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31 January 1996 Interspecies pharmacokinetics as applied to the hard drug photosensitizing agent meta(tetrahydroxphenyl)chlorin
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Having successfully completed an extensive three year study of the pharmacokinetics and efficacy of m-THPC as a photosensitizer in three different animal models (rabbit, dog and nude rats) we began a phase one human trial in two centers. At the Orebro Medical Center Hospital, Sweden ten patients were selected for the treatment of bronchial, prostate, skin, laryngeal and nasopharyngeal tumors while at Long Island Jewish Medical Center Hospital four patients were treated for laryngeal cancers. These studies were designed to study the optimal parameters for human treatment and as such relied on data from the animal studies mentioned above. De-escalating drug doses of 0.3, 0.15, 0.075 and 0.0375 mg/kg were chosen and the pharmacokinetics of the patients plasma, tumor and adjacent healthy tissues were measured spectrofluorometrically following chemical extraction of the drug. The half life of the drug in our Cotton tail rabbit model was measured as 24.7 hours as opposed to the human half life of 44.5 hours within the studied dosing range. This illustrates the extreme care that must be exercised before translating animal pharmacokinetics data to human dosing decision.
© (1996) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Avigdor M. Ronn, Lennart A. Lofgren M.D., and Anders Westerborn "Interspecies pharmacokinetics as applied to the hard drug photosensitizing agent meta(tetrahydroxphenyl)chlorin", Proc. SPIE 2625, Photochemotherapy: Photodynamic Therapy and Other Modalities, (31 January 1996);

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