Figure 4.

(A) preoperative prognostic nomogram model for patients with CRLM. (To use the nomogram model, an individual patient's value is located on each variable axis, and a line is drawn upward to determine the number of points received for each variable value. The sum of these numbers is located on the Total Points axis, and a line is drawn downward to the survival axes to determine the likelihood of 1−, 3− or 5-year overall survival). Gender: 0, male, 1, female; Marriage: 1, married, 2, divorced, 3, single, 9, unknown; Race: 1, white, 2, black, 3, others; Location: 0, colon, 1, rectum; Histology: 1, adenocarcinoma, 2, mucinous adenocarcinoma, 3, signet ring cell carcinoma; Grade: 1, well differentiated, 2, moderately differentiated, 3, poorly differentiated/undifferentiated, 4, undifferentiated; CEA: 0, negative, 1, positive, 9, unknown. CEA, carcinoembryonic antigen. The reference value of CEA: nonsmoker <2.5 ng/ml; smoker <5 ng/ml. (B) The calibration curve for predicting patient survival at 1−, 3−, and 5− years. Nomogram-predicted probability of overall survival is plotted on the x-axis; actual overall survival is plotted on the y-axis [C-index of 0.652 (95%CI 0.642-0.662)].