FASN and neoplasm: FASN is the key metabolic enzyme of de novo lipogenesis that has been considered a therapeutic target in various cancer types.37 C75 is an inhibitor of FASN, and acts as a stimulator of carnitine palmitoyltransferase-1 to induce FA oxidation.38 To test whether C75 promotes the antitumor activity of CYH33, CYH33 and C75 alone or in combination were administered to 4T1 tumor-bearing Balb/c mice.