TLR4 expression was elevated in myeloid dendritic type 1 and type 2 in lung adenocarcinoma (Fig. 2A), as well as in EREG+DC, IGSF21+DC, and myeloid dendritic type 1 and type 2 in lung squamous cell carcinoma tissues (Fig. 2B), compared to normal tissues. This evidence concerns the gene TLR4 and lung adenocarcinoma.