IDH1 and oligodendroglioma: The median EOR was larger in Oligodendroglioma than in Diffuse Astrocytoma IDH1/2 wild-type (92% vs. 83%; p = 0.002) and tended to also be larger in Diffuse Astrocytoma IDH1/2 mutated than in Diffuse Astrocytoma IDH1/2 wild-type (87% vs. 83%; p = 0.05).