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A Comparison of Dose Metrics to Predict Local Tumor Control for Photofrin‐mediated Photodynamic Therapy
Author(s) -
Qiu Haixia,
Kim Michele M.,
Penjweini Rozhin,
Finlay Jarod C.,
Busch Theresa M.,
Wang Tianhao,
Guo Wensheng,
Cengel Keith A.,
Simone Charles B.,
Glatstein Eli,
Zhu Timothy C.
Publication year - 2017
Publication title -
photochemistry and photobiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.818
H-Index - 131
eISSN - 1751-1097
pISSN - 0031-8655
DOI - 10.1111/php.12719
Subject(s) - photodynamic therapy , fluence , singlet oxygen , photosensitizer , dosimetry , chemistry , nuclear medicine , in vivo , collimated light , fibrosarcoma , oxygen , analytical chemistry (journal) , laser , optics , medicine , photochemistry , physics , chromatography , pathology , biology , microbiology and biotechnology , organic chemistry
This preclinical study examines light fluence, photodynamic therapy ( PDT ) dose and “apparent reacted singlet oxygen,” [ 1 O 2 ] rx , to predict local control rate ( LCR ) for Photofrin‐mediated PDT of radiation‐induced fibrosarcoma ( RIF ) tumors. Mice bearing RIF tumors were treated with in‐air fluences (50–250 J cm −2 ) and in‐air fluence rates (50–150 mW cm −2 ) at Photofrin dosages of 5 and 15 mg kg −1 and a drug‐light interval of 24 h using a 630‐nm, 1‐cm‐diameter collimated laser. A macroscopic model was used to calculate [ 1 O 2 ] rx and PDT dose based on in vivo explicit dosimetry of the drug concentration, light fluence and tissue optical properties. PDT dose and [ 1 O 2 ] rx were defined as a temporal integral of drug concentration and fluence rate, and singlet oxygen concentration consumed divided by the singlet oxygen lifetime, respectively. LCR was stratified for different dose metrics for 74 mice (66 + 8 control). Complete tumor control at 14 days was observed for [ 1 O 2 ] rx ≥ 1.1 m m or PDT dose ≥1200 μ m J cm −2 but cannot be predicted with fluence alone. LCR increases with increasing [ 1 O 2 ] rx and PDT dose but is not well correlated with fluence. Comparing dosimetric quantities, [ 1 O 2 ] rx outperformed both PDT dose and fluence in predicting tumor response and correlating with LCR .