...73-year-old Asian patient diagnosed with lymph nodes and peritoneal metastases just two months after surgery for primary gallbladder cancer....NGS result of germline BRCA1 mutation, the patient was administered first-line Olaparib and obtained a progression-free survival of about 6 months....first report of germline BRCA1 p. S451Lfs*20 mutation and first-line Olaparib usage in a metastatic gallbladder cancer patient.