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. 2016 Sep 5;14(1):238. doi: 10.1186/s12957-016-0998-y

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© The Author(s). 2016

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. 1 — Hematoxylin and eosin (H&E) staining (×100) (a) and immunohistochemical staining for PD-L1 (b) of surgically resected NSCLC tissue. H&E staining showed invasive adenocarcinoma papillary predominant type and immunohistochemical staining showed negative for PD-L1