The gene expressions of AOC1 (P < 0.001, Figure 2E), FDX1 (P = 0.003, Figure 2H), MT-CO1 (P < 0.001, Figure 2M), and ACO1 (P < 0.001, Figure 2N) in HCC tumor tissues were remarkably lower than those in normal tissues. Here, MT-CO1 is linked to hepatocellular carcinoma.