title: Prognostic significance of miR-126 in various cancers: a meta-analysis.
abstract: OBJECTIVE
  Recent studies have demonstrated that microRNA-126 (miR-126) might be a promising prognostic factor for cancer patients. This meta-analysis was conducted to assess the effectiveness of miR-126 as a prognostic biomarker for various cancers.
  
  
  METHODS
  The search of studies was performed by using PubMed and Embase until January 22, 2016. Pooled hazard ratio (HR) with 95% confidence interval (CI) for patients' survival was calculated. A fixed-effect or random-effects model was applied according to heterogeneity. The trim and fill method was used to adjust pooled HR.
  
  
  RESULTS
  In all 17 articles comprising of 2,437 participants were included in this meta-analysis. The results indicated that a high level of miR-126 played a favorable role in the overall survival (HR 0.70, 95% CI: 0.62-0.79, random-effects model), with a heterogeneity measure index of I (2)=63.2% (P<0.01). Subgroup analyses showed that pooled HR was more significant in patients with digestive system cancers (HR 0.70, 95% CI: 0.59-0.83, fixed-effects model) and respiratory system cancers (HR 0.71, 95% CI: 0.59-0.85, random-effects model). Owing to publication bias, HR was adjusted to 0.59 (0.463-0.752, P<0.01) by the trim and fill method.
  
  
  CONCLUSIONS
  miR-126 could be a promising biomarker for cancer prognosis prediction, especially in patients with digestive or respiratory system cancers.
authors.affiliation: School of Medicine and Life Sciences, University of Jinan, Shandong Academy of Medical Sciences, Jinan, Shandong Province, People's Republic of China; Sixth Department of Radiation Oncology, Shandong Cancer Hospital & Institute, Jinan, Shandong Province, People's Republic of China.
authors.forename: Yuanli
authors.initials: Y
authors.lastname: Dong
authors.affiliation: Sixth Department of Radiation Oncology, Shandong Cancer Hospital & Institute, Jinan, Shandong Province, People's Republic of China.
authors.forename: Chengrui
authors.initials: C
authors.lastname: Fu
authors.affiliation: Sixth Department of Radiation Oncology, Shandong Cancer Hospital & Institute, Jinan, Shandong Province, People's Republic of China.
authors.forename: Hui
authors.initials: H
authors.lastname: Guan
authors.affiliation: Sixth Department of Radiation Oncology, Shandong Cancer Hospital & Institute, Jinan, Shandong Province, People's Republic of China.
authors.forename: Zicheng
authors.initials: Z
authors.lastname: Zhang
authors.affiliation: Sixth Department of Radiation Oncology, Shandong Cancer Hospital & Institute, Jinan, Shandong Province, People's Republic of China.
authors.forename: Tao
authors.initials: T
authors.lastname: Zhou
authors.affiliation: Sixth Department of Radiation Oncology, Shandong Cancer Hospital & Institute, Jinan, Shandong Province, People's Republic of China.
authors.forename: Baosheng
authors.initials: B
authors.lastname: Li
keywords: cancer; miR-126; prognosis