Based on highly similar founder variant spectra of BRCA1 in Poland and Latvia, we decided to test the frequency of other common variants of moderate breast cancer risk —c.509_510delGA (rs515726124) and c.172_175delTTGT (rs180177143) of the PALB2 gene, and the c.1667_1667+3delAGTA variant of the RECQL gene. Here, BRCA1 is linked to breast cancer.