MicroRNAs in osteosarcoma: from biological players to clinical contributors, a review.

Osteosarcoma is a primary malignant bone tumour with high morbidity that occurs mainly in children and adolescents. While the molecular basis of osteosarcoma has received considerable attention, the cellular and molecular mechanisms underlying pre- and postoperative metastasis formation and the development of chemoresistance remain unclear. MicroRNAs (miRNAs), a class of 22-nucleotide noncoding RNAs, have emerged as critical components of gene-regulatory networks controlling numerous important pathophysiological processes, including the initiation and progression of cancers. Studies on miRNAs have opened new avenues for both the diagnosis and treatment of cancer. This review discusses the roles of miRNAs in osteosarcoma and their potential applications for the diagnosis, prognosis and treatment of this malignancy. As a rapidly evolving field of basic and biomedical science, miRNA research will have a revolutionary impact on the management of osteosarcoma.