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. 2016 Jun 24;14:188. doi: 10.1186/s12967-016-0943-4

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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. 4 — Overall survival curves in patients with positive or negative programmed cell death-ligand 1 (PD-L1) staining (52.9 vs. 68.2 months, P = 0.069)