Efficacy and Safety of Dual-targeted Therapy With Upadacitinib and Ustekinumab Versus Intensified Ustekinumab Therapy in Crohn's Disease

Participants in this group will maintain the original Ustekinumab regimen, receiving 90 mg administered subcutaneously every 8 weeks. In addition, they will receive Upadacitinib administered orally at a dosage of 45 mg daily for 12 weeks. After the 12-week period, the dosage of Upadacitinib will be adjusted based on patient condition and clinical judgment, continuing until the evaluation at week 16. Clinical efficacy of the dual-target therapy will be evaluated at week 16.

Participants will receive an additional induction dose of Ustekinumab administered intravenously at 6 mg/kg at baseline. This will be followed by subcutaneous maintenance therapy of 90 mg every 4 weeks. Clinical efficacy will be evaluated at week 16.