title: Randomized double-blind trial of the treatment of chronic plaque psoriasis: efficacy of psoralen-UV-A therapy vs narrowband UV-B therapy.
abstract: OBJECTIVE
  To compare the efficacy of oral psoralen-UV-A (PUVA) therapy with that of narrowband UV-B (NB-UVB) therapy in patients with chronic plaque psoriasis.
  
  
  METHODS
  Double-blind randomized study.
  
  
  METHODS
  Phototherapy unit in a university hospital. Patients Ninety-three patients with chronic plaque psoriasis. Interventions Twice-weekly NB-UVB or PUVA therapy, starting at 70% of the minimum phototoxic or erythema dose, with 20% incremental increases. Patients were treated until clearance, up to a maximum of 30 sessions; those with clearance were followed up until relapse or for 12 months.
  
  
  METHODS
  Proportion of patients achieving clearance, number of treatments to clearance, and, among those with clearance, the proportion remaining in remission at 6 months.
  
  
  RESULTS
  Patients with skin types V and VI had a lower rate of clearance than those with skin types I through IV (24% vs 75%; P = .001). In patients with skin types I through IV, PUVA was significantly more effective than NB-UVB at achieving clearance (84% vs 65%; P = .02). The median number of treatments to clearance was significantly lower in the PUVA group (17.0 vs 28.5; P<.001). More patients treated with PUVA vs NB-UVB were reported to have erythema at some stage during treatment (49% vs 22%; P = .004), although this difference may have been due to ascertainment bias. Six months after the cessation of therapy, 68% of PUVA-treated patients were still in remission vs 35% of NB-UVB-treated patients. Conclusion Compared with NB-UVB, PUVA achieves clearance in more patients with fewer treatment sessions and results in longer remissions.
authors.affiliation: Photobiology Unit, St John's Institute of Dermatology, Division of Genetics and Molecular Medicine, GKT School of Medicine, King's College London, London, England. yones5@yahoo.com
authors.forename: Sami S
authors.initials: SS
authors.lastname: Yones
authors.forename: Roy A
authors.initials: RA
authors.lastname: Palmer
authors.forename: Trish T
authors.initials: TT
authors.lastname: Garibaldinos
authors.forename: John L M
authors.initials: JL
authors.lastname: Hawk
mesh_terms: D000284:Administration, Oral; D000293:Adolescent; D000328:Adult; D000368:Aged; D002908:Chronic Disease; D004311:Double-Blind Method; D005260:Female; D005363:Ficusin / Q000008:administration & dosage*; D006801:Humans; D008297:Male; D008875:Middle Aged; D011701:PUVA Therapy; D017319:Photosensitizing Agents / Q000008:administration & dosage*; D011565:Psoriasis / Q000188:drug therapy* / Q000473:pathology / Q000532:radiotherapy*; D012008:Recurrence; D012720:Severity of Illness Index; D016896:Treatment Outcome; D014466:Ultraviolet Rays; D014467:Ultraviolet Therapy
chemical_list: D017319:Photosensitizing Agents; D005363:Ficusin