Figure 6

The calibration curve to evaluate the 3-year (A) and 5-year (B) survival for second primary malignancy (SPM) patients in training set; The calibration curve to evaluate the 3-year (C) and 5-year (D) survival for SPMs patients in the validation set. Nomogram-predicted overall survival (OS) is plotted on the x-axis; actual OS is plotted on the y-axis. The imaginary line indicates a perfect calibration model in which the predicted probabilities are identical to the actual survival outcomes.