SOX2 and neoplasm: Immunohistochemical stainings (Figure 1H–AE) confirmed that tumor cells in areas with undifferentiated, rosette-like, or epithelioid morphology of EBL/MEPL cases, as well as rosette structures of ETANTR cases were immunopositive for stemness- and proliferation-associated markers like SOX2, KI67, and SALL4.