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. 2015 Apr 18;15:305. doi: 10.1186/s12885-015-1288-8

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© Chen et al.; 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 rates of 321 patients with T3-T4 stage NPC stratified by maximum primary tumor diameter. A. overall survival. B. failure-free survival. C. distant metastasis-free survival. D. local relapse-free survival. Abbreviations: 95% CI, 95% confidence interval; HR, hazard ratio; No at risk, number at risk.