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. 2019 Sep 13;9:13261. doi: 10.1038/s41598-019-49860-0

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© The Author(s) 2019

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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Variant allele frequencies (VAF) and sequencing depth in tumor tissue and ctDNA. (A) VAFs of all detected variants per gene in tumor tissue (left) and ctDNA (right). Bars indicate range of mutated allele fraction (min, max, mean). (B) Coverage statistics per gene across all samples for tumor tissue and ctDNA. Mean total coverage is significantly higher for ctDNA samples (1010x) than for tumor tissue samples (465x; p < 0.0001, Mann-Whitney). Bars indicate range of mutated allele fraction (min, max, mean).