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Objectives: Assessment of the impact on survival of endometrial carcinoma according to the 2009 FIGO (International Federation of Gynecology and Obstetrics) classification and the new FIGO 2023 classification highlighting the worse prognosis of the aggressive subtypes. Methods: This multicenter retrospective study included 1181 patients with endometrial cancer. Comprehensive clinical, pathological and treatment-related variables were collected. Primary outcomes included overall survival assessed through five-year follow-ups. Statistical analysis included comparative tests, Kaplan-Meier survival estimation, Cox proportional hazards models and ROC curves analysis to review prognostic accuracy. Results: Aggressive endometrial carcinoma (n = 353) showed significant worse overall survival compared with non-aggressive cases (35.7 versus 60 months). A novel classification based on FIGO 2023 was developed, integrating histological aggressiveness into a different stage and combining early non-aggressive stages in only one stage. While FIGO 2009 and 2023 classifications showed prognostic value, the new model improved risk stratification, clearly distinguishing high-risk groups. Multivariate analysis identified aggressive subtype, stage, age, diabetes, myometrial invasion and lymphovascular invasion as independent predictors. Conclusions: Aggressive histological subtype in endometrial cancer should carry greater prognostic weight in terms of survival and clinical management. Our findings support a potential shift in the current paradigm for these relatively rare but high-risk cases.