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. 2015 Mar 30;15:202. doi: 10.1186/s12885-015-1218-9

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© Huang 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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Funnel plot analysis. A: overall survival; B: progression-free survival. A: Funnel plot of the studies on overall survival. B: Funnel plot of the studies on progression-free survival.