To investigate the frequency of RET rearrangement in Chinese papillary thyroid carcinomas, we have performed RT-PCR to amplify specific RET/PTC transcripts.     ///    "Although the cause of the high frequency of RET/PTC oncogenes in Chinese papillary thyroid carcinomas is unknown, our study suggests that RET rearrangement is an important genetic lesion underlying the development of thyroid papillary carcinoma in Taiwan.. "    ///    "Among the papillary thyroid carcinomas of 11 patients examined, we have identified 2 containing RET/PTC1, 3 containing RET/PTC2, and 1 containing RET/PTC3 oncogenes. "    ///    "Rearrangement of the RET kinase domain to 3 partner genes has been described, of which the RET/PTC1 is the most common. "