Novel systemic drugs under investigation for the treatment of psoriasis.

In the last few years, there has been progress in identifying some of the risk genes for psoriasis. This has resulted in a major impetus toward drug development as many of the same pathways and processes identified in psoriasis have been shown to have major roles in other chronic inflammatory diseases, suggesting that psoriasis can be used as a treatment model for many other diseases. This has resulted in a shift in research toward a select number of biological processes and has been accompanied by a surge in drug development with over 20 systemic agents currently in clinical testing for psoriasis, many of which target the pathways identified through genetic and basic research. Although it is too early to tell for many of these agents how effective and safe they will be, and where they will fit into treatment algorithms, it is evident that our range of options in treating this often perplexing disease will greatly increase in the future.