title: Photodynamic ablation of high-grade dysplasia and early cancer in Barrett's esophagus by means of 5-aminolevulinic acid.
abstract: OBJECTIVE
  The first therapeutic experiences with the conventional photosensitizer dihematoporphyrinester in the treatment of Barrett's esophagus show the curative potential of photodynamic therapy (PDT). The aim of this study was to test 5-aminolevulinic acid (5-ALA)-induced protoporphyrin IX, a photosensitizer with a high mucosa specificity without phototoxic side effects on the skin, as a new form of PDT.
  
  
  METHODS
  Thirty-two patients (mean age, 68.5 years) with histologically proven high-grade dysplasia (n = 10) and mucosal cancer (n = 22) in Barrett's esophagus were treated. Four to 6 hours after oral ingestion of 5-ALA (dose, 60 mg/kg body wt), irradiation was conducted with a dye laser system (635 nm) with a light dose of 150 J/cm2. The patients received 20-80 mg omeprazole daily after PDT.
  
  
  RESULTS
  High-grade dysplasia was eradicated in all patients (10 of 10), and mucosal cancer was eliminated in 17 of 22 patients (77%) at a mean follow-up of 9.9 months (range, 1-30 months). All tumors < or = 2 mm in thickness were completely ablated (17 of 17). The method-related mortality and morbidity was 0%.
  
  
  CONCLUSIONS
  Severe dysplasia and thin (< or = 2 mm) mucosal cancer of Barrett's esophagus can be completely ablated. PDT might offer a minimally invasive treatment modality as an alternative to esophagectomy.
authors.affiliation: Department of Medicine II, Klinikum der Landeshauptstadt Wiesbaden, Germany.
authors.forename: L
authors.initials: L
authors.lastname: Gossner
authors.forename: M
authors.initials: M
authors.lastname: Stolte
authors.forename: R
authors.initials: R
authors.lastname: Sroka
authors.forename: K
authors.initials: K
authors.lastname: Rick
authors.forename: A
authors.initials: A
authors.lastname: May
authors.forename: E G
authors.initials: EG
authors.lastname: Hahn
authors.forename: C
authors.initials: C
authors.lastname: Ell
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000622:Aminolevulinic Acid / Q000493:pharmacokinetics / Q000627:therapeutic use*; D001471:Barrett Esophagus / Q000188:drug therapy* / Q000473:pathology; D004938:Esophageal Neoplasms / Q000188:drug therapy* / Q000473:pathology; D005260:Female; D005453:Fluorescence; D006801:Humans; D008297:Male; D008875:Middle Aged; D010778:Photochemotherapy; D011230:Precancerous Conditions / Q000188:drug therapy* / Q000473:pathology
chemical_list: D000622:Aminolevulinic Acid