Used in the treatment of ovarian cancer, particularly in patients with BRCA gene mutations. It is also approved for maintenance therapy in recurrent epithelial ovarian, fallopian tube, or primary peritoneal cancer. Works by inhibiting PARP enzymes, which helps prevent cancer cells from repairing their DNA, leading to cell death. Employed in advanced stages of cancer when other treatments have failed. Commonly used in combination with other chemotherapeutic agents or as a standalone oral therapy.