Passive targeting refers to the method of delivering therapeutic agents to specific sites in the body based on natural physiological processes, without the need for active guidance or external stimuli. This approach takes advantage of the inherent characteristics of certain tissues, such as their vascularity or permeability, to enhance drug accumulation at the target site, which can significantly improve treatment efficacy. In the context of quantum dots, passive targeting plays a crucial role in maximizing drug delivery and effectiveness in therapies like photodynamic and photothermal treatments.
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