<prompt> Most common histological subtype of cancer endometrium is :Mucinous carcinomaClear cell carcinomaSquamous cell carcinomaEndometrioid adenocarcinoma  <response>: Histologically most of the endometrial cancers are Adenocarcinomas Hence they are called endometriod adenocarcinoma About 10-15 are Papillary serous Clear cell Adenosquamous Pure squamous Ref : Shaw Gynecology 17e pg 434. 