Background:To investigate the pathogenesis, genetic changes, treatment and prognosis of adult B-cell acute lymphoblastic leukemia (B-ALL) with platelet-derived growth factor receptor B (PDGFRB) fusion. Method:Clinical characteristics, treatment process and prognosis of 7 adult B-ALL patients with PDGFRB fusion were presented respectively, and the PDGFRB fusion was confirmed by fluorescence in situ hybridization, RNA sequencing and Polymerase Chain Reaction. Results: 7 adult B-ALL patients with

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... DGFRB fusion were presented respectively. There were 5 males and 2 females, with a median age of 21 (range, 17-39) years and a median white blood cell count of 7.85 (range, 2.30-111.25) ×10^9/L. The fusion partners were EBF1, SMIM3 and TERF2. Three of 7 cases received tyrosine kinase inhibitor (TKI) targeted therapy, and 4 of 7 cases received chimeric antigen receptor T -cell (CAR-T) therapy. A total of 6 (85.71%) cases underwent haploid hematopoietic stem cell transplantation (Haplo-HSCT). Overall response rate was 71.43% (4/7), and the common adverse reactions during induction were febrile neutropenia and nausea. Seventy-five percent (3/4) and 100% (6/6) of patients were minimal residual disease negative after CAR-T and Haplo-HSCT. To the last follow-up, 2 of 7 cases relapsed in 2 and 7 months after remission, respectively, and the estimated 36 months of Event-free survival and Overall survival was 75.0% and 66.7%.Conclusions: intensive therapy combined with CAR-T or TKI is needed to achieve deep remission, and sequential Haplo-HSCT may improve the prognosis of adult B-ALL with PDGFRB fusion.