Among these, undifferentiated small round cell sarcomas (USRCSs) comprise multiple subcategories, including the recently described CIC-rearranged sarcomas, sarcomas with BCOR alterations, and non-ETS fused sarcomas (such as NFATC2 and PATZ1 sarcomas) (Nagy 2020). The gene discussed is BCOR; the disease is sarcoma.