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Patterns of FOXE1 Expression in Papillary Thyroid Carcinoma by Immunohistochemistry

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Title: Patterns of FOXE1 Expression in Papillary Thyroid Carcinoma by Immunohistochemistry
Authors: Bychkov, Andrey / Saenko, Vladimir / Nakashima, Masahiro / Mitsutake, Norisato / Rogounovitch, Tatiana / Nikitski, Alyaksandr / Orim, Florence / Yamashita, Shunichi
Issue Date: 8-Jul-2013
Publisher: Mary Ann Liebert Inc.
Citation: Thyroid, 23(7), pp.817-828; 2013
Abstract: Background: FOXE1, a thyroid-specific transcription factor also known as TTF-2, was recently identified as a major genetic risk factor for papillary thyroid carcinoma (PTC). Its role in thyroid carcinogenesis, however, remains unknown. The purpose of the present study was to assess the relationship between the FOXE1 immunohistochemical features and the clinical and genetic characteristics of PTC. Methods: Immunohistochemical staining of FOXE1 was performed in 48 PTC cases. Two single nucleotide polymorphisms immediately inside (rs1867277) or in the vicinity (rs965513) of the FOXE1 gene were genotyped by direct sequencing. Histopathological, clinical, and genetic data were included in statistical analyses. Results: FOXE1 exhibited cytoplasmic overexpression in tumor tissue compared to the normal counterpart (p<0.001). Both cancer and normal thyroid cells demonstrated the highest FOXE1 scores in the areas closest to the tumor border (<300 μm) compared with more distant areas (p<0.001). No differences in FOXE1 staining distributions were found between microcarcinomas and PTC of larger size, between different histopathological variants of PTC, and encapsulated and nonencapsulated tumors. Multivariate regression analysis revealed that nuclear FOXE1 expression in neoplastic cells in the vicinity of the tumor border independently associated with the genotype at rs1867277 (the dominant model of inheritance, p=0.037) and tumor multifocality (p=0.032), and with marginal significance with capsular invasion (p=0.051). Conclusions: FOXE1 overexpression and translocation to the cytoplasm are phenotypic hallmarks of tumor cells suggesting that FOXE1 is involved in the pathogenesis of PTC. Nuclear FOXE1 expression in tumor cells in the vicinity of the PTC border is associated with the presence of a risk allele of rs1867277 (c.-238G>A) in the 5′ untranslated region of the FOXE1 gene, as well as with pathological characteristics of PTC, suggesting possible FOXE1 involvement in the facilitation of tumor development beginning at an early stage.
URI: http://hdl.handle.net/10069/33884
ISSN: 10507256
DOI: 10.1089/thy.2012.0466
Rights: This is a copy of an article published in the Thyroid © 2013 Mary Ann Liebert, Inc.; Thyroid is available online at: http://online.liebertpub.com.
Type: Journal Article
Text Version: publisher
Appears in Collections:Articles in academic journal

Citable URI : http://hdl.handle.net/10069/33884

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