IL-17 and IL-22 production from NKT17 cells [316], [317] and IL-17 production from MAIT cells [318] have also been shown to contribute to tumour growth and metastasis, with a recent single cell analysis of tumour-infiltrating T cells across 21 cancer types showing that 50% of intratumoural Tc17 cells were MAIT cells [319]. The gene discussed is IL17A; the disease is cancer.