IL17A and colorectal cancer: While Wu and colleagues reported that human γδ T cells are the major cellular source of IL‐17 in colorectal cancer [28], a more recent study demonstrated by using three different flow cytometry gating strategies that the majority of IL‐17‐producing leukocytes in colorectal cancer were CD3+ but not Vδ1+ or Vδ2+ T cells, suggesting they are mostly Th17 cells [29].