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Internal and external validation of the four-gene signature prognostic risk model. (A–D) The Kaplan–Meier survival curve of the OS of patients with high-risk and low-risk scores in TCGA training, GSE14333, GSE103479, and GSE72970 cohorts. (E–H) The ROC curve of the prognostic model in TCGA training, GSE14333, GSE103479, and GSE72970 cohorts.
