This is a non-interventional, retrospective, and longitudinal study of participants with IBD (UC or CD) receiving vedolizumab between years 2015 and 2020. The study will determine the real-world evidence of vedolizumab, its relationship with TDM, biomarkers of inflammation, and its effect on clinical outcomes in a real-world setting.~This study will enroll approximately 5,500 participants. Participants will be enrolled in 2 cohorts: TDM Cohort and Historical Cohort. The study will have a retrospective data collection of the participants from PSP between the years 2015 and 2020. The study will include longitudinal analysis of data collected in a subset of Takeda Canada PSP, specifically for those participants on vedolizumab, some of which received biomarker testing and TDM at pre-specified intervals during their treatment.~This multi-center trial will be conducted in Canada. The overall time for data collection in the study will be approximately 5 years.
The purpose of this study is to determine if a relationship exists between Week 6 vedolizumab therapeutic drug monitoring (TDM) and Week 30 Faecal calprotectin (FCP).