Polyunsaturated fatty acids, melatonin, and cancer prevention 1 1Abbreviations: 13-HODE, 13-hydroxyoctadecadienoic acid; NDGA, nordihydroguaiaretic acid; EGF, epidermal growth factor; EPA, eicosapentaenoic acid; DHA, docosahexaenoic acid; 8-Br-cAMP, 8-bromo-cyclic adenosine monophosphate; FATP, fatty acid transport protein; cAMP, cyclic adenosine monophosphate; TGFα, tumor growth factor alpha; MAPK, mitogen-activated protein kinase; and FAT, fatty acid translocase.