EWSR1 and Ewing sarcoma: Ewing sarcoma RNA binding protein 1 (EWSR1) gene fusion, Capicua transcriptional repressor gene(CIC)-rearranged genes, and BCL6 corepressor (BCOR)-rearranged genes are usually tested to clarify their genetic types, which include Ewing sarcomas, round-cell sarcomas with EWSR1 gene fusion and non-ETS fusion, CIC-rearranged sarcomas, and BCOR-rearranged sarcomas.