We found statistically significant evidence of association with breast cancer for eight of the 10 breast cancer susceptibility loci examined: FGFR2-rs2981582, TNRC9-rs3803662, 1p-rs11249433, 5p-rs7716600, 2q35-rs13387042, MAP3K1-rs889312, 8q24-rs13281615, and RAD51L1- rs999737. This evidence concerns the gene MAP3K1 and breast cancer.