Cytological and molecular diagnosis of Hürthle cell thyroid tumors: Analysis of three cases

Titov,Sergei E.; Poloz,Tatiana L.; Veryaskina,Yulia A.; Anishchenko,Vladimir V.

doi:10.3892/mco.2021.2311

Cytological and molecular diagnosis of Hürthle cell thyroid tumors: Analysis of three cases

Authors:
- Sergei E. Titov
- Tatiana L. Poloz
- Yulia A. Veryaskina
- Vladimir V. Anishchenko
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Affiliations: Department of The Structure and Function of Chromosomes, Institute of Molecular and Cellular Biology SB RAS, Novosibirsk 630090, Russia, Department of Cytopathology, Clinical Hospital RZD‑Medicine, Novosibirsk 630003, Russia, Department of Surgery, Novosibirsk State Medical University, Novosibirsk 630091, Russia
Published online on: May 28, 2021 https://doi.org/10.3892/mco.2021.2311
Article Number: 149
Copyright: © Titov et al. This is an open access article distributed under the terms of Creative Commons Attribution License.

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Abstract

The cytological diagnosis of Hürthle cell (oncocytic) thyroid tumors by means of fine‑needle aspiration biopsy represents a challenge, as Hürthle cell polymorphism and atypia alone are not indications of malignancy. In our recent work, an original diagnostic algorithm was proposed, which identified and typed malignant thyroid tumors by analyzing the molecular markers of cytological preparations. The aim of the present study was to assess the effectiveness of this algorithm at detecting Hürthle cell thyroid tumors in clinical samples used for cytological examination. Cytological and histological examinations of the biopsy material were performed for three patients with nodular neoplasms. Biopsy material of these patients was analyzed by quantitative PCR using preselected molecular markers [normalized concentrations of High‑mobility group AT‑hook 2 mRNA, three microRNAs (miRNAs or miRs; miR‑146b, miR‑221 and miR‑375) and the mitochondrial (mtDNA)/nuclear DNA ratio]. The results revealed that the molecular test determined the malignancy of three cases of Hürthle cell tumor. This method may therefore be used to complement the cytological diagnosis of fine‑needle aspiration biopsy. In all three cases, there was an increased content of mtDNA, indicating Hürthle cell malignancies. Furthermore, in the first case [Hürthle cell carcinoma (HCC)], increased miRNA‑221 content was detected, which also indicated malignancy. In the second case (Hürthle cell papillary thyroid carcinoma), an increased level of miRNA‑146b was present, which indicated papillary carcinoma. In the third case (Hürthle cell adenoma), no markers of malignancy were identified. The present study demonstrated that molecular testing together with cytological analysis can reduce the isk of error in the preoperative cytological diagnosis of unclear or ambivalent cases.

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