We surveyed variants in potential hereditary loci including those in TP53 (causative gene for Li–Fraumeni syndrome), BRCA2 (causative gene for hereditary breast/ovarian cancer), and mismatch repair genes (MSH2, MSH6, PMS2, and EPCAM, i.e., causative genes for Lynch syndrome), but found only common SNPs. Here, MSH6 is linked to Hereditary breast and ovarian cancer syndrome.