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Molecular confirmation of histologic diagnosis has become mandatory for the diagnosis of Ewing sarcoma family of tumors (ESFT). To validate the diagnosis made by morphology and immunohistochemistry (IHC) by fluorescence in-situ hybridization (FISH) for EWSR1 rearrangement on formalin fixed paraffin embedded (FFPE) tissues. Settings and design A retrospective and prospective observational study. Material and methods All patients who had FISH studies for EWSR1 rearrangement for small round cell tumors during 10 years period were included. Demographic, clinica