GLIPR1 and oligodendroglioma: Related to testes-specific, vespid and pathogenesis protein-1 (RTVP-1), or glioma pathogenesis-related protein 1, is highly expressed in GBM and glioma cell lines, but not in normal adult brain, nor in low grade astrocytomas, oligodendrogliomas or other nervous system tumors (6–9).