FLI1 and Ewing sarcoma: The RT-PCR of the fusion products of the two most common Ewing sarcoma translocations t(11;22) EWSR1/FLI1 and t(21;22) ESWR1/ERG was negative; however, FISH analysis revealed the EWSR1 gene rearrangement (Figure 2(c)), confirming the diagnosis of Ewing sarcoma and suggesting the presence of one of the rare ES translocation types.