Abstract
Although drug-delivery systems have been developed to improve drug biodistribution and efficiency in cancer therapy, some limitations still hinder successful drug targeting and delivery. Multiple drugs in combination seems a promising strategy for cancer therapy. It enables drugs to be delivered to multiple targets and exhibits the additive or synergistic effects of drugs. Physiological barriers are known to be the main obstacles of insufficient drug efficacy and delivery in tumors, but they are likely to be potential targets in combination therapy as well. This article discusses some general considerations for optimizing multiply drug delivery, including drug-release profiles and loading strategies.
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