CD44 and glioblastoma: The expression of CDCP1 was positively correlated with the expression of mesenchymal (MES) GBM markers such as CD44, STAT3, and TGFB1, while the expression of CDCP1 was negatively correlated with the expression of Olig2, ASCL1 and DLL3 in proneural (PN) GBM (Fig. 6C–H).