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Evaluation of calibration plots based on OS of the training group (A–D) and the validation group (E–H) in 1, 2, 3, and 5 years. The slanted gray line represents an ideal match between the actual survival (y-axis) and nomogram-predicted survival (x-axis). The perpendicular line means 95% CIs. Closer distances from the points to the dashed line indicate higher prediction accuracy. OS, overall survival.
