title: Treatment of Darier's disease with photodynamic therapy.
abstract: BACKGROUND
  Photodynamic therapy (PDT) using topical 5-aminolaevulinic acid (5-ALA) as a photosensitizer has been reported in the treatment of both neoplastic and benign cutaneous disorders.
  
  
  OBJECTIVE
  To evaluate the efficacy of photodynamic therapy in selected patients with Darier's disease (keratosis follicularis).
  
  
  METHODS
  Six patients with Darier's disease were assessed before and after treatment with PDT using 5-ALA and mean fluence rates of 110-150 mW cm-2.
  
  
  RESULTS
  Of the six patients, one was unable to tolerate the treatment. Of the remaining five, all experienced an initial inflammatory response that lasted two to three weeks. In four of the five patients, this was followed by sustained clearance or improvement over a followup period of six months to three years. Three of these four patients were on systemic retinoids and the fourth had discontinued acitretin prior to PDT. In the fifth patient partial improvement was followed by recurrence after etretinate therapy was discontinued. Biopsy specimens taken immediately after the procedure in two patients demonstrated a mild inflammatory cell infiltrate in the dermis. A biopsy obtained eighteen months after PDT from a successfully treated area showed no signs of Darier's disease and a subtle increase of collagen in the upper dermis.
  
  
  CONCLUSIONS
  Photodynamic therapy can be viewed as a potential adjunctive modality for Darier's disease but should not be considered as a substitute for retinoids in patients who require systemic treatment.
mesh_terms: D000328:Adult; D000368:Aged; D000622:Aminolevulinic Acid / Q000627:therapeutic use*; D007644:Darier Disease / Q000188:drug therapy*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D010778:Photochemotherapy / Q000379:methods*; D017319:Photosensitizing Agents / Q000627:therapeutic use*; D016896:Treatment Outcome
chemical_list: D017319:Photosensitizing Agents; D000622:Aminolevulinic Acid