The role of natural killer (NK) cells as immune effectors is well established, as is their utility as immunotherapeutic agents against various cancers. However, NK cells' anti-cancer roles are suppressed in cancer patients by various immunomodulatory mechanisms which alter these cells' identity, function, and potential for immunosurveillance. This manifests in abnormal NK cell responses accompanied by changes in phenotypic or genotypic identity, giving rise to specific NK cell subsets that are either hypofunctional or, more broadly, defective in their responses. Anergy, senescence, and exhaustion are some of the terms that have been used to define and characterize these NK cell functional states. These responses vary not only with cancer type but also NK cell location within tissues. Collectively, these phenomena suggest a highly plastic nature of NK cell biology in tumors. In this review, we present and discuss a summary of these functionally distinct states and provide an overview of how NK cells behave at different locations within the context of cancer.
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