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Despite the success of the CD19xCD3 T cell engager blinatumomab in B-cell acute lymphoblastic leukemia (B-ALL), treatment failure is common and can manifest with antigen loss and extramedullary disease (EMD) relapse. To understand the impact of leukemia genetics on outcomes, we reviewed 267 adult patients with B-ALL treated with blinatumomab and used next generation sequencing to identify molecular alterations. Patients received blinatumomab for relapsed/refractory (R/R) disease (n=150), minimal residual disease (MRD+) (n=88), upfront as induction (n=10), or as consolidation in MRD- state (n=19).

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Comparison of blinatumomab and chimeric antigen receptor T cells pre-haploidentical hematopoietic stem cell transplantation for pediatric Philadelphia chromosome negative B-cell acute lymphoblastic leukemia.

Chin Med J (Engl)

January 2025

Peking University People's Hospital, Peking University Institute of Hematology, National Clinical Research Center for Hematologic Disease, Beijing Key Laboratory of Hematopoietic Stem Cell Transplantation, Peking-Tsinghua Center for Life Science, Research Unit of Key Technique for Diagnosis and Treatment of Hematologic Malignancies, Chinese Academic of Medical Sciences, Beijing 100044, China.

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The treatment of Philadelphia chromosome-positive B-cell acute lymphoblastic leukemia (Ph+ B-cell ALL) has seen substantial progress over the past two decades. The introduction of tyrosine kinase inhibitor (TKIs) has resulted in dramatic improvements in long-term survival. Allogeneic hematopoietic stem cell transplantation (allo-HSCT), with its curative potential, has always been an integral part of the treatment algorithm of Ph+ ALL.

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Using immunotherapeutic agents like inotuzumab ozogamicin (InO), blinatumomab, or chimeric antigen receptor T (CAR T)-cell therapy in frontline adult B-cell acute lymphoblastic leukemia (B-ALL) therapy is promising. These agents are mostly well tolerated and have different toxicity profiles than conventional chemotherapy, enabling their combination with chemotherapy. Additionally, they have often been shown to overcome the traditional adverse ALL risk features.

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Allogeneic hematopoietic stem cell transplantation (Allo-HSCT) remains the mainstay of treatment for adults with high-risk acute lymphoblastic leukemia (ALL). Due to the crucial role of measurable residual disease (MRD) before Allo-HSCT in predicting relapse and the promising anti-leukemia effect of blinatumomab, we documented a short-course, low-dose conditioning regimen incorporating blinatumomab for Allo-HSCT in three ALL patients with positive MRD. Following the administration of the blinatumomab-containing conditioning regimen, all patients attained complete remission (CR) with negative MRD status, and no severe adverse events were observed.

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