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. 2017 Jul 27;15:138. doi: 10.1186/s12957-017-1198-0

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© The Author(s). 2017

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 — Kaplan–Meier curves for 5-year overall survival (OS) in different prognostic subgroups. a OS in different CA199 level groups. b OS in different CEA groups. c OS in different liver metastasis diameter groups. d OS in palliative resection and chemotherapy only groups. e OS in different histology groups. f OS in different primary tumor location groups. g OS in different number of liver metastasis groups. h Cox hazards regression analysis for 5-year OS in the entire cohort