MAP2K1 and neoplasm: Figure 6e,f shows that anti‐IFNγ but not control IgG increased the growth of 9609‐MEK1‐hi (p < 0.01) but not 9609 MEK1‐low tumours, suggesting that EV‐MEK1 uptaken by macrophages induced the recruitment of IFNγ‐producing lymphocytes via induction of chemokines, resulting in the in vivo exposure of TD macrophages to functional IFNγ.