Fig. 6

Risk score of the prognostic signature comprising the three-gene signature for overall survival (OS) in the three groups. a Distribution of patients with different risk scores in the training, testing and combined groups. b OS status of patients with different risk scores in the training, testing and combined groups. c Heatmap of the prognostic signature scores in the training, testing and combined groups. d Kaplan–Meier (K–M) analysis of patients in the high- and low-risk groups in the training, testing and combined groups. e Verification of the prognostic value of the three-gene signature by ROC analysis in the training, testing and combined groups