IL17A and cancer: The functions of IL-17 in vivo are not only limited to inflammation, but are also closely associated with both physiological and pathological processes.1–3 Various studies have analyzed the molecular mechanisms and pathways underlying IL-17 signaling, providing a theoretical basis for the role of IL-17 in establishing and assisting host defense systems, and inducing tissue regeneration under physiological conditions.4 In addition, it can induce autoimmune responses and promote the onset and development of cancer under pathological conditions.5,6