also demonstrated that increasing the number of endothelial cells in brain tumor xenografts leads to an increase in the self‐renewing of cancer stem cells and a higher rate of tumor expansion.[27] Research conducted with different types of cancer, including glioma, indicates that endothelial cells can protect tumor cells from radiation‐induced damage,[29, 30, 31] and the use of antibodies suppressing vascular endothelial growth factor (VEGF) associated with endothelial cell growth can sensitize even radioresistant GBM cell lines such as U87 to low radiation doses.[32] Farin et al. This evidence concerns the gene VEGFA and glioma.