In the breast cancer samples, the expression level of RBP7 in tumor cells was ranked as weak, moderate, and strong, which was scored by the staining intensity in the pathological IHC (Figures 3(e)–3(g)).Interestingly, as a nuclear receptor, RBP7 was found to be mainly localized in the nucleus, indicating the important role of RBP7 in the regulation of gene expression in epithelial cells of breast cancer tissues. Here, RBP7 is linked to breast cancer.