Frequency of CD45RO+ subset in CD4+CD25high regulatory T cells associated with progression of hepatocellular carcinoma

The purpose of this study was to assess the properties of CD4(+)CD25(high/low/negative) T cell subsets and analyze their relation with dendritic cells (DCs) in patients with hepatocellular carcinoma (HCC). In HCC patients, the prevalence of CD45RO(+) cells in CD4(+)CD25(high) T cells was increased and associated with higher frequencies of plasmacytoid DCs. Larger proportions of this T cell subset were detected in the patients with larger tumor burdens. These results suggest that increased frequencies of the CD45RO(+) subset in CD4(+)CD25(high) Tregs in HCC patients may establish the immunosuppressive environment cooperatively with tolerogenic plasmacytoid DCs to promote disease progression of liver cancer. (C) 2011 Published by Elsevier Ireland Ltd.