A further ramification of this infidelity is that the FUS gene, first identified by its fusion with the CHOP gene in t(12;16) of malignant myxoid liposarcoma and related to the EWS gene [24,25], has also been found in Ewing's sarcoma fused with the ERG gene, but also a similar FUS-ERG fusion has been described in some acute myeloid leukaemias [26–28]. This evidence concerns the gene FUS and Ewing sarcoma.