IDH1 and oligodendroglial tumor: Focusing only on primary GBMs, hence excluding possible biases due to oligodendroglial tumors or low-grade components, the presented series does not show associations between fluorescence and IDH-1/2 mutations, resulting in 66.7% of patients with Grade 2 fluorescence in the IDH-wt group vs. 46.4% of Grade 2 in the IDH-1/2 mutated group (p = 0.25).