IDH2 and olfactory neuroblastoma: The neuroectodermal differentiation of specimens from the NEC-like IDH2 (FDR < 0.001) and NEC-like SMARCA4/ARID1A class (FDR < 0.001) as well as olfactory neuroblastomas (FDR < 0.001) was reflected in their similarity with pulmonary neuroendocrine cells (PNEC).