The tumor microenvironment provides favorable conditions for the enrichment of IL‐17‐producing γδ T cells, notably through enhanced levels of the cytokines IL‐1β, IL‐6, IL‐23 and IL‐7, which favor CD27− γδ T‐cell survival and promote IL‐17 expression.34, 88, 92. Here, CD27 is linked to neoplasm.