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. 2019 Jan 26;14:6. doi: 10.1186/s13000-019-0778-4

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© The Author(s). 2019

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. 3 — Kaplan-Meier curves of disease-free survival (DFS) and overall survival (OS) in esophageal squamous cell carcinoma (ESCC) based upon PD-L1 expression in tumor cells. a Patients with PD-L1 expression had significantly shorter DFS than those without PD-L1 expression (median DFS time: 18 verse 41 months, P = 0.008). b There was no statistically significant difference in OS between the patients with positive and negative PD-L1 staining (median OS time: 36 verse 60 months, P = 0.140)