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. 2014 Feb 27;14:136. doi: 10.1186/1471-2407-14-136

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Copyright © 2014 Zhang et al.; licensee BioMed Central Ltd.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License ( http://creativecommons.org/licenses/by/2.0), 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 188 nasopharyngeal carcinoma patients. (A) Overall survival, (B) failure-free survival, (C) distant metastasis-free survival, and (D) local relapse–free survival rates of patients with complete response of primary tumor (CRPT), partial response of primary tumor (PRPT), and stable disease of primary tumor (SDPT) at the end of radiotherapy. Hazard ratios (HR) were calculated with the unadjusted Cox proportional hazards model; P-values were calculated with the unadjusted log-rank test. 95% CI, 95% confidence interval.