PTEN and papillary serous cystadenocarcinoma: PTEN intensity showed marked variation across different histological types, with complete loss of PTEN expression (intensity 0) observed predominantly in endometrial carcinoma (10/15, 66.7%) and all papillary serous carcinoma cases (3/3, 100%), and endometrial hyperplasia with atypia, most cases showed weak to moderate intensity (1+, 2/6 cases).