I. To determine if treatment with cisplatin and volume-directed radiation followed by carboplatin and paclitaxel for 4 cycles (experimental arm) reduces the rate of death (i.e., increases survival) when compared to chemotherapy consisting of carboplatin and paclitaxel for 6 cycles (control arm) in patients with stages III-IVA endometrial carcinoma (< 2 cm residual disease) or patients with FIGO 2009 stage I or II serous (UPSC) or clear cell endometrial carcinoma and positive cytology.