The proinflammatory profile of MAIT cells, and in particular their frequent bias towards IL17 production, includes this T cell subset in a general peculiarity of the type-17 immune response, that not only plays a pivotal role in the protection against bacteria, fungi, and certain viruses but also contributes to dysfunctional responses in case of infection, autoimmunity, degenerative conditions, and cancer [107,108,109]. Here, IL17A is linked to cancer.