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September 5, 2025Open Access

Myth or Reality: Is Hypoxia Really a Problem in Photodynamic Therapy?

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Authors

YZYiyi ZhangChimie ParisTechZCZhenhua ChenChimie ParisTechTFTao FengSun Yat-sen University

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Overview

Observational analysis demonstrates similar IC50 values for photodynamic therapy in hypoxic and normoxic conditions, suggesting a reevaluation of hypoxia's role.

Key Points

  • IC50 values for photodynamic therapy showed no significant differences between hypoxic and normoxic conditions, challenging established assumptions.
  • The study tested five clinically approved photosensitizers, revealing that only Rose Bengal differentiated in its hypoxic response.
  • Independent validation confirmed findings, indicating possible non-oxygen dependent mechanisms such as photoredox catalysis in photodynamic therapy.
  • The results prompt a reevaluation of the necessity of oxygen in photodynamic therapy and the underlying mechanisms involved.

Cite This Study

Zhang et al. (2025) studied this question.

synapsesocial.com/papers/68bb3ef72b87ece8dc9579f5https://doi.org/10.26434/chemrxiv-2025-38kth
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  1. 1Assessing photodynamic therapy under in vitro hypoxia: photochemical pathways and methodological challenges2026
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  5. 5Molecular Engineering of Pure Superoxide Radical Photogenerator for Hypoxia‐Tolerant Tumor Theranostics2024 · 11 citations