Clinical Efficacy of Ustekinumab in Crohn's Disease

This study is looking at how well ustekinumab works in real-world patients with Crohn's disease — a long-term inflammatory bowel condition. Ustekinumab is an approved biologic medication that dampens certain immune signals involved in inflammation. Researchers want to see how it performs outside of clinical trial conditions. **You may be eligible if...** - You are 18 years or older - You were first prescribed ustekinumab between January 1 and December 31, 2024 - You have provided written informed consent to participate **You may NOT be eligible if...** - You have an active serious infection such as tuberculosis or viral hepatitis - You are pregnant or breastfeeding - You have ulcerative colitis (not Crohn's disease) - You have or have had a malignant (cancerous) gastrointestinal disease - You have severe liver, kidney, heart, or blood vessel disease, or uncontrolled diabetes - You have abused alcohol or drugs in the past year - You are currently participating in another interventional clinical trial Talk to your doctor to see if this trial is right for you.