Findings from the phase I/IIa trial of AZD5305, a next-generation, highly selective PARP1 inhibitor, indicate that the drug is better tolerated in patients with ovarian, HER2-negative breast, pancreatic, and prostate cancers with BRCA1/2, PALB2, and RAD51C mutations compared with first-generation PARP inhibitors. In addition, 25% of 40 evaluable patients had a partial response.

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