Chemokine ligand 20 is a ligand for CCR6. Upregulated in hepatocellular carcinoma. Part of the immune and inflammatory response in the lungs. Lack of expression of CCR6 on Lewis lung cancer decreases metastasis. Important for invasiveness of pancreatic and colon cancers. Expressed in oral SCCA. Here, CCR6 is linked to colonic neoplasm.