NCT07105579 2025-08-06Effectiveness and Safety of Blinatumomab and Donor Lymphocyte Infusion in Maintenance Therapy After Allogeneic Hematopoietic Stem Cell Transplantation for High-risk Ph Negative B Cell Acute Lymphoblastic LeukemiaFirst Affiliated Hospital of Zhejiang UniversityPhase 2 Recruiting31 enrolled