Liver histology after 1 year of allopurinol plus low-dose thiopurine therapy in adults with inflammatory bowel disease

Phase 4, open-label trial of allopurinol, azathioprine and mercaptopurine in Crohn's disease and autoimmune colitis (2 arms), sponsored by Vrije University Medical Center. Primary endpoint: Histologically assessed nodular regenerative hyperplasia of the liver. Started Jun 2012; status: active, not recruiting.