MicroRNAs (miRNAs) are small noncoding RNAs that negatively regulate gene expression by binding to the 3' untranslated region of their target mRNAs. Recent work supports a role for miRNAs in the initiation and progression of human cancer. miRNA-214 not only mediates differentiation, senescence, angiogenesis, cell migration and virus replication but also acts as a tumor suppressor gene and oncogene. Increasing evidence indicates that miRNA-214 may serve as a biomarker in some cancer types. The aim of this review is to highlight and clarify the complexity of miRNA-214 activity, emphasizing its significant therapeutic and diagnostic potential.
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