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MicroRNA-34a(miR-34a), a pivotal member of the p53 network, was found to be down-regulated in multiple types of tumors and further reported as a tumor suppressor microRNA. However, the profile and biological effects of miR-34a in breast cancer are still unclear. In this study, we aimed to determine the effect of miR-34a on the growth of breast cancer and to investigate whether its effect is achieved...