GBM stem‐like cells (GSCs) are a subpopulation of GBM cells that display intrinsic chemoresistance and radioresistance.[32] Since GS has been reported to be increased in cancer stem cells, including GSCs,[11, 33] we analyzed gene expression of GLUL, HDAC6, and USP9X in GSCs using the Gene Expression Omnibus (GEO) dataset (GSE23806). The gene discussed is USP9X; the disease is cancer.