Objective: In order to determine the significance of proliferative activity (PA) in endometrial carcinomas, we analysed the expres­sion of cell cycle-related antigens in routinely processed tissue. Materials and Methods: Serial sections of 113 endometrial carcinoma specimens were immunostained with the monoclonal anti­body DNA Topoisomerase II-α (Ki-S1). In addition to Topoisomerase II-α (Ki-S1) staining, histologic type, International Federa­tion of Gynecology and Obstetrics (FIGO) stage, FIGO grade, depth of myometrial invasion, tumor size, lymphovascular space inva­sion, serosal and/or adnexal involvement, lymph node metastasis, age and peritoneal cytology were evaluated as prognostic indicators. The median follow-up time was 23 (range, 1 to 126) months. Results: FIGO stage, FIGO grade, tumor size, lymphovascular space invasion, lymph node metastasis, peritoneal cytology and Topoisomerase II-α (Ki-S1) expression all significantly influenced survival in univariate analyses (≤0.05). In the Cox regression analysis, Topoisomerase II-α (Ki-S1), serosal and/or adnexal involvement, and lymph node metastasis expression were the only varia­bles with independent prognostic impact (≤0.05), whereas FIGO stage, FIGO grade, histologic type FIGO grade, depth of inva­sion, tumor size, lymphovascular space invasion, age and peritoneal cytology had no independent influence (p > 0.05). Topoisome­rase II-α (Ki-S1) staining was significantly elevated in advanced (Stage II, III, IV) as opposed to early (Stage I) carcinomas (≤0.05). Conclusion: The association with established prognosticators for endometrial carcinomas, and the results of uni- and multivariate analysis indicate that the additional evaluation of DNA Topoisomerase II-α (Ki-S1) peptide antibody (PA) is useful for classifying patients into subgroups with low and high risk of relapse which might help to individualize the therapeutic strategy in endometrial carcinomas.