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Forest diagrams of univariate (A) and multivariate (B) Cox regression analyses illustrate that the risk score is an independent prognostic factor in lung cancer. The ROC curves of the 1-year, 2-year and 5-year survival rate in the training set (C), validation set (D) and entire set (E). The ROC curves of the risk score, age, sex, stage, T stage, N stage and M stage in the training set (F), validation set (G) and entire set (H). ROC, receiver operating characteristic.
