LDLR and glioblastoma: Next, we attempted to unveil the molecular mechanism of LDLR upregulation in the PD‐treated GBM cells and found that PD increased mRNA expression of LDLR (Fig. 5D) and decreased mRNA expression of inducible degrader of LDLR (IDOL), encoding an E3 ubiquitin ligase that targets LDLR for its lysosomal degradation (Fig. 5E).