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To establish an effective and accurate prognostic nomogram for lung adenocarcinoma (LUAD). Patients and Methods. 62,355 LUAD patients from 1975 to 2016 enrolled in the Surveillance, Epidemiology, and End Results (SEER) database were randomly and equally divided into the training cohort (n\u2009=\u200931,179) and the validation cohort (n\u2009=\u200931,176). Univariate and multivariate Cox regression analyses screened the predictive effects of each variable on survival. The concordance index (C-index), calibration curves, receiver operating characteristic (ROC) curve, and area under the ROC curve (AUC) were used to examine and validate the predictive accuracy of the nomogram. Kaplan\u2013Meier curves were used to estimate overall survival (OS). Results. 10 prognostic factors associated with OS were identified, including age, sex, race, marital status, American Joint Committee on Cancer (AJCC) TNM stage, tumor size, grade, and primary site. A nomogram was established based on these results. C-indexes of the nomogram model reached 0.777 (95% confidence interval (CI), 0.773 to 0.781) and 0.779 (95% CI, 0.775 to 0.783) in the training and validation cohorts, respectively. The calibration curves were well-fitted for both cohorts. The AUC for the 3- and 5-year OS presented great prognostic accuracy in the training cohort (AUC\u2009=\u20090.832 and 0.827, respectively) and validation cohort (AUC\u2009=\u20090.835 and 0.828, respectively). The Kaplan\u2013Meier curves presented significant differences in OS among the groups. Conclusion. The nomogram allows accurate and comprehensive prognostic prediction for patients with LUAD.<\/jats:p>","DOI":"10.1155\/2022\/5698582","type":"journal-article","created":{"date-parts":[[2022,12,10]],"date-time":"2022-12-10T20:50:05Z","timestamp":1670705405000},"page":"1-13","source":"Crossref","is-referenced-by-count":7,"title":["Development and Validation of a Prognostic Nomogram for Lung Adenocarcinoma: A Population-Based Study"],"prefix":"10.1155","volume":"2022","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-3685-2873","authenticated-orcid":true,"given":"Bin","family":"Xie","sequence":"first","affiliation":[{"name":"National Clinical Research Center for Geriatric Disorders, Xiangya Hospital, Central South University, Changsha 410008, China"},{"name":"Department of Geriatrics,Respiratory Medicine, Xiangya Hospital, Central South University, Changsha 410008, 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