Stimuli-Responsive Drug Delivery Systems in Cancer Therapy
Summary
Stimuli-responsive drug delivery systems have emerged as sophisticated platforms designed to release therapeutic agents in response to specific internal cues within the tumour microenvironment or external triggers applied by clinicians. These systems typically employ nanocarriers—such as polymeric micelles, liposomes, metal–organic frameworks and inorganic nanoparticles—engineered to undergo physicochemical transformations upon exposure to pH gradients, redox potential, enzymes or external stimuli such as light, magnetic fields and ultrasound. By exploiting differences between healthy and malignant tissues—most notably acidic pH, elevated glutathione concentrations, overexpressed enzymes and hypoxia—these ‘smart’ carriers achieve spatiotemporal control of drug release, thereby enhancing intratumoural accumulation, overcoming multidrug resistance and minimising off-target toxicity. Externally triggered systems offer additional control, enabling on-demand activation at precise locations through non-invasive stimuli. Advances in dual- or multi-responsive platforms further enrich therapeutic flexibility, combining several triggers to refine dosing regimens in real time. Collectively, these innovations mark a shift towards precision oncology by integrating material science, tumour biology and clinical need to amplify efficacy and safety in cancer chemotherapy and theranostics.
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Stimuli-Responsive Drug Delivery Systems in Cancer Therapy publication trend
The graph below shows the total number of articles in stimuli-responsive drug delivery systems in cancer therapy across all publications each year (not limited to Nature Index journals).
Technical terms
Stimuli-responsive system: A delivery platform engineered to alter its structure or properties in response to defined internal or external triggers, releasing a therapeutic cargo.
Tumour microenvironment (TME): The unique biological and chemical milieu surrounding cancer cells, characterised by acidic pH, hypoxia, enzymatic activity and oxidative stress.
Nanocarrier: A sub-micrometre particle—often polymeric, lipidic or inorganic—designed to transport, protect and release drugs at target sites.
Redox potential: A measure of the reducing or oxidising conditions in a biological environment, commonly exploited via glutathione-mediated bond cleavage.
Enzyme-responsive: Describes a material or bond that undergoes cleavage or transformation upon interaction with specific biological enzymes overexpressed in target tissues.
External stimulus: An applied physical trigger—such as light, temperature, magnetic field or ultrasound—used to activate or modulate drug release kinetics in smart carriers.
References
- Endogenous and Exogenous Stimuli-Responsive Drug Delivery Systems for Programmed Site-Specific Release. Molecules (2019).
- Advances in redox-responsive drug delivery systems of tumor microenvironment. Journal of Nanobiotechnology (2018).
- Application and design of esterase-responsive nanoparticles for cancer therapy. Drug Delivery (2019).
- Enzyme-Responsive Nanoparticles for Anti-tumor Drug Delivery. Frontiers in Chemistry (2020).
- Photonic and magnetic materials for on-demand local drug delivery. Advanced Drug Delivery Reviews (2022).
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