Narrowband UV-B phototherapy vs photochemotherapy in the treatment of chronic plaque-type psoriasis: a paired comparison study.

Abstract

To compare the therapeutic efficacy of narrowband (TL-01) UV-B phototherapy vs photochemotherapy (psoralen-UV-A [PUVA]) in patients with chronic plaque-type psoriasis. Open, nonrandomized, intraindividually controlled paired comparison study. Phototherapeutic unit in a university hospital. Twenty-five patients with chronic plaque-type psoriasis. Paired irradiations with threshold erythemogenic doses of narrowband UV-B and PUVA were given to the patients' dorsal aspect including the arms and legs. Treatment was performed 3 times weekly until complete or almost complete clearing with one or both regimens or over a maximum period of 18 exposures. Assessment of the Psoriasis Area and Severity Index (PASI) in each half of the patient's dorsal aspect before and after treatment with the 2 regimens. The median pretreatment PASI score of 16 (range, 6.2-23.4) was reduced by 84% to 2.5 (range, 0-12.6) by the narrowband UV-B treatment and by 89% to 1.8 (range, 0-8.2) by the PUVA treatment. Statistical analysis of these data showed a tendency for PUVA being superior to narrowband UV-B although the difference remained below the level of significance (P = .17). However, a clear effect of the pretreatment PASI score on the therapeutic outcome was found. Patients with higher baseline PASI scores responded significantly better to PUVA than to narrowband UV-B (P = .03). Our data demonstrate that in many patients with plaque-type psoriasis, narrowband UV-B is comparably as effective as PUVA and, given the lack of photosensitizer-related adverse reactions and the possibly lower long-term cancer risk, can be considered as first-line treatment. Treatment with PUVA, on the other hand, remains the mainstay for patients with high PASI scores who do not respond or whose psoriasis cannot be controlled adequately by narrowband UV-B.