Abstract
Background
Papillary (PTC) and medullary (MTC) thyroid carcinomas represent two distinct entities, but quite frequently, they may occur simultaneously.
Aim
To provide genetic analysis of PTC and MTC occurring in the same patient (PTC/MTC) to elucidate their origin.
Methods
Sequencing analysis of RAS, BRAF and RET oncogenes hot spots mutations in tumoral and normal tissues of 24 PTC/MTC patients.
Results
Two of 24 patients (8.3 %) were affected by familial MTC (FMTC) harboring RET germline mutations in all tissues. Eight of 22 (36.4 %) sporadic cases did not show any somatic mutation in the three tissue components. Considering the MTC component, 10/22 (45.4 %) patients did not show any somatic mutation, 7 of 22 (31.8 %) harbored the M918T RET somatic mutation and 4/22 (18.2 %) presented mutations in the H-RAS gene. In an additional case (1/22, 4.6 %), H-RAS and RET mutations were simultaneously present. Considering the PTC component, 1 of 24 (4.2 %) patients harbored the V600E BRAF mutation, 1 of 24 (4.2 %) the T58A H-RAS mutation and 1 of 24 (4.2 %) the M1T K-RAS mutation, while the remaining PTC cases did not show any somatic mutation. In one case, the MTC harbored a RET mutation and the PTC a BRAF mutation. None of the mutations found were present in both tumors.
Conclusions
To our knowledge, this is the first study analyzing a possible involvement of RET, BRAF and RAS oncogene mutations in PTC/MTC. These data clearly suggest that the classical activating mutations of the oncogenes commonly involved in the pathogenesis of PTC and MTC may not be responsible for their simultaneous occurrence.
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Acknowledgments
This work was supported in part by Grants from “Associazione Italiana per la Ricerca sul Cancro (AIRC)” (Grant Number: IG2014, ID 15431) and from “Istituto Toscano Tumori (ITT)” (Grant Number: 539999_2013_Elisei_322). The authors would like to acknowledge Martin Zenker from the Institute of Human Genetics, University Hospital Magdeburg, Magdeburg 39120, Germany, and Mohammad R. Ahmadian and Kazem Nouri from the Institute of Biochemistry and Molecular Biology II, Medical Faculty, Heinrich-Heine-University, 40225, Düsseldorf, Germany, for providing the H-RAS plasmids used in the cell transformation assays.
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All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
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An informed consent was provided to the participants and the study was approved by the local ethics committee and by our institutional review board.
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Ciampi, R., Romei, C., Pieruzzi, L. et al. Classical point mutations of RET, BRAF and RAS oncogenes are not shared in papillary and medullary thyroid cancer occurring simultaneously in the same gland. J Endocrinol Invest 40, 55–62 (2017). https://doi.org/10.1007/s40618-016-0526-5
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DOI: https://doi.org/10.1007/s40618-016-0526-5