Ontology type: schema:ScholarlyArticle
2000-11
AUTHORSK. Orth, D. Russ, R. Steiner, H.G. Beger
ABSTRACTPhotodynamic therapy (PDT) is a form of cancer treatment based on the selective accumulation of a photosensitizer in neoplastic tissue. The fluorescent properties of a photosensitizer permit diagnostic localization of primary tumours and/or metastasis. Occult lesions are hard to detect and can easily be missed during routine laparoscopy. Fluorescence observation offers additional optical information and the ability to detect these occult tumours. Clinically, we used 5-aminolevulinic acid for peritoneal staining and tumour demarcation via tumour-specific fluorescence induced by protoporphyrin IX. For laparoscopic observations, a "D-Light" system was used; the conventional white light source was equipped with an optical blocking filter that transmits at the excitation wavelength (380-450 nm) and blocks all other parts of the spectrum. With the aid of a suitable observation filter, the relevant fluorescence was detectable. With the help of this fluorescence we increased the capacity to detect occult tumours, that were missed with white-light observation (9/26). In the gastrointestinal tract, we used a krypton laser at 405 nm for PP IX fluorescence induction. Although there were high sensitivity rates for neoplasms (81% peritoneal carcinomas, 60% gastric cancer), no exact histopathological statement could be achieved at because of false-positive fluorescence, mainly caused by inflammation (6/32). Current clinical goals and the future perspectives of photodynamic diagnostic are discussed. More... »
PAGES488-494
http://scigraph.springernature.com/pub.10.1007/s004230000174
DOIhttp://dx.doi.org/10.1007/s004230000174
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