[Use of biologicals in psoriasis].
With a prevalence of 2-3 percent, psoriasis is one of the most common diseases in dermatology. Most patients can be treated sufficiently with topical emollients, but approximately 20 percent of all patients suffering from psoriasis need photo- and/or systemic therapies. Side effects, contraindications, insufficient clinical responses, and lack of long-term efficacy underline the need for novel and improved antipsoriatic therapies. Several biologics interfering with key steps in the immunopathogenesis of psoriasis bear the potential to meet this need with regard to treating moderate to severe psoriasis. Progress made in the understanding of the pathophysiology of psoriasis as T-cell mediated dermatosis does provide options for new, more precise therapeutic approaches. These immunological therapeutic strategies are targeted at the inhibition of T-cell activation, the depletion of activated T-lymphocytes, the inhibition of adhesion of inflammatory cells, the inhibition of effects of proinflammatory cytokines and the application of antiinflammatory cytokines. This article gives a summary of new biologicals used in the treatment of psoriasis. Clinical results received from first applications are inconclusive. Further results of the studies from phase II and phase III can be expected in the next few years, which should make it possible to achieve better assessments of the potential of these types of treatments. Some of these approaches could lead to the approval of new drugs to treat psoriasis and to enhance or replace already existing therapeutic options.