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. 2019 Oct 15;9:1055. doi: 10.3389/fonc.2019.01055

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Copyright © 2019 Song, Kim, Kwon, Kim, Choi and Jang.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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PD-L1 (A), PD-1 (B), and CD8 (C) expression frequency. (A) Overall, 90.6% of thymic epithelial tumors (TETs) exhibited immunopositivity for PD-L1 at cut-off of more than 1%. High PD-L1 expression was observed in 39.0% (cut-off over 50%). (B) Overall, 53.6% of TETs showed immunopositivity for PD-1. (C) Overall, 27% of thymic carcinoma samples exhibited immunopositivity for CD8.