Fig. 4

Time-dependent ROC curves of 1-, 3-, and 5-year survival for patients with small cell lung cancer in the training (A) and validation (B) sets. Time-dependent C-index of 1-, 3-, and 5-year survival for patients with small cell lung cancer in the training (C) and validation (D) sets. AUC and C-index > 0.6 were considered ideal for the discrimination