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Abstract 


Effective immunotherapy promotes the killing of cancer cells by cytotoxic T cells. This requires not only that cancer-specific T cells be generated, but also that these T cells physically contact cancer cells. The coexistence in some patients of cancer cells and T cells that recognize them indicates that tumors may exhibit the phenomenon of immune privilege, in which immunogenic tissue is protected from immune attack. Here, we review the evidence that stromal cells of the tumor microenvironment mediate this restriction by excluding T cells from the vicinity of cancer cells. Overcoming this T cell checkpoint may thus enable optimal immunotherapy.

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Funding 


Funders who supported this work.

American Cancer Society

    Breast Cancer Research Foundation

      Cancer Research UK (1)

      Center for Metastasis Research at MSKCC

        Cycle for Survival

          National Cancer Institute

            New York State Health Research Science Board