TERF1 and glioblastoma: As we previously described that TRF1 inhibition effectively blocked glioblastoma growth both in mouse models and in xenograft models of patient‐derived glioma stem cells (GSCs; Bejarano et al, 2017), we next tested whether these newly identified TRF1 modulators were also able to downregulate TRF1 protein levels in patient‐derived GSCs.