EWSR1 and sarcoma: We found that all sarcoma lines tested including 6 EWS (A673, EWS502, Rh1, SKNMC, TC32, TC71), 3 ARMS (Rh18, Rh30, Rh41), 2 ERMS (RD, Rh36), 3 OS (OS17, U2OS, SaOS2) and 1 FS (HT1080) were IGFR1+ (Fig 1C).