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Epidermal growth factor receptor (EGFR), cyclin dependent kinase 4 (CDK4), mouse double minute 4 (MDM4), and platelet-derived growth factor receptor alpha (PDGFRA) gene expression levels in GBM (n = 83) vs. normal brain tissues (n = 42). (Non-parametric comparisons performed using the Mann–Whitney U test). (SPSS 25.0, IBM SPSS, Armonk, NY, USA).
