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Sequencing of anti-CD19 therapies in the management of diffuse large B-cell lymphoma.
Clinical Cancer Research 2024 April 26
Several second- and third-line immunotherapeutic options for patients with relapsed or refractory diffuse large B-cell lymphoma (DLBCL) ineligible for autologous stem cell transplant are directed against the B-cell antigen CD19. The anti-CD19 monoclonal antibody tafasitamab, paired with the immunomodulator lenalidomide, mediates antibody-dependent cellular toxicity and cellular phagocytosis; the antibody-drug conjugate loncastuximab tesirine delivers the DNA-cross-linking agent tesirine via CD19 binding and internalization; and CD19-directed chimeric antigen receptor T-cell therapy (CAR-T) products are engineered from autologous T cells. While CD19 expression is assessed at diagnosis, clinically relevant thresholds of CD19 expression-which may not be detectable with current routine methodologies-have not been defined and may vary between CD19-directed treatment modalities. Determining optimal treatment sequencing strategies with CD19-directed therapy has been hampered by the exclusion of patients with prior CD19-directed therapies from major clinical trials. Antigen escape, attributed to mechanisms including epitope loss and defective cell-surface trafficking of CD19, is an important cause of CAR-T failure. Limited data suggest that CD19 expression may be maintained after non-CAR-T CD19-directed therapy and retrospective analyses indicate that some patients with disease that relapses after CAR-T may benefit from subsequent CD19-directed therapy. To date, clinical evidence on the effect of anti-CD19 therapy prior to CAR-T is restricted to small case series. Prospective studies and detailed analyses to understand how pre- and post-treatment CD19 expression correlates with clinical responses to subsequent CD19-directed therapy are needed to fully maximize treatment strategies.
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