Singlet oxygen (1O2), a type of reactive oxygen species, destroys cancer cells during photodynamic therapy (PDT). Inter-patient variations in tissue oxygen levels, dose of photosensitizer (PS), and fluence of light can affect 1O2 generation and result in suboptimal treatment efficacy in the clinic. Here, we describe a high throughput spectrometer system based on computational spectroscopy for real-time measurement of PS levels and 1O2 luminescence during PDT. The dosimeter provides a direct real-time measurement of 1O2 production in continuous-wave mode. Data were obtained from in-vitro protoporphyrin IX (PpIX) phantoms, and from in-vivo studies in mice with actinic keratosis (AK, an early form of squamous cell carcinoma) using the dosimeter. Data indicated a correlation between 1O2 levels and treatment outcome (lesion shrinkage/clearance). This study provides additional evidence for a correlation between 1O2 generation and AK treatment response, suggesting that 1O2 dosimetry could have utility in the dermatology clinic.
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Anand et al. (2024) studied this question.
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