and effective for recurrent and refractory B-ALL.
目的： 研究嵌合抗原受体T细胞（CAR-T）细胞治疗桥接异基因造血干细胞移植（allo-HSCT）治疗复发/难治急性B淋巴细胞白血病（R/R B-ALL）的疗效及安全性。 方法： 回顾性分析2017年1月至2019年5月于苏州大学附属第一医院行CAR-T细胞治疗桥接allo-HSCT的50例R/R B-ALL患者的临床资料，分析CAR-T细胞治疗前、后及allo-HSCT前不同骨髓微小残留病（MRD）水平患者总生存（OS）率、无事件生存（EFS）率、累积复发率（CIR）、移植相关死亡率（TRM）。 结果： 全部患者共行55例次CAR-T细胞治疗，CAR-T细胞治疗反应率、严重细胞因子释放综合征（CRS）发生率分别为92％、28％。未发生治疗相关死亡。CAR-T细胞输注至allo-HSCT的中位时间为54（26～232）d。CAR-T细胞输注后中位随访637（117～1097）d，1年OS、EFS率分别为（80.0±5.7）％、（60.0±6.9）％。移植后1年CIR、TRM分别为（28.0±0.4）％、（8.0±0.2）％。CAR-T细胞输注后及allo-HSCT前骨髓MRD<0.01％患者1年EFS率更高[（70.0±7.2）％、（20.0±12.6）％，P<0.001；（66.7±7.5）％对（36.4±14.5）％，P＝0.008]，CIR更低[（25.0±0.5）％、（70.0±2.6）％，P<0.001；（23.1±0.5）％、（45.4±2.6）％，P＝0.038]。 结论： CAR-T细胞治疗桥接allo-HCT对于复发/难治B-ALL是一种安全有效的治疗策略。.
Keywords: Allogeneic hematopoietic stem cell transplantation; Chimeric antigen receptors; Leukemia; Refractory; Relapsed.