Figure 8. External validation of the eight-gene signature model. (A–D) Survival curve of GSE31210 (p = 0.0064), GSE30219 (p = 0.01), GSE13213 (p = 0.057), and GSE50081 (p = 0.014) indicating that a lower risk score was associated with better overall survival outcomes. Red, low–risk group; blue, high–risk group.