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. 2019 Oct 13;11:1756287219882600. doi: 10.1177/1756287219882600

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© The Author(s), 2019

This article is distributed under the terms of the Creative Commons Attribution-NonCommercial 4.0 License (http://www.creativecommons.org/licenses/by-nc/4.0/) which permits non-commercial use, reproduction and distribution of the work without further permission provided the original work is attributed as specified on the SAGE and Open Access pages (https://us.sagepub.com/en-us/nam/open-access-at-sage).

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Figure 1. — Immunohistochemical staining showing PD-1 (a) and PD-L1 (b) positive controls. PD-1 positive immune cells in 20X (c) and 40X (e) magnification. PD-L1 positive tumor cells in 20X (d) and 40X magnification (f).