ESR1 and endometrium neoplasm: The present study examined the short-term effects of MET on tissue proliferation, apoptosis, and expression of estrogen receptor-α (ERα), progesterone receptor (PGR), specificity protein (Sp)–related transcription factor Krüppel-like factor 9 (KLF9) and tumor suppressor phosphatase and tensin homolog (PTEN) in endometrial tumors of non-diabetic obese women with EC.