Photodynamic therapy using Verteporfin (benzoporphyrin derivative monoacid ring A, BPD-MA) and 630 nm laser light in canine esophagus

• Published in: Lasers in surgery and medicine Vol. 30; no. 1; pp. 26 - 30
• Main Authors: Panjehpour, Masoud, DeNovo, Robert C., Petersen, Mark G., Overholt, Bergein F., Bower, Robert, Rubinchik, Valery, Kelly, Barbara
• Format: Journal Article
• Language: English
• Published: New York John Wiley & Sons, Inc 01.01.2002; Wiley-Liss
• Subjects: Animals; Barrett's esophagus; Biological and medical sciences; Dogs; esophageal PDT balloon; Esophagoscopy; Esophagus - drug effects; Esophagus - pathology; KTP/Dye laser; Laser Therapy; Medical sciences; Mucous Membrane - drug effects; Mucous Membrane - pathology; Photochemotherapy; photodynamic therapy; photosensitizer; Photosensitizing Agents - pharmacokinetics; Photosensitizing Agents - therapeutic use; Porphyrins - pharmacokinetics; Porphyrins - therapeutic use; Radiotherapy. Instrumental treatment. Physiotherapy. Reeducation. Rehabilitation, orthophony, crenotherapy. Diet therapy and various other treatments (general aspects); Technology. Biomaterials. Equipments. Material. Instrumentation; Fissipedia; Carnivora; Photodynamic therapy; Digestive system; Mucosa; Instrumentation therapy; Laser irradiation; Experimental study; Ablation; Esophagus; Vertebrata; Mammalia; Surgery; Animal; Verteporfin; Effective dose; Dog; Photosensitizer
• ISSN: 0196-8092; 1096-9101
• DOI: 10.1002/lsm.10014

Background and Objective Verteporfin is a new photosensitizer with short‐term skin photosensitivity. The objective of this preclinical study was to find the light dose that effectively ablates canine esophageal mucosa when delivered 30 minutes after Verteporfin injection. Study Design/Materials and Methods Verteporfin was administered intravenously (0.75 mg/kg). 630 nm light from KTP/Dye laser was delivered using an esophageal Photodynamic therapy (PDT) balloon. In Phase I study, animals were treated 30 minutes after drug injection using 40, 60, and 80 J/cm to find the desired light dose. Using results from phase I and application of reciprocity principle (light dose vs. plasma concentration of drug), additional light doses were calculated for delivery at other times. In phase II, animals were treated at 15, 60, and 120 minutes, using the calculated light doses of 60, 145, and 200 J/cm, respectively. Animals were followed for 2 days to 4 weeks. Results In Phase I, 80 J/cm at 30 minutes induced total mucosal ablation. In Phase II, light doses of 60, 145, and 200 J/cm induced similar mucosal injuries when delivered at 15, 60, and 120 minutes, respectively. Conclusions Effective mucosal ablation in canine esophagus was achieved using Verteporfin and 630 nm light doses of 60, 80, 145, and 200 J/cm when delivered at 15, 30, 60, and 120 minutes after the drug injection, respectively. Lasers Surg. Med. 30:26–30, 2002. © 2002 Wiley‐Liss, Inc.