Two of these eight variants were associated in our breast cancer-specific case-case analysis: rs7872034, a missense variant in SMC2 (OR [95% CI] = 1.16 [1.05, 1.27], p = 0.0025), and rs143745791, a missense variant in NCBP1 (OR [95% CI] = 3.71 [2.08, 6.61], p = 8.37 × 10−6). This evidence concerns the gene SMC2 and breast cancer.