Expression pattern of non-immune stromal cell signatures and inflammatory chemokine signature. The MCP-counter score of endothelial cells (left column) and fibroblasts (middle column), and the expression value of chemokine signature (right column) were presented across four HNSCC subtypes. The data of TCGA cohort (upper row) and the LHNG cohort (lower row) was shown respectively. Boxplots indicate 5%, 25%, 50%, 75%, and 95%, respectively. Comparisons between subtypes were performed by Student t-test. All p values were corrected by the Bonferroni method. The adjusted value of p < 0.05 was considered significant.