MUC5B and glioblastoma: A previous study demonstrated that the radioresistance of a glioblastoma presented higher CSC properties.5, 21, 22 Here, we sought to investigate the involvement of GBM‐MG1, GBM‐MG2, GBM‐MG1R, and GBM‐MG2R cells in CSC properties using self‐renewal assays.