Insulin-like growth factor 1 receptor (IGF-1R) and tyrosine kinase orphan-like receptor 1 (ROR1) are highly expressed in various sarcoma cell lines such as alveolar or embryonal rhabdomyosarcoma, Ewing sarcoma, fibrosarcoma and osteosarcoma [82]. This evidence concerns the gene IGF1R and Ewing sarcoma.