Protein expression in preoperative samples: Hormone receptors, Stathmin and PTEN in 44 patients classified as complex atypical hyperplasia (CAH) in preoperative biopsies with endometrioid endometrial carcinoma (EEC)* after hysterectomy (CAH/EEC); and 72 patients with concordant pre and postoperative diagnosis of complex atypical hyperplasia (CAH/CAH). Here, PTEN is linked to endometrial endometrioid carcinoma.