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AIM: To compare the therapeutic efficacy of calcipotriol-PUVA therapy and PUVA in Korean patients with psoriasis. METHODS: A total of 38 patients were treated with conventional PUVA and 37 with calcipotriol PUVA. A comparison was made between the total number of PUVA treatments and the total UVA dose required to reach clearance in the two groups. Thereafter, categorization into clearing, improvement and failure was undertaken, with measurement of the psoriasis area and severity index made at each visit. RESULTS: Cumulative UVA dose as well as the number and duration of treatments in the calcipotriol-PUVA group were significantly lower than in the PUVA-treated group. Some 86% of patients treated with calcipotriol-PUVA showed clearing compared with 66% of those treated by PUVA. In the calcipotriol-PUVA group, the patients with only moderate extent required fewer irradiation treatments, shorter durations of treatment, and a lower final and cumulative UVA dose to reach clearance than the severely affected group. CONCLUSION: Combining PUVA with calcipotriol in the treatment of psoriasis may reduce the risks of long-term UV radiation and improve the clinical response. (J Dermatol Treat (2000) 11:125-130). [ABSTRACT FROM AUTHOR]