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. 2018 Jun 20;16:171. doi: 10.1186/s12967-018-1544-1

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© The Author(s) 2018

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. 2 — CTCs were significantly (p < 0.05) correlated with depth of penetration (a) and were obviously, though not significantly, correlated with TNM classification (b) in postoperative blood, *p < 0.05