title: [The Koebner phenomenon, a prognostic sign of PUVA therapy effectiveness in patients with psoriasis vulgaris--yes or no?].
abstract: BACKGROUND
  Former investigations of Koebner phenomenon had demonstrated its higher incidence in patients with severe generalized and/or unstable forms of psoriasis which expressed increased resistance to various treatment modalities. The aim of this study was to establish the correlation between the presence of Koebner phenomenon and the PUVA therapy effects, total number of PUVA treatments, total dose of UVA radiation and the duration of remission after PUVA therapy discontinuation.
  
  
  METHODS
  Sixty patients with severe clinical picture of psoriasis vulgaris, treated with PUVA therapy, were included in this research. According to the presence of Koebner phenomenon they were divided into two groups, 20 patients with positive and 40 patients with negative Koebner reaction, who were the control group at the same time.
  
  
  CONCLUSIONS
  95% of patients treated with PUVA, were cleared of psoriatic changes in the Koebner positive, as well as in the Koebner negative group. There were also no differences between the Koebner positive and Koebner negative group in the mean number of PUVA treatments, mean total dose and the last dose of UVA radiation, which led up to the clinical remission of psoriasis. Our results of investigation have demonstrated increased relapse of psoriasis, during the first 6 months after cessation of PUVA therapy, in the Koebner positive group, with a high statistical significance (p < 0.001), comparing with Koebner negative group in the same period. Furthermore, the tendency of relapse of Koebner positive and Koebner negative psoriatic patients was higher in Koebner positive group even in the first 3 months after PUVA therapy.
  
  
  CONCLUSIONS
  PUVA therapy effects, total number of PUVA treatments, total dose of UVA radiation didn't depend on presence of Koebner phenomenon. However, Koebner phenomenon was a mark of high relapsing tendency of psoriasis in the first 6 months after PUVA therapy cessation.
authors.affiliation: Klinicki centar, Medicinski fakultet, Novi Sad.
authors.forename: L
authors.initials: L
authors.lastname: Matović
authors.forename: M
authors.initials: M
authors.lastname: Poljacki
authors.forename: V
authors.initials: V
authors.lastname: Duran
authors.forename: S
authors.initials: S
authors.lastname: Stojanović
authors.forename: M
authors.initials: M
authors.lastname: Subotić
mesh_terms: D006801:Humans; D011701:PUVA Therapy; D011379:Prognosis; D011565:Psoriasis / Q000188:drug therapy* / Q000473:pathology; D012008:Recurrence; D012867:Skin / Q000473:pathology / Q000528:radiation effects; D016896:Treatment Outcome