探索供者来源靶向CD19或联合靶向CD22嵌合抗原受体T细胞(CAR-T细胞)治疗异基因造血干细胞移植后复发急性B淋巴细胞白血病(B-ALL)的有效性及安全性。. The gene discussed is CD22; the disease is acute lymphoblastic leukemia.