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. 2015 Apr 15;10:89. doi: 10.1186/s13014-015-0401-0

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© He et al.; licensee BioMed Central. 2015

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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Kaplan-Meir survival curves for 346 patients with locally-advanced nasopharyngeal carcinoma (NPC). (A) Overall survival (OS), (B) local relapse–free survival (LRFS), (C) disease-free survival (DFS) for patients stratified by the presence and absence of a residual tumor at the end of IMRT. P-values were calculated using the unadjusted log-rank test; Hazard ratios (HR) were calculated using the unadjusted Cox proportional hazards model; 95% CI: 95% confidence interval.