GFAP and glioblastoma: In primary glioblastoma cultures, treatment with 15 μM of AZ also significantly reduced GFAP + cell numbers (114.3 ± 35.9 vs. 569.1 ± 157 cells in AZ and untreated groups, respectively), although there were no significant differences between both the untreated versus TMZ group and the AZ versus TMZ group (Fig. 3A).