Formalin-fixed, paraffin-embedded (FFPE) gliomas were retrieved from pathology archives. Deidentified tissue microarrays (TMAs) were constructed from the gliomas. Three 2-mm diameter cores per tumor were obtained, with each core embedded in a separate TMA block. A total of 104 cases comprised the TMAs, including 9 nonneoplastic controls (cortical dysplasias), 9 grade II astrocytomas, 11 grade III astrocytomas, 12 anaplastic oligodendrogliomas, 16 grade II oligodendrogliomas, and 47 grade IV glioblastomas (GBMs).
Deidentified fresh glioma specimens were prospectively banked via snap-freezing in liquid nitrogen at the time of surgery. Each case was annotated with the corresponding pathologic diagnosis and IDH1/2 mutation status.