Risk stratification based on the nomogram
The risk score was calculated using the nomogram, and patients were categorized into low‐risk and high‐risk groups based on the median value as the cutoff point. The Kaplan–Meier plot (Figure Kaplan–Meier curves for the patients in the low‐ and high‐risk groups based on the risk scores. (A) training cohort; (B) internal validation set; and (C) external validation set.Effect of chemotherapy on the survival in the total population (A), low‐risk group (B), and high‐risk group (C).