MRC1 and pilocytic astrocytoma: Statistical analysis of Iba1‐, CD68‐, CD163‐ and CD206‐positive GAMs in pilocytic astrocytomas and IDH1R132H‐mutant and ‐non‐mutant diffuse astrocytomas of WHO grade II–IV revealed highest numbers for the Iba1‐positive GAM fraction in all astrocytomas followed by the presumed pan‐M/M marker CD68 and CD163 being expressed by a slightly lower proportion of GAMs (Figure 2B, Figure S3A–D, Table 1).