Bioinformatics analysis of multi-omics data from the LinkedOmicsKB database [73] revealed that both PKCθ mRNA (Figure 6A) and protein (Figure 6B) levels are reduced in lung squamous cell carcinoma, head and neck squamous cell carcinoma, lung adenocarcinoma, clear cell renal cell carcinoma, and pancreatic ductal adenocarcinoma compared with matched normal tissue. This evidence concerns the gene PRRT2 and head and neck squamous cell carcinoma.