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. 2020 Oct 7;6:264. doi: 10.1186/s40792-020-01041-2

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© The Author(s) 2020

Open AccessThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 4 — Histopathological findings. a, b The tumor consists of poorly differentiated adenocarcinoma tissue (a) and clear cells with atypical nuclei (b) (hematoxylin and eosin stain); c CK7 expression is positive; d CK19 expression is positive; e CD56 expression is positive; f CK20 expression is negative; g CD10 expression is negative; h α-fetoprotein expression is negative; i thyroid transcription factor-1 expression is negative