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. 2022 Jul 8;12:922016. doi: 10.3389/fonc.2022.922016

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Copyright © 2022 Tang, Lv, Liu, Zhan and Gao

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Hematoxylin and eosin (H&E) and immunohistochemical staining of the primary lung cancer and gastric tumor biopsy. H&E staining showed poorly differentiated adenocarcinoma in the primary lung cancer tissue (A) and gastric tumor tissue (C). Immunohistochemical staining showed a positive reaction for thyroid transcription factor-1 (TTF-1) in the primary lung cancer tissue (B) and gastric tumor tissue (D) (magnification, ×200).