Figure 2. (A–C) The restricted cubic spline of the stromal score in training and validation cohorts (DFS). (D–F) Patients with stromal-type B had significantly worse disease-free survival than patients with stromal type A in training and validation cohorts. (G–I) The stromal score had acceptable predictive ability in all three cohorts. DFS, disease-free survival; RR, risk ratio; AUC, area under the receiver operating characteristic curve.