Broadband ultraviolet A in the treatment of psoriasis vulgaris: a randomized controlled trial

Broadband ultraviolet A (BB-UVA) has been successfully used in the treatment of scleroderma, a UVA1-responsive dermatosis.

To compare the efficacy of BB-UVA versus psoralen + UVA (PUVA) in psoriasis treatment and assess apoptosis as an effector mechanism.

This randomized controlled trial included 61 patients with chronic plaque psoriasis randomly divided into group I or II. Group I were further randomized to either IA or IB who received UVA 10 or 15 J/cm(2) per session, respectively, while group II received PUVA. Therapy was delivered thrice weekly until clearance or 48 treatments at most. The primary outcome measured was clearance of psoriasis. Dermal lymphocytic counts and bcl-2 expression were measured in 20 patients from each group.

Final Psoriasis Area Severity Index scores were reduced within each group. The UVA group achieved results comparable to PUVA until session 24 but failed to match it at final evaluation, with significantly better clinical, immunohistochemical, and histopathological results achieved by PUVA (P ≤ 0.05). Both modalities caused a reduction in dermal lymphocytic counts and epidermal bcl-2 expression.

BB-UVA appears to be safe and acceptable for the treatment of chronic plaque psoriasis possibly through bcl-2-mediated apoptosis of keratinocytes and epidermal lymphocytes.