SLC22A5 and cancer: β-oxidation also plays a key role in cancer cells as these cells are dependent on lipid oxidation for their growth and proliferation [27]; in addition, several types of cancer present a dysregulation in the expression of both CPT1 and SLC22A5/OCTN2, which transports L-carnitine into the cells; therefore, these proteins have been considered a potential target for antineoplastic drugs [28].