6Sakaguchi S, Sakaguchi N, Shimizu J, et al. Immunologic tolerance maintained by CD25^+ CD4^+ regulatory T cells: their common role in controlling autoimmunity, tumor immunity, and transplantation tolerance. Immunol Rev, 2001, 182:18-32.
7Wang RF. Immune suppression by tumor-specific CD4^+ regulatory Tcells in cancer. Semin Cancer Biol, 2006, 16:73-79.
8Woo EY, Yeh H, Chu CS, et al. Cutting edge: regulatory T cells from lung cancer patients directly inhibit autologous T cell proliferation. J Immunol, 2002, 168:4272-4276.
9Kawaida H, Kono K, Takahashi A, et al. Distribution of CD4^+ CD25^+ high regulatory T-cells in tumor-draining lymph uodes in patients with gastric cancer. J Surg Res, 2005, 124:151-157.
10Liyanage UK, Moore TT, Joo HG, et al. Prevalence of Regulatory T cells is increased in peripheral blood and tumor mieroenvironment of patients with pancreas or breast adenocarcinoma. J Immunol, 2002, 169:2756-2761.
