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Targeted Cancer Therapies

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Related Experiment Video

Updated: Jul 6, 2026

An In-House-Built and Light-Emitting-Diode-Based Photodynamic Therapy Device for Enhancing Verteporfin Cytotoxicity in a 2D Cell Culture Model

An In-House-Built and Light-Emitting-Diode-Based Photodynamic Therapy Device for Enhancing Verteporfin Cytotoxicity in a 2D Cell Culture Model

Published on: January 13, 2023

Recent advances in two-photon photodynamic therapy.

Kazuya Ogawa¹, Yoshiaki Kobuke

¹Graduate School of Materials Science, Nara Institute of Science and Technology, 8916-5 Takayama, Ikoma, Nara 630-0101, Japan.

Anti-Cancer Agents in Medicinal Chemistry

|April 9, 2008

Summary

Two-photon absorption (2PA) photodynamic therapy (PDT) offers enhanced cancer treatment selectivity. However, current photosensitizers have low 2PA cross sections, limiting PDT efficiency and requiring further development for clinical success.

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Area of Science:

Oncology
Biomedical Optics
Photochemistry

Background:

Photodynamic therapy (PDT) is an established cancer treatment modality.
Two-photon absorption (2PA) offers potential for spatially selective cancer treatment when integrated with PDT.
Review of existing literature on 2PA-PDT possibilities and limitations.

Purpose of the Study:

To discuss the advantages and disadvantages of using two-photon excitation in PDT.
To review current literature on 2PA-PDT applications in cancer therapy.
To identify key challenges and requirements for advancing 2PA-PDT.

Main Methods:

Literature review of studies investigating two-photon absorption in photodynamic therapy.
Analysis of photosensitizer properties, including 2PA cross-section values.
Comparison of one-photon absorption PDT with two-photon absorption PDT.

Main Results:

Two-photon absorption PDT provides superior spatial selectivity compared to traditional one-photon absorption PDT.
Femtosecond pulsed lasers are more effective for 2PA-PDT than pico- or nanosecond pulses.
Existing photosensitizers exhibit low 2PA cross-section values (<50 GM), leading to suboptimal PDT efficiency.

Conclusions:

2PA-PDT demonstrates significant potential for precise cancer treatment due to enhanced selectivity.
The efficiency of 2PA-PDT is currently limited by the low 2PA cross sections of available photosensitizers.
Development of photosensitizers with substantially larger 2PA cross sections is crucial for realizing the full clinical potential of 2PA-PDT.