MRC1 and astrocytoma (excluding glioblastoma): To characterize the distribution pattern of GAMs in human IDH1R132H‐mutant and ‐non‐mutant astrocytomas WHO grade I–IV, we investigated the expression levels of the following M/M markers: Iba1 (pan‐M/M marker), CD68 (lysosomal/endosomal‐associated membrane glycoprotein; highly expressed by M/M), CD163 (scavenger receptor, proposed M2‐like marker), CD206 (macrophage mannose receptor, proposed M2‐like marker) (Figure 2A).