Prognostic analysis of three-gene model in the training group. The samples were divided into high- and low-risk subgroup according to the median of risk score. (A) The curve of risk score. (B) Survival status of patients. (C) Expression heatmap of three prognostic genes. (D) Survival curve for high- and low-risk subgroup. (E) ROC analysis of three-gene model. ROC, receiver operating characteristic.