BCOR and sarcoma: Other undifferentiated small round cell sarcomas (USRCS), some previously known as “Ewing-like sarcomas” (ELS), make up a diverse group of sarcomas with round (and not so round) cytomorphology including round cell sarcomas with EWSR1-non-ETS fusions, CIC-rearranged sarcoma and sarcoma with BCOR genetic alterations [3].