Overall, 309 affected BRCA1/2 and PALB2 carriers with a median age of 43 years at breast cancer diagnosis (range, 19–80 years) were included; 160 (51.8%) BRCA1, 130 (42.1%) BRCA2, and 19 (6.1%) PALB2 carriers. This evidence concerns the gene BRCA2 and breast cancer.