Fig. 6

External validation of the risk score model using GEO databese. A The distribution of the risk score in the GSE21501 and GSE57495 merging database. Red dots and green dots represent the high-risk group and low-risk group, respectively. B Survival distribution in the high- or low- risk score group in the GSE21501 and GSE57495 merging database. Red dots and green dots represent deceased and live patients, respectively. C Kaplan–Meier survival curve of the risk score in four GEO databases. D Heatmap of six methylation-driven genes in the high- and low- risk subgroups in the GSE21501 and GSE57495 merging database. E Time-dependent ROC curve of the risk score model in four GEO databases