CCL20 and melanoma: Furthermore, the administration of probiotic supplements in mice with melanoma has been shown to enhance the population of short-chain fatty acid-producing bacteria in the gut, elevate the levels of short-chain fatty acids (SCFAs) in the bloodstream, and promote the recruitment of helper T cell 17 by upregulating the expression of chemokine (C-C motif) ligand 20 (CCL20) in lung endothelial cells.