What question did this study set out to answer?

The research aims to evaluate how changes in illumination procedures affect pain and treatment success in photodynamic therapy for actinic keratoses.

March 31, 2026Open Access

Consequences of changing illumination procedures in photodynamic therapy

Key Points

The research aims to evaluate how changes in illumination procedures affect pain and treatment success in photodynamic therapy for actinic keratoses.
Comparison of conventional PDT with daylight-mediated PDT
Assessment of pain levels during different illumination times
Analysis of protoporphyrin IX activation under various light conditions
Daylight-mediated PDT significantly reduces pain compared to conventional methods.
Extended incubation periods before illumination increase pain levels.
Shortened illumination durations lead to less activated protoporphyrin IX, potentially reducing treatment effectiveness.

Abstract

Conventional photodynamic therapy (PDT) for actinic keratoses (AK) involves a three-hour accumulation of protoporphyin IX (PpIX) after methyl aminolevulinate (MAL) or 5-aminolevulinic acid (ALA) application, followed by 7-12 minutes of illumination which may elicit severe pain. Daylight-mediated PDT greatly reduces pain by activating PpIX while it forms. Various visible light sources can be used to replicate daylight PDT indoors, with either prolonged incubation time before illumination, or a fixed incubation of 30 min. before illumination. Extended incubation before illumination causes more pain, whereas shortening the illumination duration reduces the amount of activated PpIX which may impair treatment efficacy.

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Wulf et al. (Sun,) studied this question.

synapsesocial.com/papers/69cb645fe6a8c024954b8a6e https://doi.org/https://doi.org/10.1016/j.pdpdt.2026.105457

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