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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. 2 — PD-L1 expression in esophageal squamous cell carcinoma (ESCC) tumor cells and tumor-infiltrating immune cells. a PD-L1 positive expression in tumor cells and tumor-infiltrating immune cells. Original magnification, 400×, (Black arrow shows the tumor-infiltrating immune cells). b PD-L1 negative expression in tumor cells and tumor-infiltrating immune cells. Original magnification, 400×, (Black arrow shows the tumor-infiltrating immune cells)