Targeted photodynamic therapy--a promising strategy of tumor treatment

Area of Science:

• Oncology
• Biomedical Engineering
• Photochemistry

Background:

• Drug toxicity and resistance are significant challenges in contemporary cancer therapy.
• Photodynamic therapy (PDT) offers a promising approach but faces limitations in photosensitizer delivery and specificity.
• Targeted photodynamic therapy (TPDT) aims to improve PDT efficacy by enhancing targeted delivery of photosensitizers to cancer tissues.

Purpose of the Study:

• To review contemporary strategies in targeted photodynamic therapy (TPDT).
• To highlight innovative concepts and emerging modalities within TPDT.
• To discuss the need for a new paradigm in PDT considering tumor heterogeneity and dynamics.

Main Methods:

• Review of current literature on targeted photodynamic therapy strategies.
• Categorization of TPDT approaches based on targeting mechanisms (passive, active, activatable).
• Exploration of novel targeting agents like peptides, aptamers, and nanoplatforms.

Main Results:

• TPDT strategies are classified into passive, active, and activatable approaches.
• Innovative TPDT concepts include peptide/aptamer-assisted targeting, magnetic field-navigated nanoplatforms, and enzyme-activatable "photodynamic molecular beacons."
• These advanced strategies aim to improve photosensitizer accumulation and activation specifically within tumor sites.

Conclusions:

• Targeted photodynamic therapy represents a significant advancement over traditional PDT.
• Emerging TPDT strategies offer enhanced specificity and efficiency, addressing limitations of conventional treatments.
• A paradigm shift in PDT, incorporating tumor heterogeneity and dynamic characteristics, is crucial for future development.