To investigate the intracellular signaling in EC, we determined the level of p‐AMPK in endometrial tissues (NP, n = 10; SH, n = 6; CH, n = 5; CAH, n = 10; and EC, n = 41) and FOXO1 protein localization in 32 cases of EC and 10 NP tissue samples by IHC. Here, FOXO1 is linked to congenital adrenal hyperplasia.