We performed reverse transcription-polymerase chain reaction (RT-PCR) for RET/PTC1, RET/PTC2, and RET/PTC3 rearrangements and immunohistochemical staining for the RET gene.     ///    "RET/PTC rearrangement by RT-PCR was positive in only 2 (9.1%) of the 22 patients, and RET/PTC1 and RET/PTC3 were positive in 1 patient each (4.5%). "