International studies of the efficacy of etretinate in the treatment of psoriasis.

International studies evaluating the efficacy of etretinate (Ro 10-9359) in psoriatic patients are reviewed. Double-blind, placebo controlled studies uniformly have demonstrated the therapeutic effect of the retinoid. Both single therapy and combination therapy studies confirm the efficacy of this new form of treatment, especially in patients with the rarer and more severe forms of psoriasis.