Abstract
Breast cancer is one of the most common cancers. The clinical treatment of breast cancer has made great progress, but the inherent or acquired drug resistance, tumor migration and tumor infiltration, which lead to poor treatment efficiency and eventually death, are still the urgent problems to be solved. As with the occurrence and development of common tumors, the abnormal proliferation, migration and infiltration of breast tumor cells and multidrug resistance (MDR) are closely related to the abnormal expression of specific genes in the cell. At present, many studies have found that the occurrence and development of tumor is closely related to the abnormal expression of microRNA. Therefore, in order to better understand the molecular mechanism of the occurrence and development of breast cancer, it is necessary to study the function of microRNA in breast tumor cells. In this paper, the application of microRNA in the treatment of breast cancer was reviewed, striving for providing effective ideas for the future selection of new strategies to control the development of tumors. Key words: Breast cancer; MicroRNA; Multidrug resistance; Biomarker
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