Ph+ Acute Lymphoblastic Leukemia (Ph+ALL)

The goal of this clinical trial is to learn if Asciminib, a first in class allosteric inhibitor, as a add-on maintenance therapy can provides benefits and further prevents relapse in post allogenic hematopoietic stem-cell transplant (HSCT) of patients with Philadelphia chromosome-positive B-cell acute lymphoblastic leukemia (Ph+ B-ALL) or blastic transformed Chronic Myeloid Leukemia (CML-BP). The main questions it aims to answer are: Would Ascminib add-on maintenance therapyimprove Morphological relapse-free survival rate? Would Ascminib add-on maintenance therapy improve Molecular relapse-free survival and Overall survival ? Any toxicity or intolerable events during Ascminib add-on maintenance therapy? Researchers will compare Study arm (Ascminib plus tyrosine-kinase inhibitors \[TKIs\]) and Control arm (TKIs only) to see if Ascminib add-on maintenance therapy would provide better relapse-free survival (RFS) with optimal tolerability. Participants will * Enrolled and Randomized into either Study arm or Control arm * Take Ascminib plus selected TKI or selected TKI only according to schedule * Visit the clinic once every 2-4 weeks for checkups and tests * Record and Report any adverse event and graft-versus-host-disease (GvHD) development

This study is a single-center, prospective, single-arm exploratory study. Ph + acute lymphoblastic leukemia patients treated with allogeneic hematopoietic stem cell transplantation were recruited from the Stem Cell Transplantation Center of the Hospital of Hematology, Chinese Academy of Medical Sciences. The number of patients is expected to be 50 cases. The enrolled patients plan to receive Olverembatinib as a post-transplant treatment regimen, including maintenance therapy to prevent recurrence and preemptive treatment. Hematopoietic reconstitution ( neutrophil \> 0.5 × 10 \^ 9 / L, platelet \> 50 × 10 \^ 9 / L ) was evaluated after enrollment. From 2 months to 3 months after transplantation, Olverembatinib 40 mg QOD was added for maintenance treatment until 2 years after transplantation. During maintenance treatment, Olverembatinib dose ( dose range 20 mg QOD to 40 mg QOD ) can be adjusted according to blood picture, biochemical index or other oral drugs ( triazole drugs, etc. ).