MRC1 and neoplasm: Specifically, we saw that anti‐tumour macrophages were increased by 35% (p < 0.05) and pro‐tumour (MHC class II low CD206 hi “M2‐type”) macrophages were decreased by 55% (p < 0.05) in MEK1‐hi compared to MEK1‐low tumours, manifesting in a 247% increase in the ratio of these macrophages (p < 0.05).