<qa>  What type of cancer is excluded from the synchronous primary endometrial cancer?5. Participants with synchronous primary endometrial cancer, or a past history of primary endometrial cancer, are excluded, unless all of the following conditions are met: Stage not greater than I-B; Less than 3 mm invasion without vascular or lymphatic invasion; No poorly differentiated subtypes, including papillary serous, clear cell, or other FIGO Grade 3 lesions. 