Reverse transcription-polymerase chain reaction (RT-PCR) and immunohistochemical analyses were used to identify the RET gene and RET/PTC rearrangements.     ///    No RET/PTC-3 rearrangement was detected in any specimen.     ///    "PTCs among Koreans rarely showed RET/PTC rearrangements, but commonly showed increased RET gene expression. "    ///    There are several conflicting reports on the influences of RET expression and RET/PTC rearrangements on the clinical outcome of thyroid cancers.     ///    "Therefore, the wild-type RET gene expression and RET/PTC-1, RET/PTC-2, RET/PTC-3 rearrangements were examined in thyroid carcinomas and other thyroid diseases. "