In the past three decades, major advances have been made in understanding the pathogenesis of psoriasis. This review focuses on the role of IL-23 in psoriasis pathogenesis and the current therapies targeting IL-23 that are being studied in clinical trials.
Biologic compounds are being used more frequently to treat a multitude of systemic inflammatory conditions. This article discusses the increased risk of opportunistic infections of tuberculosis, herpes zoster, Legionella pneumophila, and Listeria monocytogenes.