Multicentre, prospective, observational study on the effectiveness and safety of upadacitinib for active perianal fistulising Crohn's disease in patients with prior anti-tumour necrosis factor failure: a study protocol.
Perianal fistulising Crohn's disease is hard to treat and often fails anti-TNF drugs. This study will provide real-world data on whether upadacitinib can be effective and safe for patients with refractory perianal...