After multivariable analysis, age of diagnosis (OR 0.89, 95% CI: 0.81–0.95, for each year increase), triple-negative subtype (OR 17.2, 95% CI: 3.74–114.72), and number of breast cancers in the family (OR 2.46, 95% CI 1.57–4.03, for each additional case) were associated with BRCA1 pathogenic variants. Here, BRCA1 is linked to breast cancer.