Purpose: To investigate treatment outcomes of uterine carcinosarcoma (CS) patients who underwent complete surgical resection of all visible disease and platinum-based adjuvant chemotherapy (multimodal therapy). Materials and Methods: The authors reviewed 127 uterine CS patients treated at this institution from 1990 to 2010. They operated 123 patients in clinical Stages 1-3, 97 of which underwent complete resection and systemic lymphadenectomy. Results: A total of 97 patients (FIGO 2008: Stage 1 in 50 patients, Stage 2 in six, Stage 3 in 37, and Stage 4 in four) underwent surgical staging, 74 of which were administered five cycles (median) of platinumbased adjuvant chemotherapy. The median overall survival (OS) associated with multimodal therapy 50.6 months compared with 34.9 months incomplete multimodal therapy. After multimodal treatment, 32.9% (32/97) patients showed recurrence (24/32 hematogenous). Conclusion: Multimodal therapy increased survival among uterine CS patients, but the recurrence rate remained high. Further consideration of treatment options for uterine CS is required.