Saruparib, a selective inhibitor of poly-ADP ribose polymerase 1 (PARP1), demonstrated a promising objective response rate and progression-free survival in patients with certain homologous recombination repair (HRR)-deficient breast cancers, according to results from the phase I/II PETRA trial presented at the American Association for Cancer Research (AACR) Annual Meeting 2024.
Saruparib, a PARP1-specific inhibitor, showed promising tumor growth inhibition in preclinical models of breast, ovarian, pancreatic, and prostate cancer harboring HRR deficiency mutations. Because saruparib was less toxic than other PARP inhibitors, it could be given at higher doses.