GSK3B and glioblastoma: To determine whether the association of miR-135b or GSK3β expression with IR resistance is clinically relevant, we examined the expression levels of miR-135b or GSK3β in a cohort of 30 GBM tissues and 30 normal brain tissues using qRT-PCR (miR-135b and GSK3β) and immunohistochemistry (GSK3β) assays.