H-score analysis revealed that MIG-6 protein expression in the endometrial epithelial cells from women with CAH (119.44 ± 15.04) and EEC (138.87 ± 10.20) was significantly lower compared to women without endometrial cancer (controls, 243.18 ± 14.62, p < 0.001). Here, ERRFI1 is linked to endometrial cancer.