Rationale for use and clinical responsiveness of hexafluoro-1,25-dihydroxyvitamin D3 for the treatment of plaque psoriasis: a pilot study.

BACKGROUND

Vitamin D analogues are useful in topical therapy of psoriasis.

OBJECTIVES

To evaluate the effect of hexafluoro-1,25-dihydroxyvitamin D3 (F6-1,25(OH)2D3) in treatment of psoriasis.

METHODS

Fifteen patients with plaque-type psoriasis were enrolled in a single centre double-blind, right/left comparison, placebo-controlled study, and received 0.1 g of petrolatum containing 5 microg of F6-1,25(OH)2D3 or 0.1 g of petrolatum (placebo) for 3 months. After completion of this double-blind study, a subset of these patients (n = 12) applied F6-1,25(OH)2D3 ointment (50 microg g-1 of petrolatum) to all their lesions (total area, 100-5000 cm2, mean area: 3300 m2) for 2 months as a single application at night.

RESULTS

The mean severity score in the right/left-sided controlled topical F6-1,25(OH)2D3 (50 microg g-1) therapy group showed a decrease of 85%. In contrast, the mean severity score for the placebo-treated areas showed a decrease of 45% (P < 0.001). In the 12 patients who subsequently applied F6-1,25(OH)2D3 (50 microg g-1) ointment to all of their lesions, 91.6% showed moderate to excellent improvement. The mean Psoriasis Area and Severity Index score decreased by 44.9% (from 33.6 +/- 15 to 18.5 +/- 13). No effect on calcium homeostasis was noted. Adverse events included mild irritation in two patients that resolved during therapy.

CONCLUSIONS

Topical F6-1,25(OH)2D3 is a safe and effective once a day treatment for psoriasis.