title: Fluorescence diagnosis and photodynamic therapy for Bowen's disease treatment.
abstract: BACKGROUND
  It has already been demonstrated the high efficacy of photodynamic therapy (PDT) for Bowen's disease (BD) treatment. Fluorescence diagnosis consists on registration of the fluorescence emitted by tissue after application of a photosensitizer, indicating presence of tumoral cells. It has been described as a useful tool for actinic keratosis. Different results have been published about fluorescence diagnosis for basal cell carcinomas. Very few reports about the role of fluorescence diagnosis for this entity exist and this is the first one which correlates the fluorescence image after PDT with the histopathological response.
  
  
  OBJECTIVE
  To assess the role of fluorescence diagnosis during BD follow-up.
  
  
  METHODS
  We carried out an observational, retrospective and descriptive study. A total of 29 BD biopsy proven lesions were included. All the lesions had been treated with the standard protocol (Topical methyl- aminolaevulinic acid under occlusion for 3 hours and followed by illumination with red-light (630 nm, 38 J/cm(2), 7.5 minutes. Two sessions one week apart). Clinical and fluorescence photographs were taken before treatment and one month after the 2(nd) one. At that moment a post-treatment biopsy was performed. Clinical response was classified as partial, complete or no response. Fluorescence response was classified as negative, intermediate or intense. The follow-up period and the adverse events observed including pain were also collected.
  
  
  RESULTS
  We found statistical association between fluorescence and the clinical and histopathological evaluations performed after treatment. Fluorescence diagnosis obtained a 100% sensitivity (higher than clinical evaluation alone) and a specificity of 85.7% (CI: 70.8-100).
  
  
  CONCLUSIONS
  Fluorescence diagnosis seems a valid diagnostic tool, useful during the follow up of Bowen disease lesions with the advantage of avoiding unnecessary post-treatment biopsies.
authors: Dermatology department at University Hospital, Ramón y Cajal Hospital, Madrid, SpainDermatopathology department in University Hospital, Ramón y Cajal Hospital, Madrid, Spain.
authors: M T
authors: MT
authors: Truchuelo
authors: B
authors: B
authors: Pérez
authors: M
authors: M
authors: Fernández-Guarino
authors: C
authors: C
authors: Moreno
authors: P
authors: P
authors: Jaén-Olasolo
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D000622:Aminolevulinic Acid / Q000008:administration & dosage / Q000031:analogs & derivatives / Q000627:therapeutic use; D001913:Bowen's Disease / Q000175:diagnosis* / Q000188:drug therapy*; D005260:Female; D005453:Fluorescence; D006801:Humans; D008297:Male; D008875:Middle Aged; D010778:Photochemotherapy; D017319:Photosensitizing Agents / Q000008:administration & dosage / Q000627:therapeutic use
chemical_list: D017319:Photosensitizing Agents; C475457:methyl 5-aminolevulinate; D000622:Aminolevulinic Acid