As expected, the highest BC risks were conferred by TP53, BRCA1, and BRCA2 (TP53 OR 14, 95% CI 4.1–95; BRCA1 OR 13.4, 95% CI 9.2–20.3; BRCA2 OR 8.8, 95% CI 6.1–12.9, respectively). This evidence concerns the gene BRCA1 and breast cancer.