STAT3 and glioblastoma: A number of transcription factors—including STAT3 (signal transducer and activator of transcription 3), C/EBP-β (CCAAT-enhancer-binding protein-β), and, more recently, the transcriptional coactivator TAZ (transcriptional coactivator with PDZ-binding motif)—have been identified as important regulators of the mesenchymal phenotype in glioblastomas [5].