IDH1 and glioblastoma: Thirty of 38 tumors were astroglial tumors, including one pilomyxoid astrocytoma, one subependymal giant cell astrocytoma WHO Grade 1, one ganglioglioma WHO Grade 1 with astroglial differentiation of the glial cell portion, 5 astrocytomas WHO Grade 2, 7 astrocytomas WHO Grade 3, 2 IDH1-mutated astrocytomas WHO Grade 4 and 13 IDH-wildtype glioblastomas WHO Grade 4.