Out of the 12 sarcoma cfDNA samples, five sarcoma fusion genes (EWSR1-ATF1, MEAF6-PHF1, PAX3-FOXO1, EWSR1-FLI1, SS18-SSX2) and one MDM2 amplification were detected following analysis (50% of structural variants detected). This evidence concerns the gene FLI1 and sarcoma.