CD4 and liver cancer: In this study, the proportion of peripheral blood CD4+CD25+CD127lowTregs accounted for CD4+ T lymphocytes in patients with primary liver cancer (6.21 ± 1.53% for ≤ 49 years and 6.69 ± 1.53% for ≥ 50 years) and healthy control groups (3.30 ± 1.45% for ≤ 49 years and 4.69 ± 1.27% for ≥ 50 years) (P <0.05).