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. 2018 Jan 2;18:4. doi: 10.1186/s12885-017-3916-y

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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. 2 — Differences in PD-L1 expression between PTs and LNMs. Case 1 showed negative PD-L1 expression in a PT (a) and positive expression in an LNM (b). Case 2 showed a PT exhibiting a low level of PD-L1 expression (c), and an LNM showing a moderate level of PD-L1 expression (d). Scale bar = 50 μm