The present invention relates to a pharmaceutical composition for inhibiting proliferation, migration, or invasion of breast cancer cells comprising a microRNA-1260b inhibitor, microRNA-1260b inhibits the expression of CASP 8 of apoptosis to prevent proliferation, migration and invasion of breast cancer cells. It can be used to inhibit and prevent, treat or predict the prognosis of abnormal proliferation, migration or invasion of breast cancer cells.
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