GSPT1 and glioblastoma: Although we demonstrated that a severe decrease in GSPT1 expression was induced by CC-885 and that GSPT1-KO in U87 glioblastoma cells resulted in prolonged survival in the mouse model of transplanted brain tumors, GSPT1 mRNA expression levels in 87 human glioblastoma samples from Kobe University Hospital showed no significant relationship with patient prognosis.