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Prognostic significance of PD-L1 expression in patients with gastric cancer in East Asia: a meta-analysis

Authors Liu Y, Wang X, Wang Y, HU X, Yan J, Zhang Y, Wang W, Yang R, Feng Y, Gao S, Feng X

Received 16 December 2015

Accepted for publication 9 March 2016

Published 4 May 2016 Volume 2016:9 Pages 2649—2654


Checked for plagiarism Yes

Review by Single-blind

Peer reviewers approved by Dr Narasimha Reddy Parine

Peer reviewer comments 3

Editor who approved publication: Dr William Cho

Yong-Xuan Liu, Xin-Shuai Wang, Yu-Feng Wang, Xiao-Chen Hu, Jun-Qiang Yan, Ya-Li Zhang, Wei Wang, Rui-Jie Yang, Ying-Ying Feng, She-Gan Gao, Xiao-Shan Feng

Department of Oncology, Cancer Institute, The First Affiliated Hospital of Henan University of Science and Technology, Luoyang, People’s Republic of China

Abstract: The overexpression of programmed cell death-ligand 1(PD-L1) has been observed in gastric cancer (GC). However, whether the expression of PD-L1 in tumor cells or blood serum is associated with the prognosis of patients with GC remains unclear. Therefore, we performed a meta-analysis to evaluate the prognostic significance of PD-L1 expression in GC. Electronic databases were searched systematically. Studies that met the inclusion criteria were included in the meta-analysis. Data concerning the hazard ratio (HR) for overall survival and disease-free survival with a 95% confidence interval (CI) according to the expression status of PD-L1 evaluated by immunohistochemistry or enzyme-linked immunosorbent assay were extracted. The data were analyzed using a random effects model. Subgroup analyses were proposed. Our results showed that eight studies with 950 patients met the inclusion criteria and were included in the meta-analysis. The pooled HR for overall survival indicated that patients with PD-L1-positive expression had significantly shorter survival time compared with the PD-L1-negative group (HR 1.60, 95% CI 1.09–2.36, P=0.012). The pooled HR for disease-free survival demonstrated that the difference between the two groups was not statistically significant (HR 1.02, 95% CI 0.32–3.20, P=0.98). In conclusion, our results indicate that the evaluation of PD-L1 overexpression in GC tissue or blood serum may be useful in the future as a novel prognostic factor.

Keywords: PD-L1, gastric cancer, prognostic, meta-analysis, OS, immunohistochemistry

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