Low microRNA-139 expression associates with poor prognosis in patients with tumors: A meta-analysis

microRNA-139 (miR-139) is dysregulated in various types of tumors and plays a key role in carcinogenesis. miR-139 may be used as a diagnostic and prognostic biomarker of cancers. However, the data from the literature are not consistent. The present study aimed to verify the prognostic and diagnostic values of miR-139 in solid tumors. PubMed, Web of Science and Embase databases were searched and publications from January 2011 to August 2017 were...