SMARCA1 and Ewing sarcoma: We therefore evaluated the protein expression of SWI/SNF components (and FET‐FOPs) in nuclear extracts from different sarcoma cell lines: myxoid liposarcoma (MLS 402‐91, 2645‐94 and 1765‐92), Ewing sarcoma (EWS TC‐71) and fibrosarcoma (HT1080 wildtype and HT1080 with stable ectopic expression of EGFP or FUS‐DDIT3‐EGFP) using WB analysis (Fig. 1C and Fig. S1A,B).