Treatment of pyoderma gangrenosum with infliximab in Crohn's disease.

Pyoderma gangrenosum (PG) is an ulcerating noninfectious disease of the skin seen in 1 to 5% of patients with inflammatory bowel disease. The pathogenesis of PG has yet to be determined but may be related to abnormal T cell responses and the production of TNF-alpha, a powerful proinflammatory cytokine. Infliximab, a chimeric monoclonal antibody to TNF-alpha, has been approved for the treatment of Crohn's disease. We present four patients with PG treated with Infliximab for fistulizing Crohn's in whom complete healing of PG was achieved. Four patients with active fistulizing Crohn's disease and PG were treated. All patients were females ranging in age from 48 to 60 years, with a mean age of 54 years. Three of four patients had PG lesions located on the lower extremities; one patient had peristomal disease. All patients had at least colonic involvement of their Crohn's. The patients received either a single infusion or a series of three 5 mg/kg Infliximab infusions. All four patients demonstrated rapid healing of PG within 4 weeks of the first infusion of Infliximab. PG healing followed improvement in bowel disease. Complete resolution without recurrence was noted in all patients. Rapid resolution of PG was noted in four female patients with fistulizing Crohn's disease treated with Infliximab. Healing was complete, without recurrence. The anti-TNF-alpha properties of Infliximab suggest that healing may be mediated by the drug's effect on cytokine pathways, perhaps by blunted T cell activation early in the inflammatory cascade. We suggest an independent effect of Infliximab on PG.