De-escalated Conformal Radiation Expedited Sequentially With Chemotherapy for Endometrial Cancer

The goal of this study is to evaluate short course radiation in the post-operative female pelvis after hysterectomy in stage III-IVA endometrial adenocarcinoma patients, or any stage patients with uterine serous or carcinosarcoma histology. The investigators hypothesize that short course pelvic radiation will have an acute and late grade 3-4 toxicity rate \< 10%, and patients will benefit from both convenient and effective loco-regional control comparable to the traditional 5-6 weeks of radiation.