“…10 Several different approaches have been developed to exploit CD19 on B-cells in patients with R/R DLBCL over the past 5 years, including chimeric antigen receptor T-cell therapy (CAR-T), bispecific antibodies which localize T-cells to CD19, antibody-drug conjugates which deliver a cytotoxic payload to CD19-bearing cells and now tafasitamab in combination with lenalidomide. [11][12][13][14][15] Tafasitamab development, structure, mechanism of action (MOA) and early clinical data Initial attempts to exploit CD19 via murine antihuman CD19 monoclonal antibodies (mAbs), with or without linked toxins, were met with limited success, partly as a result of CD19 internalization following antibody binding and the development of human anti-murine antibodies during treatment. 10,16 The second generation of CD19-targeting antibodies utilized computational algorithms and high-throughput screening to design and select antibodies with specific engineered Fc variant regions to enhance immune effector functions, including antibody-dependent cell-mediated cytotoxicity (ADCC).…”