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Nanocarriers with low toxicity, high stability, long circulation in blood and triggered drug release at target sites are extremely needed for cancer therapy.In this study, different molar ratios of poly (ethylene glycol) (PEG) were conjugated to poly (amidoamine) dendrimer (PAMAM) by cleavable disulfide bonds, yielding redox and pH dual-responsive nanocarriers (PSSP).