Janssen-Cilag International NV announced the submission of a Marketing Authorisation Application to the European Medicines Agency (EMA) seeking approval of guselkumab for the treatment of adults living with moderate to severe plaque psoriasis. Guselkumab is a human monoclonal antibody that targets the protein interleukin (IL)-23, which has been shown to play a key role in the development of immune-mediated inflammatory diseases.