HACD2 and hepatocellular carcinoma: Fatty acid degradation-related genes included ALDH3A2, ADH5, ADH1B, and ALDH1B1 and fatty acid metabolism-related genes HACD2, FASN, HSD17B8, and HACD3. These genes were relatively high in HCC samples with high PDZK1 expression (Figures 4(c) and 4(d)).