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Data extraction

LH Liya Hu
PZ Peng Zhang
QM Qi Mei
WS Wei Sun
LZ Lei Zhou
TY Tiejun Yin
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Data extraction was independently conducted by two independent investigators (Zhang and Zhou). Any disagreement was resolved by another investigator (Qi Mei). A data extraction sheet based on the Cochrane Consumers and Communication Review Group’s data extraction template was utilized. The following details were extracted: (I) details of the study: first author, publication year, country of patients and sample size; (II) clinicopathological features: race, gender, tumour TNM stage, vascular invasion, lymphatic invasion, lymph node invasion, pleural metastasis, location of protein expression; (III) Survival analysis related features: the proportion and patient number of positive PDPN expression, cut-off standard for the definition of positive staining or staining intensity, follow-up time and survival data (OS and PFS). Two reviewers (Zhang and Zhou) collected the data independently from every eligible study. Any unclarity or lack of disagreement was resolve by discussion with a third reviewer until final consensus.

Copyright and License information: The Author(s) ©2020
Open AccessThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/. 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 in a credit line to the data.

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