title: Consensus nomenclature for CD8+T cell phenotypes in cancer.
abstract: Whereas preclinical investigations and clinical studies have established that CD8+T cells can profoundly affect cancer progression, the underlying mechanisms are still elusive. Challenging the prevalent view that the beneficial effect of CD8+T cells in cancer is solely attributable to their cytotoxic activity, several reports have indicated that the ability of CD8+T cells to promote tumor regression is dependent on their cytokine secretion profile and their ability to self-renew. Evidence has also shown that the tumor microenvironment can disarm CD8+T cell immunity, leading to the emergence of dysfunctional CD8+T cells. The existence of different types of CD8+T cells in cancer calls for a more precise definition of the CD8+T cell immune phenotypes in cancer and the abandonment of the generic terms "pro-tumor" and "antitumor." Based on recent studies investigating the functions of CD8+T cells in cancer, we here propose some guidelines to precisely define the functional states of CD8+T cells in cancer.
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keywords: CD8+ T cells; IFNγ; anergy; anticancer immunity; cytotoxicity; effector; exhaustion; senescence; stemness