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Multiple combination therapies with chemotherapeutic drugs and inhibitors of drug resistance have been effective in the clinical cases, but concerns have been raised about the severe toxicity of these chemotherapeutic drugs. Herein, we report a potent and safe combination strategy of cancer-specific doxorubicin (DOX) prodrug nanoparticles (PNPs) and B-cell lymphoma-2 (Bcl-2) anti-apoptotic inhibitor, Navitoclax, to overcome acquired drug resistance during chemotherapy. The cancer-specific PNPs were constructed by conjugating cathepsin B