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. 2019 Jun 20;17:207. doi: 10.1186/s12967-019-1957-5

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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. 1 — Expression levels of PD-L1 and HLA-DR in oropharynx squamous cell carcinoma tissue. Tissue specimens of patient with oropharynx squamous cell carcinoma were classified into four groups by immunostaining intensity for PD-L1 or HLA-DR: a, e negative staining; b, f weak staining; c, g moderate staining; d, h strong staining. H&E staining was shown in the right. Representative images are shown. Scale bar is 100 μm

Fig. 1 — Expression levels of PD-L1 and HLA-DR in oropharynx squamous cell carcinoma tissue. Tissue specimens of patient with oropharynx squamous cell carcinoma were classified into four groups by immunostaining intensity for PD-L1 or HLA-DR: a, e negative staining; b, f weak staining; c, g moderate staining; d, h strong staining. H&E staining was shown in the right. Representative images are shown. Scale bar is 100 μm