Fig. 5

The validation of the accuracy of the Prognostic Risk Model. A, B Univariate/multivariate Cox analysis of risk score and clinical factors. C Time-dependent ROC curve AUC for survival prediction using risk score. D Comparison of AUC of ROC curves for prognostic accuracy between risk score and the clinical characteristics. E C-index curve comparison of prognostic accuracy between risk score and clinical factors. F The establishment of nomogram for determining the survival of OSCC individuals. G Calibration curves corresponding to column line plots were adopted to determine the concordance between 1-, 3-, and 5-year OS. H Kaplan–Meier curves displaying the progression-free survival. PCA between low- and high-risk populations (I) All gene set. J Cuproptosis gene set. K CR LncRNAs set. L 8-CRL prognostic model set. ROC Subject working characteristic curve, PCA Principal component analysis, AUC Area under the curve