RET rearrangements in archival oxyphilic thyroid tumors: New insights in tumorigenesis and classification of Hürthle cell carcinomas?

Petra B. Musholt, Florian Imkamp, Reinhard Von Wasielewski, Kurt W. Schmid, Thomas J. Musholt, Alan P B Dackiw, Martha A. Zeiger, Allan Siperstein

Research output: Contribution to journalArticle

33 Scopus citations

Abstract

Background. Oncocytic carcinomas (Hürthle cell carcinomas [HCCs]) are commonly considered a subgroup offollicular thyroid carcinomas (FTCs). Recent characterization of a subgroup of "Hürthle cell" papillary thyroid carcinomas (PTCs) was based on the identification of PTC-speciflc RET hybrid oncogenes in HCCs. Methods. We examined 27 HCCs, 4 oxyphilic FTCs, 5 oxyphilic PTCs, 2 poorly differentiated carcinomas arising from HCCs (HCC-UTCs), and 16 oxyphilic adenomas. Total RNA was extracted from paraffin-embedded thyroid neoplasms by a novel macrodissection technique that uses a cylindric punch. After reverse transcription-polymerase chain reaction-based screening for RET rearrangements, the samples were tested for all known RET/PTC 1 to 11 hybrids with the use of artificially constructed chimeric sequences as controls. Results. The elimination of C cells by punching dissection significantly reduced RET wild-type expression. RET hybrid oncogenes (7x RET/PTC1, 1x RET/PTC1L, 2x RET/PTC3, 5 uncharacterized RET/PTCx) were demonstrated in 7 of 27 HCCs, in 0 of 4 oxyphilic FTCs, in 4 of 5 oxyphilic PTCs, in 1 of 2 HCC-UTCs, and in 3 of 16 oxyphilic adenomas. Conclusion. Our results suggest that the expression of rearranged RET hybrid oncogenes (1) is present in a similar percentage of HCCs when compared with the literature on nonoxyphilic PTCs, (2) defines PTC-like HCCs better than histomorphologic characterization, (3) excludes HCCs as a subgroup of FTCs, and (4) may play a role in the early tumorigenesis of oncocytic tumors.

Original languageEnglish (US)
Pages (from-to)881-889
Number of pages9
JournalSurgery
Volume134
Issue number6
DOIs
StatePublished - Dec 2003

ASJC Scopus subject areas

  • Surgery

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    Musholt, P. B., Imkamp, F., Von Wasielewski, R., Schmid, K. W., Musholt, T. J., Dackiw, A. P. B., Zeiger, M. A., & Siperstein, A. (2003). RET rearrangements in archival oxyphilic thyroid tumors: New insights in tumorigenesis and classification of Hürthle cell carcinomas? Surgery, 134(6), 881-889. https://doi.org/10.1016/j.surg.2003.08.003