CD274 and glioblastoma: The pronounced GBM treatment efficacy can be ascribed to three key factors: (i) improved nanoparticle‐mediated GBM targeting delivery of therapeutic agents by greatly enhanced blood circulation time and blood–brain barrier penetration; (ii) inhibited cellular DNA repair and enhanced TMZ sensitivity to tumor cells; (iii) enhanced anti‐tumor immune responses by inducing immunogenic cell death and inhibiting PD‐1/PD‐L1 conjugation leading to enhanced expression of CD4+ and CD8+ T cells.