[14] Nomizu Nomizu T T A case of familial breast cancer with double heterozygosity for BRCA1 and BRCA2 genes A case of familial breast cancer with double heterozygosity for BRCA1 and BRCA2 genes Breast Cancer Breast Cancer 2015 2015 22 22 5 5 557 557 61 61 23242612 23242612. Here, BRCA1 is linked to breast cancer.