Observation of event-free survival, engraftment rate, overall survival (OS), and safety data in patients aged ≥16 years with acute lymphoblastic leukemia (ALL) receiving a conditioning regimen including total marrow irradiation (TMI) followed by allogeneic hematopoietic stem cell transplantation. Aim to further enhance transplant outcomes in ALL patients based on the existing basis.

Observation of event-free survival, engraftment rate, overall survival (OS), and safety data in patients aged ≥16 years with acute lymphoblastic leukemia (ALL) receiving a conditioning regimen including total marrow irradiation (TMI) followed by allogeneic hematopoietic stem cell transplantation. Aim to further enhance transplant outcomes in ALL patients based on the existing basis.Exploratory Endpoint: Event-free survival at 1 year post allogeneic hematopoietic stem cell transplantation (EFS).Secondary Exploratory Endpoints: (1) Rate of granulocyte and platelet hematopoietic recovery. (2) Incidence of toxicity related to the conditioning regimen.

Inclusion Criteria:

• Subjects eligible for inclusion in this study must meet all of the following criteria: (1) Definitive diagnosis of acute lymphoblastic leukemia requiring allogeneic hematopoietic stem cell transplantation. (2) Age greater than or equal to 16 years.

Exclusion Criteria:

• Subjects meeting any of the following criteria are not eligible for inclusion in this study: (1) Patients with extramedullary infiltration (excluding central nervous system leukemia). (2) Patients undergoing second transplantation. (3) Patients with concurrent malignancies. (4) Patients with malignancies secondary to a second tumor. (5) Patients assessed by the investigator to have accompanying diseases that are deemed to pose a serious risk to the patient's life or interfere with the patient's completion of this study.

Adult patients（ aged ≥16 years） with acute lymphoblastic leukemia (ALL) paining to receive allogeneic hematopoietic stem cell transplantation.