CNS relapse of B-lymphoblastic lymphoma after allogeneic hematopoietic stem cell transplantation: therapy with donor CD19-specific CAR-T cells

Presently, there is no consensus on the best treatment for relapsed B-cell acute lymphoblastic leukemia/lymphoma after allogeneic hematopoietic stem cell transplantation (allo-HSCT), particularly in patients with extramedullary lesions. There are certain anti-tumor drugs that can be used in case of relapse after allo-HSCT, however, prospective randomized studies directly comparing different chemotherapy and immunotherapy approaches are generally lacking. Retrospective studies exploring therapy for relapsed disease are difficult to compare due to the inhomogeneity of patient populations and the diversity of treatment approaches. In such situations, the treatment choice is influenced by the characteristics of the tumor population, particularly, its immunophenotype, available drugs, and the experience of a healthcare facility and physicians. This clinical case report describes the process of treating a patient with B-lymphoblastic lymphoma and shows the possibility of using donor CD19-specific CAR-T cells as a treatment for isolated CNS relapse after allo-HSCT. The patient's parents gave their consent to the use of their child's data, including photographs, for research purposes and in publications.