Interestingly, genetically raised level of MIF was associated with decreased risk of BC (OR: 0.88; 95% CIs: 0.81–0.95; P value: 1.9 × 10−3), especially in ER-negative BC cases (OR: 0.84; 95% CIs: 0.72–0.97; P value: 0.018). This evidence concerns the gene MIF and breast cancer.