Reverse transcription-polymerase chain reaction using RNA extracted from formalin-fixed, paraffin-embedded tissues demonstrated transcripts of the EWSR1-ATF1 (31/33) or EWSR1-CREB1 fusion gene (2/33).     ///    "In addition, the tumors occurring in the gastrointestinal tract may have a variant fusion gene EWSR1-CREB1. "