TP53 and glioblastoma: Annexin V‐PE/7‐AAD staining demonstrated that, in p53 wild‐type GBM cells, hsa_circ_0072309 overexpression promotes apoptosis induced by TMZ (Figure 3A), while hsa_circ_0072309 depletion attenuates apoptosis induced by TMZ (Figure 3B).