We then performed TCGA data analysis using the UALCAN online tool to evaluate the expression of monocyte/macrophage marker genes, including MRC1 (CD206), SCARI1(CD163), SCARD1 (CD68), ITGAM (CD11b), in HNSCC (n = 520) and adjacent normal (n = 44) tissues. Here, CD68 is linked to head and neck squamous cell carcinoma.