Leukemia, Lymphoid

This clinical trial is an open-label, multicenter, prospective phase 2 clinical trial targeting pediatric leukemia patients of infant age. The goal is to improve survival rates by varying the presence or absence of chemotherapy and hematopoietic stem cell transplantation based on genetic characteristics at the time of diagnosis and minimal residual disease (MRD) values measured by various methods after treatment. In addition, by clearly defining the patient group that requires hematopoietic stem cell transplantation, it is expected that the role of hematopoietic stem cell transplantation in infantile leukemia, for which there have been various guidelines for hematopoietic stem cell transplantation, can be confirmed. Additionally, due to the characteristics of infants, this study aim to identify long-term sequelae or prognosis related to treatment by prospectively collecting side effect data related to treatment during and after treatment.

The goal of this single-arm, prospective study is to test in low-burden B-cell lymphoblastic leukemia (B-ALL) patients undergoing allogeneic hemopoietic stem-cell transplantation (allo-HSCT). The main question it aims to answer is: • The efficacy and safety of short-term blinatumomab as a bridging therapy to allo-HSCT in patients with low-burden B-ALL. Participants will take intravenous blinatumomab prior to allo-HSCT with an initial dosage of 8 μg/day. The dosage gradually escalated to 28 μg/day and continued for 5 to 10 days. Dexamethasone 20mg was administered 1 hour before the onset of blinatumomab infusion.

The goal of this phase I/II clinical trial is to test in relapsed or refractory acute lymphoblastic leukemia (R/R ALL) patients undergoing allogeneic hemopoietic stem-cell transplantation (allo-HSCT). The main question it aims to answer is: • The efficacy and safety of blinatumomab maintenance therapy in reducing the recurrence rate a in R/R ALL patients after allo-HSCT. Participants will take intravenous blinatumomab after allo-HSCT. The dose of one course was as follows: day 1-2: 8ug/day, continuous intravenous drip for 24 hours, day 3-7: 16ug/day, continuous intravenous drip for 24 hours. Treatment with blinatumomab was initiated within 60 to 90 days after transplantation and was administered bimonthly until 1 year after transplantation. Dexamethasone 20mg was administered 1 hour before administration on days 1 and 3 to prevent adverse events.