Abstract：Regulatory T cell (Treg) is a group of lymphocytes with negetive regulation of inhibiting tumor-associated antigen T cell-mediated immune responses, targeted agents may influence tumor immunotherapy and vaccine activation. Systemic removal of CD25+CD4+ T cells perhaps elicit tumor growth in rodents, but also increasing the severity of the autoimmune diseases as peripheral self-tolerance is maintained by Treg cells. According to sources of Regulatory T cells, it can be classfied as two population of nTreg and iTreg cells. Regulatory T cells are phenotypically diversity and functionally heterogeneous in different types of tumor and tissues, whereas conferring the same marker of CD4, CD25 and foxp3. Because of its tumor heterogeneity and organ heterogeneity, therefore, the strategy of targeting Treg cells in tumor immunotherapy is different. On the other hand, removal Treg cell strategies is different in tumor immunotherapy, it can remove regulatory T cells (Treg) or dampen the function of Treg cells through limit its immunosuppression protein, such as GITR, T-bet, Neoropilin-1, CTLA-4, IDO or PD-1. The autoimmunities can be prevented by inoculating OVA vaccine when removing Tregs .Ipilimumab, which has recently been FDA-approved for therapy patients with advanced melanoma mechnism is targeting CTLA- 4 in Treg cells. In this paper, we review the phenotype, heterogeneity and tumor therapy strategies of Treg treatment in order to avoid immune disorders in the future.
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