All coding exons of IGF1R were subjected to Sanger sequencing in DNAs from 47 tumor samples of Ewing sarcoma (all fusion verified) and 8 Ewing sarcoma cell lines (TC71, A4573, TC32, SK-PN-DW, SK-ES-1, RDES, A673, and CHP100). This evidence concerns the gene IGF1R and Ewing sarcoma.