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Validation of the risk score prognostic model among the different clinical groups. (A) Age ≤65; (B) age >65; (C) T1-2; (D) T3-4; (E) N0; (F) N1–3; (G) stage I–II; (H) stage III–IV. The blue lines represent the low-risk groups, the red lines represent the high-risk groups.
