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. 2017 Dec 12;17:195. doi: 10.1186/s12890-017-0534-z

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© The Author(s). 2017

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 3 — Values of napsin A and CEA in ELF in the patients with primary lung adenocarcinoma. a Levels of napsin A in ELF (ELF-napsin A) in the patients with primary lung adenocarcinoma (n = 29, P < 0.001). b Values of CEA in ELF (ELF-CEA) in the patients with primary lung adenocarcinoma (n = 29, P = 0.634). c ELF-napsin A in the patients with primary lung adenocarcinoma who were undiagnosed by bronchoscopy and finally diagnosed by surgery (n = 18, P = 0.001). d ELF-CEA in the patients with primary lung adenocarcinoma who were undiagnosed by bronchoscopy and finally diagnosed by surgery (n = 18, P = 0.571). CEA: carcinoembryonic antigen; ELF: epithelial lining fluid