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. 2017 Jan 10;15:16. doi: 10.1186/s12957-016-1078-z

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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 — Disease-free survival of each independent risk factor. The median disease-free survival (DFS) was 8.4 months in patients with CA19-9 ≥ 529 U/mL, compared to 27.1 months in patients with CA19-9 < 529 U/mL, with a significant difference between the groups (P = 0.0008) (a). The median DFS was 16.1 months in patients with histological grades G2-G4, compared to 51.5 months in patients with G1, with no significant difference (P = 0.2197) (b)