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. 2014 Dec 29;12:397. doi: 10.1186/1477-7819-12-397

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© Sun and Zhang; licensee BioMed Central. 2015

This article is published under license to BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly credited. 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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Survival curves of patients according to CEA, CA199, CA724, and CA242 pretreatment serum positivity. A. The difference between CEA-negative patients and CEA-positive patients was not statistically significant (P = 0.085). B. The difference between CA19-9-negative patients and CA19-9-positive patients was statistically significant (P = 0.000). C. The difference between CA72-4-negative patients and CA72-4-positive patients was statistically significant (P = 0.002). D. The difference between CA242-negative patients and CA242-positive patients wasnot statistically significant (P = 0.409).