**2. Retrospective study**

### **2.1 Patients and methods**

This is a retrospective study. We revised the list of patients affected with moderate and severe psoriasis and treated with infliximab in our Department since April 2006. Only the first 50 patients were kept, in order to ensure a sufficient trial and analysis period (one year minimum). Four patients were excluded, who were initially treated in the Department but subsequently received follow-up in another hospital. 46 patient files were analyzable in total. Of these, the PASI follow-up data were complete for 41 patients. Analysis of the files was carried out respecting privacy laws, according to the procedures in force for retrospective analyses.

### **2.2 Results**

