Unlocking the Complexities of Tumor-Associated Regulatory T Cells

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  • Jaime L. Chao
    Department of Pathology, University of Chicago, Chicago, IL 60637
  • Peter A. Savage
    Department of Pathology, University of Chicago, Chicago, IL 60637

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<jats:title>Abstract</jats:title> <jats:p>Regulatory T (Treg) cells are found at elevated densities in many human cancers and are thought to be a major barrier to the generation of robust antitumor T cell responses. In this review, we discuss recent advances in the understanding of tumor-associated Treg cell diversity and function. Emerging evidence indicates that the transcriptional program of Treg cells infiltrating human cancers may represent a composite program blending a tissue-associated expression signature with an additional tumor-specific signature common to Treg cells from multiple cancer types. Studies in mouse models have defined unique molecular pathways required for Treg cell function in the tumor context that can be manipulated to selectively dampen intratumoral Treg cell activity. Finally, an expanding body of work has revealed diverse functions for Treg cells in nonlymphoid tissues that are unrelated to immune suppression, suggesting a need to explore functions of intratumoral Treg cells beyond the regulation of antitumor immunity.</jats:p>

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