FASN and neoplasm: ST analyses revealed RNA transcript levels of acetyl‐CoA carboxylase (ACC1, which synthesizes malonyl‐CoA from acetyl‐CoA) and fatty acid synthase (FASN, which catalyzes the endogenous FAs to synthesize long‐chain FAs), to be highly enriched in the tumor region from Case 1, while no significant difference was observed in Case 2 (Fig. 2B,C and Fig. S2B,C).