Functional interchangeability of the FET-NTD is also reflected in human sarcomas: both EWS-CHOP and FUS-CHOP characterize myxoid liposarcoma [5, 94], and EWS-NR4A3 and TAF15-NR4A3 are found in extraskeletal myxoid chondrosarcoma [106]. This evidence concerns the gene TAF15 and sarcoma.