This assignment delves into the impact of BRCA mutations on cancer prognosis, specifically focusing on breast cancer. It provides a systematic review and meta-analysis of studies examining the relationship between BRCA mutations and metastatic relapse, as well as cause-specific survival after radical treatment for localized prostate cancer. Additionally, it discusses the role of BRCA mutations in ovarian cancer diagnosis, monitoring treatment, and detecting recurrent disease. The assignment also explores the impact of oophorectomy on cancer incidence and mortality in women with a BRCA1 or BRCA2 mutation.