Figure 2 (A) ROC curve of total combining predictor, the surgeons, the numbers of removed lymph node, the range of lymph node dissection, the postoperative infection, and the method of drainage. (B) ROC curve of total combining predictor and combining predictor 1. (C) ROC curve of total combining predictor and combining predictor 2. (D) ROC curve of total combining predictor and combining predictor 3. (E) ROC curve of the prediction factor in the validation group (the reference group alpha is the surgeon G, AUC=0.741, P<0.05, the difference was statistically significant). (F) Calibration chart of the nomogram. (G) Scatter plot of the model calibration degree in modeling group (χ2=4.381, P=0.821). (H) Scatter plot of the model calibration degree in validation group (χ2=12.728, P=0.122).