BRCA1 and breast cancer: Among the 43 breast cancer susceptibility variants that had not previously been evaluated in mutation carriers, we observed six associations with breast cancer at P <0.05 in BRCA1 carriers (5p33.3, 8q24.21, 11q24.3, 12q22, 16q12.1b and 22q13.1) and three in BRCA2 carriers (6p23, 11q24.3 and 16q12.1b).