In addition to the RFG5/RET, we also detected the reciprocal RET/RFG5 transcript in both tumor samples, suggesting that the rearrangement is based on a balanced reciprocal translocation.     ///    "Ret immunohistochemistry indicates that the fusion protein is expressed in all cells of PTC5 tumors, suggesting that RFG5/RET rearrangement is an early event in thyroid carcinogenesis.. "