Nevertheless, dexamethasone, a common corticosteroid with a high glucocorticoid activity, has been found to significantly increase invasion, cell proliferation, and angiogenesis in vitro or in vivo in GBM stem cell lines, including GBM stem cells that are IDH1 wild‐type (Luedi et al., 2018). The gene discussed is IDH1; the disease is glioblastoma.