RNF135 and oligodendroglioma: Furthermore, to measure the expression levels of RNF135 in different pathological grade gliomas and normal brain tissues, we examined the RNF135 expression levels in 154 archived paraffin-embedded samples, including 14 astrocytic tumours, 17 oligodendroglioma, 66 anaplastic astrocytoma and 45 glioblastoma and 12 NB tissues, using the immunohistochemical (IHC) staining assay (Fig. 1C).