Endometrialcancer (EC)isone of the most frequentgynecologic cancers, approximately 20%ofpatients are regarded as high-risk with poor prognosis. However, moredetailsof patients with second primary endometrialcancer (SPEC) after colorectal cancer (CRC) remain poorly understood. We therefore proposed to construct twonomogramsto predict 3- and5-year overall survival (OS) and cancer-specific survival (CSS) rates to facilitateclinicalapplication. A total of 1631 participants wereidentified inthe SEER databasefrom1973to2020. We constructed and validated the nomograms for predicting OS and CSS. Thereceiver operating characteristic curves,calibrationplot, decision curve analysis, C-index, net reclassification improvement, and integrated discrimination improvement were applied to evaluatethe predictive performance. Finally, the Prognosticindex was calculated and usedfor riskstratificationof Kaplan-Meiersurvivalanalysis based on different treatmentoptions. Nomograms of OS and CSS were formulated based on theindependentprognosticfactors utilizingthetrainingset. The3- and 5- years of OS nomogram demonstratedgooddiscrimination (AUC = 0.840 and 0.829, respectively), well-calibrated power,and excellentclinicaleffectiveness. Ournomograms of predicting OS and CSS had a concordance index of 0.801 and 0.866 compared with 0.676 and 0.746 for the AJCC staging system,and more importantly,demonstrated a better forecast accuracy. Chemoradiotherapy displayed a significant survival benefit in the high-risk groups, but proceeding to surgery plus chemotherapy showed a favorable survival for the low groups based on all patients. We developed andinternallyvalidated multivariable models that predict OS and CSS risk of SPEC in patients with a CRC to helpclinicians makeapplicable clinical decisions for patients.
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