First we confirmed the M1‐ and M2‐like phenotypes of the GM‐CSF and M‐CSF/IL‐4‐generated macrophage populations, respectively 26, 34, whereby the M‐CSF/IL‐4 BMMs are representative of TAMs as IL‐4 is often found in the tumor microenvironment 36, 37. Here, CSF1 is linked to neoplasm.