The NEC-like SMARCA4/ARID1A class (n = 33) mainly consisted of tumors that had been diagnosed as SNUCs, neuroendocrine carcinomas and olfactory neuroblastomas, but also single adenocarcinomas, poorly differentiated carcinomas and squamous cell carcinomas (Fig. 2J). This evidence concerns the gene ARID1A and olfactory neuroblastoma.