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. 2020 Dec;9(6):2500–2507. doi: 10.21037/tlcr-20-1212

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2020 Translational Lung Cancer Research. All rights reserved.

Open Access Statement: This is an Open Access article distributed in accordance with the Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International License (CC BY-NC-ND 4.0), which permits the non-commercial replication and distribution of the article with the strict proviso that no changes or edits are made and the original work is properly cited (including links to both the formal publication through the relevant DOI and the license). See: https://creativecommons.org/licenses/by-nc-nd/4.0.

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Pathologic findings of a thoracic metastatic biopsy lesion. (A) HE staining, original magnification ×200. (B) ALK rearrangement detected by immunohistochemistry (IHC), original magnification ×200. (C) Cell keratin 7 (CK7) expression detected by IHC, original magnification ×200. (D) Expression of thyroid transcription factor (TTF)-1 by IHC, original magnification ×200.