Ewing sarcoma with ERG gene rearrangements: A molecular study focusing on the prevalence of FUS-ERG and common pitfalls in detecting EWSR1-ERG fusions by FISH..     ///    "In one case, RNA sequencing identified an EWSR1-ERG transcript despite the negative EWSR1 rearrangements by FISH. "    ///    "In fact, ERG gene rearrangements represent the second most common molecular alteration, with EWSR1-ERG being identified in 5-10% of cases, while only a handful of reports document a FUS-ERG fusion. "