BRCA2 and breast cancer: When all 96 TNBC were broken down into different age groups, BRCA1 and BRCA2 mutations were 25% (5/20) in unselected women with TNBC ≤ 35 years old and 33.3% (2/6) in women with a FH and/or BI-BC, TNBC and ≤ 35 years old.