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. 2020 Jun 3;10:9077. doi: 10.1038/s41598-020-65895-0

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© The Author(s) 2020

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as 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 images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Receiver operating characteristic curve analysis. Diagnostic accuracy is evaluated by the area under the curve for identifying metastasis (A, AUC: 0.700, 95% CI: 0.579–0.822) and DOD (B, right, AUC: 0.682, 95% CI: 0.543–0.820). A cut-off of 44.26 pg/mL results in sensitivity of 85.7% and specificity of 56.9% for identifying metastasis and sensitivity of 84.2% and specificity of 50.7% for identifying DOD.