PMID: 8600419Mar 1, 1996Paper

Liposomal benzoporphyrin derivative verteporfin photodynamic therapy. Selective treatment of choroidal neovascularization in monkeys

Ophthalmology
M KramerE S Gragoudas

Abstract

The authors have previously shown that photodynamic therapy (PDT) using lipoprotein-delivered benzoporphyrin derivative mono-acid (BPD) effectively closed experimental choroidal neovascularization (CNV). In the current study, the authors used a clinical preparation, liposomal BPD verteporfin in the same model, with experiments designed to establish optimal dye and light doses, and the timing of laser light irradiation after dye injection, for effective and selective closure of CNV. Experimental CNV was induced in the maculae of cynomolgus monkeys. Liposomal BPD verteporfin was injected intravenously at doses of 1.0, 0.5, 0.375, and 0.25 mg/kg. Laser light at 692 nm then was applied to CNV, with an irradiance of 600 mW/cm2 and fluence of 150 J/cm2, at various times after dye injection, ranging from 5 to 120 minutes. Treatment effect was assessed by fundus photography and fluorescein angiography and confirmed by light and electron microscopy. The PDT of experimental CNV was studied to assess efficacy; PDT performance on normal eyes was studied to investigate selectivity. The CNV closure was demonstrated by fluorescein angiography and histopathologic findings at all tested dye doses. A dye dose of 0.375 mg/kg, with laser light irr...Continue Reading

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