FASN and hepatocellular carcinoma: Reliable studies have shown that ATP‐citrate lyase (ATP‐citrate lyase, ACLY), acetyl‐CoA carboxylase (Acetyl‐CoA Carboxylase, ACC), fatty acid synthase (Fatty Acid Synthase, FASN), and stearyl‐CoA desaturase (Stearoyl‐CoA Desaturase, SCD) are considered key enzymes involved in lipid metabolism, which are commonly upregulated in HCC and associated with poor prognosis [109].