A Study of Long-term Effects of Vedolizumab Subcutaneous in Adults With Ulcerative Colitis and Crohn's Disease

The drug being tested in this study is called vedolizumab subcutaneous (vedolizumab SC). Vedolizumab SC is being tested to assess its long-term safety and effectiveness in treating participants with UC or CD. This study will look at the long-term side effects and response/remission of UC and CD in participants who received vedolizumab SC in a prior vedolizumab SC study. The study will enroll up to 692 patients. All participants enrolled in this study will have previously participated in the MLN0002SC-3027 or MLN0002SC-3031 study. Participants who completed the Maintenance Period (Week 52) in their previous study, or who did not achieve a clinical response at Week 6 but who did achieve a clinical response at Week 14 after having received a third vedolizumab IV infusion at Week 6 in their previous study, will receive open-label vedolizumab SC 108 mg, once every 2 weeks (Q2W). Participants who withdrew early from the Maintenance Period of their previous study due to disease worsening or need for rescue medications will receive open-label vedolizumab SC 108 mg, once every week (QW). Participants receiving SC 108 mg Q2W who experience treatment failure (disease worsening or need for rescue medications while in the current study will be dose escalated to vedolizumab SC 108 mg QW. This multi-center trial will be conducted worldwide. Participation in this vedolizumab SC study will continue until vedolizumab SC becomes commercially available, the participant withdraws from the study, or the sponsor decides to close the study. Participants will make multiple visits to the clinic, plus a final visit 18 weeks after last dose of study drug for a follow-up assessment. Participants will also participate in a long-term safety follow-up, by phone, at 6 months after the last dose of study drug.