Exploratory Study of CD22/CD19 Dual-Target CAR-T Cell Therapy as Consolidation Treatment After First Remission in High-Risk B-Cell Acute Lymphoblastic Leukemia

This single-center, open-label, single-arm, prospective study will evaluate the safety, tolerability, and efficacy of CD22/CD19 dual-target chimeric antigen receptor T-cell (CAR-T) therapy as consolidation treatment in patients with high-risk B-cell acute lymphoblastic leukemia (B-ALL) who have achieved first remission after standard induction therapy and consolidation chemotherapy. Approximately 30 patients will be enrolled. Participants will undergo screening, cell collection for CAR-T manufacturing, lymphodepleting chemotherapy, and subsequent CAR-T cell infusion, followed by scheduled safety and efficacy follow-up. Safety assessments will include monitoring for cytokine release syndrome (CRS), neurotoxicity, hematologic toxicity, organ toxicity, infections, and other adverse events. Efficacy assessments will include event-free survival (EFS), overall survival (OS), progression-free survival (PFS), duration of response(DOR), relapse, and mortality. Exploratory analyses will assess CAR-T cell kinetic characteristics and clonal evolution after treatment.