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. 2017 Dec 29;12:207. doi: 10.1186/s13014-017-0946-1

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© The Author(s). 2017

Open Access This 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 — Overall and lung cancer-specific survivals in stage IIIA-pN2 patients with the exact number of positive lymph nodes ≤3 (a and b) or >3 (c and d) undergoing No PORT or PORT. Abbreviations: PORT, Postoperative radiation. NSCLC, Non-small cell lung cancer