FABP4 and neoplasm: Novel adipocytokines (apelin, endotrophin, Fatty acid binding protein 4 (FABP4), lipocalin 2, omentin-1, visfatin, chemerin, angiopoietin protein 2 (ANGPTL2), and osteopontin) have been identified in various tumor types, enriching the list of potential carcinogenic factors [119].