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Co-delivery of chemotherapeutic drug and microRNA is a promoting strategy for tumor therapy due to its synergistic effect.In our study, hydrophobic doxorubicin (DOX) and negative miR-34a were simultaneously delivered by self-assembly micelles system (SHRss) which using oly(1-arginine)-poly(1-histidine)-stearoyl as the building unit for copolymers.