IL17A and neoplasm: Consistent with a vital role in assisting tumors of mast cell-derived IL-17A in vivo, compared to mice injected with mast cells plus control IgG or mast cells from WT mice, mice injected with mast cells plus IL-17A neutralizing antibodies or mast cells from IL-17A knockout mice showed decreased tumor volumes, disease progression and tumor cell proliferation (Fig. 6f, g and Supplementary Figure 4g).