28 January 2016 : Meta-Analysis
Med Sci Monit 2016; 22:302-309
BACKGROUND: MALAT-1 is a highly conserved nuclear long non-coding RNA (lncRNA). The overexpression of MALAT-1 has been reported in several types of cancers. This meta-analysis was conducted to further investigate its potential role as a prognostic indicator in various cancers.
MATERIAL AND METHODS: The meta-analysis was performed by use of systematic search terms in 13 databases for qualified papers on prognosis in cancer from inception to June 30, 2015. The combined hazard ratios (HRs) with 95% confidence interval (95% CI) were computed to demonstrate the effect of MALAT-1 on prognosis of cancers.
RESULTS: A total of 590 papers were initially identified, and 17 studies were finally included in this paper. Meta-analysis was accomplished with a total of 1626 patients. Combined HRs and 95% CI were calculated by fixed-effects or random-effects models. The quality assessment of included studies was performed by the Newcastle-Ottawa scale (NOS). High expression of MALAT-1 was found to be an indicator of poor prognosis in overall survival (OS) (HR=1.84, 95% CI: 1.27–2.67) and disease-free survival (DFS) (HR=2.37, 95% CI: 1.55–3.62). In subgroups, the associations between MALAT-1 and survival were also apparent, for instance, in country subgroup: China (HR=1.85, 95% CI: 1.14–2.99).
CONCLUSIONS: The overexpression of MALAT-1 may be a potential prognostic indicator for various human cancers.
Keywords: Neoplasms - genetics, Prognosis, Publication Bias, RNA, Long Noncoding - genetics, Survival Analysis
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