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. 2022 Feb 5;20:74. doi: 10.1186/s12967-022-03274-1

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© The Author(s) 2022

Open AccessThis 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 licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence 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 licence, visit http://creativecommons.org/licenses/by/4.0/. 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 in a credit line to the data.

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Fig. 1 — RNA profiling with cerebrospinal fluid, plasma, and tumor-tissue samples in lung cancer patients with brain metastasis. A Comparison of the number of detected circRNAs in cerebrospinal fluid, plasma, and tumor-tissue samples (*: p-value < 0.05). B The distribution of expression abundance of detected circRNAs in cerebrospinal fluid, plasma, and tumor-tissue samples. C The distribution of the ratio of expression of detected circRNAs to their parental mRNAs in cerebrospinal fluid, plasma, and tumor-tissue samples. D Log2-transformed number of shared circRNAs between different samples from the same or different patient(s) (patient 1 and 20: RNA-seq data not available for cerebrospinal fluid samples, patient 4, 7, 9, 11, 18 and 19: RNA-seq data not available for tumor-tissue samples). E Number of shared circRNAs among all 3 different samples (cerebrospinal fluid, plasma, and tumor-tissue) for individual patient