RBP4 and breast cancer: When the model was further adjusted for potential risk factors of breast cancer, the results were similar, with ORs (95% CIs) of 2.16(1.01–4.61) and 2.07(1.07–4.00) for women in the second and highest RBP4 tertile, respectively, when compared to those in the lowest tertile(P <0.05).