Regardless of advances in detection and treatment, breast cancer affects about 1.5 million
women all over the world. Since the last decade, genome-wide association studies (GWAS) have been
extensively conducted for breast cancer to define the role of miRNA as a tool for diagnosis, prognosis
and therapeutics. MicroRNAs are small, non-coding RNAs that are associated with the regulation of
key cellular processes such as cell multiplication, differentiation, and death. They cause a disturbance
in the cell physiology by interfering directly with the translation and stability of a targeted gene transcript.
MicroRNAs (miRNAs) constitute a large family of non-coding RNAs, which regulate target
gene expression and protein levels that affect several human diseases and are suggested as the novel
markers or therapeutic targets, including breast cancer. MicroRNA (miRNA) alterations are not only
associated with metastasis, tumor genesis but also used as biomarkers for breast cancer diagnosis or
prognosis. These are explained in detail in the following review. This review will also provide an impetus
to study the role of microRNAs in breast cancer.
Keywords: micro-RNA, breast cancer, oncomirs, oncosuppressormir, drug targeting, drug resistance.
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