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Clinical significance of DAPK promoter hypermethylation in lung cancer: a meta-analysis

Authors Li Y, Zhu M, Zhang X, Cheng D, Ma X

Received 23 November 2014

Accepted for publication 6 January 2015

Published 24 March 2015 Volume 2015:9 Pages 1785—1796


Checked for plagiarism Yes

Review by Single anonymous peer review

Peer reviewer comments 5

Editor who approved publication: Professor Shu-Feng Zhou

Ying Li, Min Zhu, Xiaoju Zhang, Dongjun Cheng, Xitao Ma

Department of Respiratory and Critical Care Medicine, Henan Provincial People’s Hospital,  Zhengzhou, People’s Republic of China

Abstract: Death-associated protein kinase 1 (DAPK) is an important serine/threonine kinase involved in various cellular processes, including apoptosis, autophagy, and inflammation. DAPK expression and activity are deregulated in a variety of diseases including cancer. Methylation of the DAPK gene is common in many types of cancer and can lead to loss of DAPK expression. However, the association between DAPK promoter hypermethylation and the clinicopathological significance of lung cancer remains unclear. In this study, we searched the MEDLINE, PubMed, Web of Science, and Scopus databases, systematically investigated the studies of DAPK promoter hypermethylation in lung cancer and quantified the association between DAPK promoter hypermethylation and its clinicopathological significance by meta-analysis. We observed that the frequency of DAPK methylation was significantly higher in lung cancer than in non-malignant lung tissues (odds ratio 6.02, 95% confidence interval 3.17–11.42, P<0.00001). The pooled results also showed the presence of a prognostic impact of DAPK gene methylation in lung cancer patients (odds ratio 3.63, 95% confidence interval 1.09–12.06, P=0.04). In addition, we summarized these findings and discuss tumor suppressor function, clinicopathological significance, and potential drug targeting of DAPK in lung cancer.

Keywords: lung, adenocarcinoma, squamous cell carcinoma, non-small cell lung cancer, death-associated protein kinase gene, DAPK, methylation, meta-analysis

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