Immunohistochemistry followed by cell population, qualitative and quantitative staining intensity evaluation was performed with EGFR, EphA2, PDGFRA and CD44 antibodies on a paraffin‐embedded tumor microarray containing 40 oligodendrogliomas, 29 meningiomas, 23 astrocytomas, 10 gliomatosis cerebri, 4 oligoastrocytomas and 3 control brains. This evidence concerns the gene CD44 and gliomatosis cerebri.