In myxoid liposarcoma, which is a type of sarcoma associated with specific translocation DDIT3-FUS or DDIT3-EWSR1, trabectedin proved to be particularly active, and a change in tumor density has often been observed, associated or not with a subsequent reduction in tumor diameters (Taieb et al., 2015; Baheti et al., 2017). The gene discussed is EWSR1; the disease is neoplasm.