IDH1 and glioblastoma: A patient with a biopsy-proven, untreated 2.5 cm right pontine grade IV glioblastoma tumor (IHC: IDH1 WT; p53 scattered positive; ATRX WT) was imaged by [18F]FAZA PET/CT in two consecutive days, as proof of precision of the test-retest methodology (Figure 7a,b).