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. 2020 Nov 25;8(2):e001558. doi: 10.1136/jitc-2020-001558

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© Author(s) (or their employer(s)) 2020. Re-use permitted under CC BY. Published by BMJ.

This is an open access article distributed in accordance with the Creative Commons Attribution 4.0 Unported (CC BY 4.0) license, which permits others to copy, redistribute, remix, transform and build upon this work for any purpose, provided the original work is properly cited, a link to the licence is given, and indication of whether changes were made. See https://creativecommons.org/licenses/by/4.0/.

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Programmed Death Ligand 1 (PD-L1) expression. (A) PD-L1 percent positivity by IHC on s immune cells by metastatic location. (B) PD-L1 percent positivity by IHC on tumor cells by metastatic location. (C) Venn diagrams of PD-L1 positive ICs (left) and TCs (right) in breast primaries (N=179) and metastatic lesions (N=161). (D) PD-L1 percent positivity on ICs in primary tumors by age (r=0.02, p value=0.7833). IC, immune cells; IHC, immunohistochemistry; TCs, tumor cells.