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Simple Summary: Uterine carcinosarcoma is a rare disease that represents less than 5% of uterine malignancies, although approximately 16% of the uterine cancer-related deaths are caused by this disease. Nowadays, there seems to be a lack of prognostic stratifying studies that could lead to tailor the management of uterine carcinosarcoma. The aim of our study was to assess the impact of possible different prognostic factors on the survival of patients diagnosed with uterine carcinosarcoma. We observed that incomplete cytoreduction, presence of tumor residual after treatment, advanced FIGO stage, extrauterine disease, and tumor size were significant prognostic factors decreasing disease-free survival and overall survival. Background: The aim of this study was to assess the impact of prognostic factors on the survival of patients diagnosed with uterine carcinosarcoma. Methods: A sub-analysis of the SARCUT study, a multicentric retrospective European study, was carried out. We selected 283 cases of diagnosed uterine carcinosarcoma for the present study. Prognosis factors influencing survival were analyzed. Results: Significant prognostic factors for overall survival were: incomplete cytoreduction (HR = 4.02; 95%CI = 2.68–6.18), FIGO stages III and IV (HR = 3.21; 95%CI = 1.83–5.61), tumor persistence after any treatment (HR = 2.90; 95%CI = 1.97–4.27), presence of extrauterine disease (HR = 2.62; 95%CI = 1.75–3.92), a positive resection margin (HR = 1.56; 95%CI = 1.05–2.34), age (HR = 1.02; 95%CI = 1.00–1.05), and tumor size (HR = 1.01; 95%CI = 1.00–1.01). Significant prognostic factors for disease-free survival were: incomplete cytoreduction (HR = 3.00; 95%CI = 1.67–5.37), tumor persistence after any treatment (HR = 2.64; 95%CI = 1.81–3.86), FIGO stages III and IV (HR = 2.33; 95%CI = 1.59–3.41), presence of extrauterine disease (HR = 2.13; 95%CI = 1.44–3.17), administration of adjuvant chemotherapy (HR = 1.84; 95%CI = 1.27–2.67), a positive resection margin (HR = 1.65; 95%CI = 1.11–2.44), presence of LVSI (HR = 1.61; 95%CI = 1.02–2.55), and tumor size (HR = 1.00; 95%CI = 1.00–1.01). Conclusions: Incomplete cytoreduction, presence of tumor residual after treatment, advanced FIGO stage, extrauterine disease, and tumor size are significant prognostic factors decreasing disease-free survival and overall survival of patients with uterine carcinosarcoma. [ABSTRACT FROM AUTHOR]