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. 2015 Aug 12;34:40. doi: 10.1186/s40880-015-0031-9

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© Shen et al. 2015

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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Kaplan–Meier curves of overall survival (OS) in patients with nasopharyngeal carcinoma (NPC). a the entire cohort of NPC patient; b the liver metastasis and extra-liver metastasis groups; c,the groups with single or multiple metastatic lesions; d the groups in different M1 subcategories as proposed.