Background: Although blinatumomab, a bispecific T-cell engager, has exhibited promising clinical outcomes in the treatment of B-precursor acute lymphoblastic leukemia (B-ALL) and B cell non-Hodgkin's lymphoma (B-NHL), it still has some limitations due to CD19-negative relapse and an immunosuppressive phenotype. This evidence concerns the gene CD19 and acute lymphoblastic leukemia.