Platinum-based chemotherapy maintenance regimens are often limited by toxicities, highlighting a need for chemotherapy-free strategies that retain efficacy. Previous studies have demonstrated the success of PARP inhibitors (PARPi) in maintenance therapy, even in patients negative for germline BRCA mutations. Additional work illustrating a PARPi-mediated upregulation of immune checkpoint molecules and enhanced immune response suggests a potential for synergism between PARPi and immune checkpoint inhibitors (ICI). In the phase II DORA study, Tan and colleagues investigate the use of the PARPi olaparib with or without the PD-L1-targeted ICI durvalumab in patients with advanced triple negative breast cancer previously treated with platinum-based chemotherapy. Treatments were tolerable, and the authors report a median progression-free survival of 4.0 months with olaparib and 6.1 months with olaparib plus durvalumab, both significantly longer than previously observed outcomes. Germline BRCA mutation or PD-L1 status had no observable effect on clinical benefit, yet patients who had achieved partial...

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