Percentage methylation of MT1M and MT1G in hepatocellular carcinoma, chronic hepatitis B and normal controls groups. A: Percentage methylation of MT1M was 48.8% (59/121) in the HCC, 5.4% (2/37) in the CHB, and 6.5% (2/31) in the NC groups; B: Percentage methylation of MT1G was 70.2% (85/121) in the HCC, 16.2% (6/37) in the CHB, and 12.9% (4/31) in the NC groups (bP < 0.001).