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. 2020 Nov 19;9(1):1844403. doi: 10.1080/2162402X.2020.1844403

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© 2020 The Author(s). Published with license by Taylor & Francis Group, LLC.

This is an Open Access article distributed under the terms of the Creative Commons Attribution-NonCommercial License (http://creativecommons.org/licenses/by-nc/4.0/), which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Figure 1. — PD-L1 staining (E1L3N, Cell signaling technology) in head and neck carcinoma sample shows a weak staining of the tumor component (t) contrasting with a strong staining of the immune component (i) located in the stroma. Pathologists have scored this case 15% by tumor proportion score (TPS) and 40 by combined positive score (CPS)