The TIMER database was then employed to examine the association between the expression levels of DDX58, MAVS, C6orf150, TMEM173, IKBKE, TBK1, and IRF3 and the infiltration of six distinct types of immune cells (B cells, CD8+ T cells, CD4+ T cells, macrophages, neutrophils, and dendritic cells) in cholangiocarcinoma. The gene discussed is CD4; the disease is cholangiocarcinoma.