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Fluorescence endoscopy and photodynamic therapy.

H Messmann1, E Endlicher, C M Gelbmann

  • 1Dept of Interna Medicine I, University of Regensburg, Germany. helmut.messmann@klinik.uni-regensburg.de

Digestive and Liver Disease : Official Journal of the Italian Society of Gastroenterology and the Italian Association for the Study of the Liver
|December 10, 2002
PubMed
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Fluorescence endoscopy enhances early cancer detection by utilizing light-induced fluorescence from specialized agents or natural tissue properties. This technique aids in identifying difficult-to-see malignant and premalignant lesions in various organs.

Area of Science:

  • Medical Imaging
  • Gastroenterology
  • Urology

Background:

  • Malignant and premalignant lesions are often difficult to detect with conventional methods.
  • Fluorescence properties of both exogenous sensitisers and endogenous fluorophores differ between normal and diseased tissues.

Purpose of the Study:

  • To review the application of fluorescence endoscopy for improved detection of neoplastic lesions.
  • To discuss the potential of fluorescence-based techniques in diagnosis and therapy.

Main Methods:

  • Utilizing exogenous sensitisers (e.g., 5-aminolaevulinic acid) that accumulate in malignant tissues.
  • Employing fluorescence spectroscopy for optical sampling of mucosal tissue.
  • Generating real-time fluorescence images using specialized camera systems for broad area screening.

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Main Results:

  • Fluorescence endoscopy allows for better detection of non-visible or hard-to-detect malignant/premalignant lesions.
  • The technique is established in urology and shows promise in gastroenterology for conditions like Barrett's oesophagus and ulcerative colitis.
  • Fluorescence imaging enables larger area screening compared to point spectroscopy.

Conclusions:

  • Fluorescence endoscopy is a valuable tool for early cancer detection and diagnosis.
  • Photodynamic therapy using fluorescence-inducing agents offers therapeutic potential for various cancers.
  • Future advancements may involve laser light fractionation or combined sensitiser approaches for enhanced efficacy.