- Six histotypes of endometrial carcinoma include 1) endometrioid carcinoma with the highest rate of 81, 3% in which the variants show squamous differentiation (56.3%), villoglandular variant (41, 4%), and secretory variant (2.3%), 2) mucinous carcinoma (6.5%), 3) serous carcinoma (4.7%), 4) serous endometrial intraepithelial carcinoma (3.7%), 5) clear cell carcinoma (2.8%), and 6) mixed adenocarcinoma with lowest rate (0.9%).