BACH2 and olfactory neuroblastoma: In addition, OTX1 and OTX2 have been identified as two possible molecular markers for sinonasal carcinomas and olfactory neuroblastomas (Micheloni et al., 2019), whereas BACH2 is associated with the neuronal differentiation of N1E-115 neuroblastoma cells (Shim et al., 2006).