In the model described above, it was indicated that serum leptin receptor levels were protective against BC (OR: 0.98, 95% CI: 0.97–0.99, p = 0.02), while the GG genotype of rs1137101 of the LEPR gene increased its risk (OR: 3.20; 95% CI: 1.17–8.73, p = 0.02) (Table 6). Here, LEPR is linked to breast cancer.