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. 2019 Oct 25;8:26. doi: 10.1186/s40164-019-0150-0

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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. 5 — Forest plot of risk ratio (RR). Relative objective response rate (ORR) of α-CTLA-4 plus α-PD-1 combination treatment compared with other treatments in the high PD-L1 expression status (a) and low PD-L1 expression status (b). CI: confidence interval