CEBPB and glioblastoma: Therefore, we analyzed the protein expression patterns of neural stem cell markers CD133 [35] and GFAP-δ [36], and the activation of key markers of (epithelial-) mesenchymal transformation C/EBP-β, NF-κB (PS536-p65 and c-Rel) and STAT3 [34] (Fig 3) on FFPE tumor tissue obtained from a cohort of consecutive glioblastoma patients.