Figure 4. Prognosis and expression of risk genes in the high-risk and low-risk groups of HNSCC patients. (A) Risk plot distribution, survival status, and expression of risk genes of HNSCC patients in the TCGA training set. (B) Risk plot distribution, survival status, and expression of risk genes of HNSCC patients in the TCGA test set. (C) Risk plot distribution, survival status, and expression of risk genes of HNSCC patients in the GEO test set. (D) Risk plot distribution, survival status, and expression of risk genes of HNSCC patients in the TCGA all data set.