Ex Vivo T-Cell-Depleted Haploidentical Transplantation Bridging With Chimeric Antigen Receptor T-cell Therapy and Prophylactic Memory T Cell Infusion for Acute Leukemia

Approximately 28 days post-CAR-T therapy, a hematologic assessment will be performed. Eligible patients meeting the inclusion criteria will subsequently undergo TCRαβ+/CD45RA+depleted haploidentical hematopoietic stem cell transplantation (haplo-HSCT).Collect peripheral blood stem cells (PBSC) from the haplo-donor.Split the graft into two fractions at a 9:1 ratio, 90% fraction: subject to TCRαβ+ T-cell depletion, 10% fraction: subject to CD45RA+ T-cell depletion. Primary graft (TCRαβ+depleted and partial CD45RA+ depleted): Freshly infused into the recipient. Residual CD45RA-depleted lymphocytes: Cryopreserved for prophylactic donor lymphocyte infusion (DLI) as needed.