临床儿科杂志 ›› 2026, Vol. 44 ›› Issue (6): 508-517.doi: 10.12372/jcp.2026.26e0038

• 论著 • 上一篇    下一篇

两种CD19/CD22双靶点CAR-T细胞治疗策略在儿童PAX5基因变异复发/难治性B细胞急性淋巴细胞白血病中的疗效对比研究

李月1,2, 谢志伟1, 汤燕静2, 李本尚1,2   

  1. 1 安徽医科大学第二附属医院儿科(安徽合肥 230601)
    2 上海交通大学医学院附属上海儿童医学中心血液肿瘤科(上海 201318)
  • 收稿日期:2026-01-19 修回日期:2026-04-18 录用日期:2026-04-22 出版日期:2026-06-15 发布日期:2026-06-04
  • 作者简介:第一联系人:

    李月负责数据管理和分析及初稿撰写。谢志伟、汤燕静、李本尚负责监督、审阅及决定最终稿。

  • 基金资助:
    项目基金:国家自然科学基金项目(81670174);项目基金:国家自然科学基金项目(81900158);项目基金:国家自然科学基金项目(82402624);安徽省健康研究计划(AHWJ 2024Ab0156);安徽医科大学科研基金(2022xkj049);安徽省科技厅临床医学研究转化专项(306238342022)

A comparative study on the efficacy of two CD19/CD22 dual-targeting CAR-T strategies in children with relapsed/refractory B-cell acute lymphoblastic leukemia with PAX5 gene variations

LI Yue1,2, XIE Zhiwei1, TANG Yanjing2, LI Benshang1,2   

  1. 1 Department of Pediatrics, Anhui Medical University Second Affiliated Hospital, Hefei 230601, Anhui, China
    2 Department of Hematology and Oncology, Shanghai Children's Medical Center, Shanghai Jiao Tong University School of Medicine, Shanghai 201318, China
  • Received:2026-01-19 Revised:2026-04-18 Accepted:2026-04-22 Published:2026-06-15 Online:2026-06-04

摘要:

目的 抗原逃逸(尤其CD19缺失)限制CD19靶向嵌合抗原受体T细胞(CAR-T)治疗儿童复发/难治性B细胞急性淋巴细胞白血病(R/R B-ALL)的疗效,PAX5基因变异可破坏CD19表达稳定性、增加复发风险。本研究旨在比较联合输注与双顺反子两种CD19/CD22双靶点CAR-T细胞治疗策略在PAX5基因变异R/R B-ALL患儿中的疗效。方法 回顾性分析2019年11月5日至2023年5月31日医院收治的PAX5基因变异R/R B-ALL患儿的临床资料。所有患儿被分为联合输注组(Co组)与双顺反子组(Bi组),经淋巴清除预处理后,输注CAR-T细胞(剂量2×106~10×106个细胞/kg)。主要研究终点为输注后30天完全缓解(CR)/微小残留病(MRD)阴性率、总生存期(OS)、无事件生存期(EFS)及治疗相关毒性,随访截止日期为2025年3月31日。结果 共纳入22例PAX5基因变异R/R B-ALL患儿,包括融合变异18例(81.8%)、缺失2例(9.1%)及错义变异2例(9.1%),6例(27.3%)患儿存在复杂核型(≥3种异常)。其中8例接受联合输注CAR-T治疗(Co组),14例接受双顺反子CAR-T治疗(Bi组)。患儿治疗时中位年龄5.57岁(范围1.31~14.85岁),其中男13例、女9例。Co组与Bi组患儿输注后30天CR率均为100%,且MRD均为阴性(MRD<0.01%)。中位随访时间26.5个月(范围5~66个月),22例患儿6个月、12个月、3年OS率分别为95.45%、90.91%、63.64%,6个月、12个月、3年EFS率分别为77.27%、54.55%、40.91%。Co组6个月、12个月、3年OS率分别为100%、87.5%、50%,Bi组为92.9%、92.9%、71.4%;Co组6个月、12个月、3年EFS率分别为75%、62.5%、37.5%,Bi组为78.6%、50%、42.9%,两组患儿OS、EFS率比较差异均无统计学意义(POS=0.411,PEFS=0.826)。共4例患儿在CAR-T治疗后接受异基因造血干细胞移植(allo-HSCT),移植组的6个月、12个月及3年OS率分别为100%、100%、50.0%,未移植组为94.4%、88.9%和66.7%;移植组6个月、12个月及3年EFS分别为75.0%、75.0%、50.0% ,未移植组为77.8%、50.0%、38.9%,两组间患儿的OS、EFS率比较差异均无统计学意义(POS=0.693,PEFS=0.553)。Co组和Bi组的≥3级细胞因子释放综合征发生率分别为25.0%和57.1%,免疫效应细胞相关神经毒性综合征发生率分别为25.0%和21.4%,均安全可控且未发生治疗相关死亡。结论 CD19/CD22双靶点CAR-T的联合输注与双顺反子策略,对PAX5基因异常R/R B-ALL患儿均具有良好的短期疗效及安全性,但3年EFS率仍处于较低水平,提示长期预后仍有待进一步改善。

