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. 2018 Jul 11;20:71. doi: 10.1186/s13058-018-1004-0

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© The Author(s). 2018

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 — Overall survival, disease-free survival, and expression of PD-L1. a Overall survival and (b) disease-free survival were estimated by using the Kaplan-Meier method and differences were compared using the log-rank test. Patients who were alive at the time of last follow-up were considered censored for overall survival. P values of less than 0.05 were considered statistically significant. SAS version 9.4 (SAS Institute Inc.) was used for analysis. Abbreviations: CI confidence interval, HR hazard ratio, NE not estimated