Predictors of Prognosis in IBD Patients

Inclusion Criteria: * control group: Patients who do not have colitis, cancer, and advanced polyp (the number of polyps ≥ 3, the size of polyps ≥ 1cm, high-grade adenoma, villous adenoma) * TNF-α inhibitor-naive IBD group: IBD patients who do not have a history of TNF-α inhibitor treatment * TNF-α inhibitor-treated IBD group: IBD patients who are treated with TNF-α inhibitor Exclusion Criteria: * Age under 18 years * Patients who were treated with antibiotics or probiotics within the last 3 months