关键词: CD19/CD22双靶点嵌合抗原受体T细胞, 复发/难治性B细胞急性淋巴细胞白血病, PAX5基因变异, 异基因造血干细胞移植

Abstract:

Objective Antigen escape, particularly CD19 loss, limits the efficacy of CD19-targeted chimeric antigen receptor T-cell (CAR-T) therapy in children with relapsed/refractory B-cell acute lymphoblastic leukemia (R/R B-ALL). PAX5 gene variations have been shown to disrupt CD19 expression stability and increase relapse risk. This study aimed to compare the therapeutic efficacy of two CD19/CD22 dual-targeting CAR-T strategies, namely co-infusion versus bicistronic construct, in children with R/R B-ALL harboring PAX5 gene variations. Methods A retrospective analysis was conducted on the clinical data of R/R B-ALL children with PAX5 gene variation admitted to the hospital from November 5, 2019 to May 31, 2023. The patients were divided into a co-infusion group (Co group) and a bicistronic group (Bi group). All children received lymphodepletion conditioning followed by CAR-T cell infusion at a dose ranging from 2×106 to 10×106 cells/kg. The primary endpoints included the 30-day complete remission (CR) rate, minimal residual disease (MRD) negativity rate, relapse rate, survival outcomes, and treatment-related toxicity. The follow-up cutoff date was March 31, 2025. Results A total of 22 children with R/R B-ALL and PAX5 gene variations were included, including 18 cases (81.8%) of fusion variations, 2 cases (9.1%) of deletions, and 2 cases (9.1%) of missense variations. Six children (27.3%) had complex karyotypes (≥ 3 abnormalities). Among them, 8 patients received combined infusion of CAR-T treatment (Co group), and 14 received bicistronic CAR-T treatment (Bi group). The median age of the children at the time of treatment was 5.57 years (ranging from 1.31 to 14.85 years), and there were 13 boys and 9 girls. The CR rate of children in both the Co group and the Bi group was 100% 30 days after infusion, and the MRD was negative in both groups (MRD<0.01%). The median follow-up time was 26.5 months (range 5 to 66 months). Among the 22 patients, the 6-month, 12-month and 3-year overall survival (OS) rates were 95.45%, 90.91% and 63.64%, respectively. Meanwhile, the 6-month, 12-month and 3-year event-free survival (EFS) rates were 77.27%, 54.55% and 40.91%, respectively. The 6-month, 12-month, and 3-year OS rates in the Co group were 100%, 87.5%, and 50%, respectively, while those in the Bi group were 92.9%, 92.9%, and 71.4%, respectively. The 6-month, 12-month, and 3-year EFS rates in the Co group were 75%, 62.5%, and 37.5%, respectively, and those in the Bi group were 78.6%, 50%, and 42.9%, respectively. There were no statistically significant differences in OS and EFS rates between the two groups (POS=0.411, PEFS=0.826). A total of 4 children received allogeneic hematopoietic stem cell transplantation (allo-HSCT) after CAR-T treatment. The 6-month, 12-month and 3-year OS rates in the transplantation group were 100%, 100% and 50.0%, respectively, while those in the non-transplantation group were 94.4%, 88.9% and 66.7%, respectively. The 6-month, 12-month and 3-year EFS rates in the transplantation group were 75.0%, 75.0% and 50.0%, respectively, while those in the non-transplantation group were 77.8%, 50.0% and 38.9%, respectively. There were no statistically significant differences in OS and EFS rates between the two groups (POS=0.693, PEFS=0.553). Regarding toxicity, the incidence of grade ≥3 cytokine release syndrome (CRS) was 25.0% and 57.1% in the Co and Bi groups, respectively; the incidence of immune effector cell-associated neurotoxicity syndrome (ICANS) was 25.0% and 21.4%, respectively. All adverse events were manageable and no treatment-related death occurred. Conclusions Both co-infusion and bicistronic CD19/CD22 dual-targeting CAR-T strategies exhibit favorable short-term efficacy and comparable safety profiles in pediatric R/R B-ALL with PAX5 variations. However, the 3-year EFS rate remains at a relatively low level, suggesting that the long-term prognosis still needs further improvement.

Key words: CD19/CD22 dual-targeting chimeric antigen receptor T-cell, relapsed/refractory B-cell acute lymphoblastic leukemia, PAX5 variation, allogeneic hematopoietic stem cell transplantation

中图分类号: 

  • R72