Fig. 3. Probability of overall survival (OS) according to (A) decile risk scores and (B) the final risk groups in the development cohort. Using decile risk scores, we classified the patients into 10 groups: rank 1 (score ≤0.17), rank 2 (score, >0.17 and ≤0.26), rank 3 (score, >0.26 and ≤0.4), rank 4 (score, >0.4 and ≤0.55), rank 5 (score, >0.55 and ≤0.68), rank 6 (score, >0.68 and ≤0.81), rank 7 (score, >0.81 and ≤0.91), rank 8 (score, >0.91 and ≤1.08), rank 9 (score, >1.08 and ≤1.21), and rank 10 (>1.21). Based on the 5-year OS rates in each rank group, we then stratified the patients into 4 risk groups. The low-risk group included patients with rank 1; the intermediate-risk group included patients with ranks 2 and 3; the high-risk group included patients with rank 4; and the very high-risk group included patients with ranks 5, 6, 7, 8, 9, and 10. The log-rank test showed significant differences in the OS among the risk groups (P<0.001).

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