IGFBP2 and glioblastoma: In this study, we aimed to explore the expression of IGFBP‐2 and GRP78 protein and mRNA (IGFBP‐2 and HSPA5) in our GSC and non‐malignant neural stem cell (NSC) lines and investigate potential protein biomarkers in our glioblastoma clinical biopsy cohorts with patient covariates and overall survival data.