TGFB1 and asthma: Together with the reported possitive correlation between the levels of TGFβ1 expression and the number of mast cells in the ASM tissue of an asthmatic population [88], this ASM cell-derived, TGFβ1-mediated mast cell migration may thus be involved in mast cell myositis [115], which is a characteristic phenotypic feature of asthma [116].