观察供者抗CD19嵌合抗原受体T细胞(CAR-T)(HI19α-4-1BB-ζ CAR-T)治疗急性B淋巴细胞白血病(B-ALL)异基因造血干细胞移植(allo-HSCT)后复发患者的疗效及安全性。. The gene discussed is CD19; the disease is acute lymphoblastic leukemia.