The use of multistage immunotherapy to achieve remission before haploidentical hematopoietic stem cell transplantation in patients with acute lymphoblastic leukemia and the treatment of complications of this therapy in the early post-transplant period: a review of the literature and a clinical case

Abstract

Despite improved understanding of the biology of the disease and the use of multicomponent chemotherapy, the prognosis for children with relapsed or refractory B-line acute lymphoblastic leukemia (B-ALL) remains poor. Currently, the only definitive treatment for these patients is allogeneic hematopoietic stem cell transplantation (allo-HSCT), which can be performed after achieving immunohematological remission. Conducting highintensity polychemotherapy (PCT) blocks to achieve negative values of minimal residual disease (MRD) is often limited due to high toxicity. The developed monoclonal antibodies targeting cell surface antigens, such as CD19 and CD20, are actively used in children with relapsed/refractory B-ALL as part of “bridge therapy”, which allows achieving MRD-negative status without the use of intensive chemotherapy. However, new strategies are needed to improve the prognosis of these patients. The drug Inotuzumab ozogamicin has demonstrated efficacy in relapses of B-ALL and is actively used to achieve a negative MRD status before the allo-HSCT stage in children. In the presented article, in addition to a brief review of the literature, clinical experience with the use of this drug is demonstrated.