For the high-grade gliomas analyzed by Sun [24] and Gravendeel [20], our analysis reveals a clear bimodal distribution of IL13Rα2 expression for the high-grade gliomas that is particularly evident for GBM (WHO IV) specimens (Figure 1A), as also noted by Jarboe et al. [8]. This evidence concerns the gene IL13RA2 and glioblastoma.