TAC1 and cancer: Neuropeptides such as galanin (GAL), angiotensin II, apelin, adrenomedullin, endothelin-1, bombesin, orexin, substance P, neuropeptide Y, calcitonin gene-related peptide, vasoactive intestinal peptide and neurotensin are involved in cancer [3,4,5,6,7,8,9].