Immunotherapy has shifted the treatment paradigm for many malignancies, but not all cancer types have enjoyed a clinically meaningful response from checkpoint blockade. Therefore combination therapies that allow enhancement of the antitumor immune response are needed. Poly(ADP-ribose) polymerase (PARP) inhibitors may stimulate antigen presentation via increased T cell cytotoxic activity. In preclinical models, the combination of PARP inhibition with anti-PD-L1 therapy compared with each agent alone has been shown to significantly increase the therapeutic efficacy. PARP inhibitors when combined with anti-CTLA-4 therapy in
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