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  • 1
    ISSN: 1433-0385
    Keywords: Key words: Barrett's oesophagus ; Oesophageal carcinoma ; PDT ; 5-ALA ; Argon-plasma coagulation. ; Schlüsselwörter: Barrett-Oesophagus ; Oesophaguscarcinom ; photodynamische Therapie ; Argon-Plasmacoagulation.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung. Elf Patienten mit schweren dysplastischen Mucosaveränderungen bei Endobrachyoesophagus und 2 Patienten mit einem Plattenepithelcarcinom (uT1) wurden mit photodynamischer Therapie (PDT) und Argon-Plasmacoagulation behandelt. Für die PDT wurde 5-Aminolävulinsäure (5-ALA) oral (60 mg/kg) appliziert und 4–6 Std später endoskopisch mit einer Lichtdosis von 150 J/cm2 (100 mW/cm2) bei 635 nm therapiert. Eine zweite PDT wurde nach 2–3 Wochen unter gleichen Bedingungen durchgeführt. Patienten mit Argon-Plasmacoagulation mußten im Mittel 4mal (2–10) behandelt werden, um eine totale Ablation der Barrett-Mucosa zu erreichen. Alle Patienten wurden konsekutiv einer medikamentösen Säuresuppression zugeführt. Komplikationen traten in beiden Gruppen nicht auf. Kontrolluntersuchungen und multiple Biopsien in der Nachbeobachtung zeigten über 3–42 Monate bei allen 11 Patienten eine Regeneration des Plattenepithels im Endobrachyoesophagus. Bei 2 Patienten mit Plattenepithelcarcinom konnte nach primärer lokaler Tumorzerstörung ein Rezidiv nach 9 und 12 Monaten nachgewiesen werden. Sowohl die PDT mit 5-ALA-induzierter endogener Porphyrie als auch die Argon-Plasmacoagulation können unter Omeprazol-Schutz oberflächige hochgradig dysplastische Schleimhaut bei Barrett-Oesophagus zerstören. Die kurative Zerstörung eines bereits manifesten Carcinoms gelang uns nicht.
    Notes: Summary. Eleven patients with high-grade mucosal dysplasia in a columnar-lined oesophagus and 2 patients with a squamous carcinoma (uT1) underwent photodynamic therapy (PDT) and argon-plasma coagulation (APC). For PDT, 5-aminolevulinic acid (5-ALA) was given orally (60 mg/kg) and treated endoscopically with a light dose of 150 J/cm2 (100 mW/cm2) at 635 nm 4–6 h later. A second PDT was performed under the same conditions 2–3 weeks later. Patients who received APC were treated 4 times on average to reach radical Barrett mucosa eradication. All patients were consistently given medication to suppress acid production. No complications occurred in either group. Follow-up endoscopies and multiple biopsies for 3–42 months showed squamous regeneration in the dysplastic columnar-lined oesophagus in all 11 patients. Two patients with squamous carcinoma were found to have a recurrence 9 and 12 months later. PDT with 5-ALA-induced endogenous porphyrins, as well as APC combined with omeprazole protection, can eradicate superficial high-grade dysplastic mucosa in Barrett's oesophagus. However, we did not succeed in destroying a manifest carcinoma.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Journal of cancer research and clinical oncology 120 (1994), S. 657-661 
    ISSN: 1432-1335
    Keywords: Photodynamic therapy ; Fluorescence ; 5-ALA ; Experimental colonic tumour
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract 5-Aminolevulinic acid (5-ALA) is a precursor in the biosynthesis of haem. External application of 5-ALA leads to the formation of protoporphyrin IX, the last intermediate product before haem, which is an effective sensitiser. The 5-ALA-induced endogenous photosensitisation of tumour cells has been exploited for photodynamic therapy (PDT). Experimental human G-3 colonic tumours were transplanted into nude mice, and ten mice were treated by PDT. Ten animals served as controls. We measured a fluorescence intensity of the tumour that was about eight times higher than in the surrounding tissue; a good correlation between the fluorescence intensity and the photodynamic effect was found. Tumour growth was inhibited significantly after PDT, two tumours being destroyed completely after the second PDT treatment. In addition, on-line fluorescence detection during PDT showed a change in the intensity and the fluorescence spectrum of protoporphyrin IX caused by photobleaching and the formation of photoproducts.
    Type of Medium: Electronic Resource
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