- Patients with other active invasive malignancies are excluded; patients with prior malignancies (except non-melanoma skin cancer or prior in situ carcinoma of the cervix, patients with synchronous or past history of primary endometrial cancer meeting all conditions of a) stage not greater than IB, b) no more than superficial myometrial invasion, c) without vascular or lymphatic invasion, and d) no poorly differentiated subtypes including papillary serous, clear cell or other FIGO grade 3 lesions; patients with other invasive malignancies who had (or have) cancer present within the last five years are excluded; patients are excluded if they have received prior low abdominal or pelvic radiotherapy for any reason that would contribute radiation dose that would exceed tolerance of normal tissues