PD-L1-armored CD19/CD22 dual-targeted CAR-T cell co-infusion bridging to allogeneic hematopoietic stem cell transplantation achieves 7-year sustained remission in an adult patient with early relapsed, chemorefractory B-cell acute lymphoblastic leukemia: a case report. The gene discussed is CD19; the disease is B-cell acute lymphoblastic leukemia.