IL17A and neoplasm: Mouse γδ T cells can be divided into Vγ1, Vγ4, Vγ5, Vγ6, Vγ7 γδ T cell subgroups according to TCR V gene utilization17, while Vγ4 and Vγ6 γδ T cells have been reported to be the major IL-17A-producing γδ T cells in multiple mouse tumour models18–21.