CXCL9 and pachyonychia congenita: The mRNA and protein expression profiles of these seven genes using the expression data from TCGA-PC and GEO (GSE28735 and GSE62452) cohorts and the HPA database revealed that PLAU, CXCL10, CXCL9, MET, and IL1RN were overexpressed, whereas PAH and PKD1 were downregulated in PC tissues.