决定异体 CAR T 细胞排斥与扩增的细胞和分子机制
Cellular and molecular mechanisms determining allogeneic CAR T cell rejection and expansion.
英文原题:Aggressive Lymphoma after CD19 CAR T-Cell Therapy.
Aggressive Lymphoma after CD19 CAR T-Cell Therapy.
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一名复发性原发性中枢神经系统淋巴瘤患者接受替沙格列赛治疗后1个月,发生致命性、克隆性、自主增殖的CD4-CD8-CAR+外周T细胞淋巴瘤(PTCL)。PTCL具有克隆性T细胞受体重排;该重排在CAR-T 细胞制备所用单采产品中已可检测到,在自体移植前7个月的样本中也已存在。PTCL、用于CAR-T 细胞制备的单采样本以及自体移植样本中,均检测到CD34+干细胞及其后代细胞中的体细胞DNMT3A和TET2突变。PTCL还携带一项额外的体细胞TET2突变,该突变在CAR-T 细胞单采产品及最终CAR-T 细胞产品中均已以极低频率检出,提示克隆性造血参与了淋巴瘤发生。
The development of a fatal, clonal, autonomously proliferating CD4-CD8- chimeric antigen receptor (CAR)+ peripheral T-cell lymphoma (PTCL) occurred 1 month after a patient received treatment with tisagenlecleucel for relapsed primary central nervous system lymphoma. The PTCL had a clonal T-cell receptor rearrangement, which was already detectable in the apheresis product for CAR T-cell manufacturing and 7 months earlier for autologous transplantation.
Somatic DNMT3A and TET2 mutations in CD34+ stem cells and their progeny were detected in the PTCL, in the apheresis specimen that was obtained for CAR T-cell production, and in the autotransplant. The PTCL harbored an additional somatic TET2 mutation, which was already detectable in the CAR T-cell apheresis product and the final CAR T-cell product at very low frequencies, providing evidence that clonal hematopoiesis had contributed to lymphomagenesis.
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