Fig. 2: Nomogram and performance evaluation.

a Newly developed TSP-based nomogram. b ROC curve of the nomogram in the training cohort. c Calibration curve of the nomogram in the training cohort. d ROC curve of the nomogram in the validation cohort. e Calibration curve of the nomogram in the validation cohort. In the calibration curve, the y axis represents the actual LN metastasis rate, and the x axis represents the nomogram-predicted LN metastasis probability. The diagonal grey line represents a perfect prediction using an ideal model. The blue line represents the performance of the nomogram. The orange line represents the bias-corrected performance of the nomogram.