Abstract
Regulatory T cell (Treg) infiltration is an important mechanism for inhibition of tumor immune microenvironment. Treg is highly expressed in peripheral blood and tumor tissue of various cancer patients. A high expression of Treg may inhibit the antitumor effect of CD4 + CD8 + T lymphocytes or induce immunological resistance to tumor antigens among cytotoxic T lymphocytes(CTL) without producing acute or memory CTL responses, resulting in tumor escape from immuneattack and immune suppressionin in the tumor microenvironment. Key words: Liver neoplasms; Antigens,differentiation,T-lymphocyte; Neoplasms microenvironment; T-lymphocytes regulatory
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