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. 2020 Nov 9;10:564248. doi: 10.3389/fonc.2020.564248

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Copyright © 2020 Huang, Fan, Liu, Huang, Cheng, Wang, Duan, Ma, Chen, Wang and Yu

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Begg’s funnel plots for the studies involved in the meta-analysis. (A) Overall survival (OS). (B) Disease-Free Survival (DFS). (C) Progression-free Survival or Recurrence-Free Survival (PFS/RFS).