SOX2 and glioblastoma: In GBM, these include the oligodendrocyte transcription factor (OLIG2), Nestin (NES), prominin‐1 (CD133), Nanog, sex‐determining region Y‐Box 2 (SOX2), octamer‐binding transcription factor 4 (POU5F1), CD44,31 and SRY‐box transcription factor 9 (SOX9).32