Olaparib, a poly adenosine diphosphate-ribose polymerase (PARP) inhibitor, approved for the treatment of metastatic germline <i>BRCA1</i>/<i>BRCA2</i> breast cancer (BC), has demonstrated evidence of a progression-free survival (PFS) benefit, good safety profile, and improved quality of life compared with standard chemotherapy. Here, BRCA1 is linked to breast cancer.