Prognostic prediction model of colorectal cancer based on preoperative serum tumor markers

Figure 1 Nomogram for predicting the prognosis of patients with non-metastatic colorectal cancer. CEA: Carcinoembryonic antigen; CA199: Carbohydrate antigen 19-9.

Figure 2 Receiver operating characteristic curves of the nomogram. A: 1-,3- and 5-year receiver operating characteristic (ROC) of nomogram using train set; B: 1-,3- and 5-year ROC of nomogram using validation set. AUC: Area under the curve.

Figure 3 Calibration curves for the nomogram. A: 1-,3- and 5-year calibration curves of overall survival (OS) using training set; B: 1-,3- and 5-year calibration curves of OS using validation set. OS: Overall survival.

Figure 4 Decision curve analysis for the nomograms. A: Decision curve analysis (DCA) of 1-year survival nomogram using training set; B: DCA of 3-year survival nomogram using training set; C: DCA of 3-year survival nomogram using training set; D: DCA of 1-year survival nomogram using validation set; E: DCA of 3-year survival nomogram using validation set; F: DCA of 5-year survival nomogram using validation set.