Vedolizumab Intravenous (IV) Compared to Placebo in Chinese Participants With Crohn's Disease.

Inclusion Criteria

• Has a diagnosis of Crohn's disease (CD) established at least 3 months prior to Screening by clinical and endoscopic evidence corroborated by a histopathology report. Cases of CD established at least 6 months prior to randomization for which a histopathology report is not available will be considered based on the weight of evidence supporting the diagnosis and excluding other potential diagnosis, and must be discussed with the sponsor on a case-by-case basis prior to randomization.
• Has moderately to severely active CD as determined by a Crohn's Disease Activity Index (CDAI) score of 220 to 400 within 7 days prior to the first dose of study drug and 1 of the following:
• C-reactive protein (CRP) level >2.87 mg/L during the Screening Phase, OR
• Ileocolonoscopy with photographic documentation of a minimum of 3 nonanastomotic ulcerations (each >0.5 cm in diameter) or 10 aphtous ulcerations (involving a minimum of 10 contiguous cm of intestine) consistent with CD, within 4 months prior to randomization, OR
• Fecal calprotectin >250 μg/g stool during the Screening Phase in conjunction with computed tomography enterography (CTE), magnetic resonance enterography (MRE), contrast enhanced small bowel radiography, or wireless capsule endoscopy revealing CD ulcerations (aphthae not sufficient), within 4 months prior to Screening
• Has CD involvement of the ileum and/or colon, at a minimum.
• Has extensive colitis or pancolitis of >8 years duration or limited colitis of >12 years duration must have documented evidence that a surveillance colonoscopy was performed within 12 months prior to initial screening (may be performed during Screening if not performed in previous 12 months).
• Has a family history of colorectal cancer, personal history of increased colorectal cancer risk, age >50 years, or other known risk factor must be up-to-date on colorectal cancer surveillance (may be performed during Screening).
• Has demonstrated an inadequate response to, loss of response to, or intolerance of at least 1 of the following agents as defined below:
• Corticosteroids.
• Immunomodulators.
• Tumor necrosis factor-alpha (TNF-α) antagonists.

Exclusion Criteria

• Has evidence of abdominal abscess at the initial Screening Visit.
• Has had extensive colonic resection, subtotal or total colectomy.
• Has a history of >3 small bowel resections or diagnosis of short bowel syndrome.
• Has had ileostomy, colostomy, known fixed symptomatic stenosis of the intestine, or evidence of fixed stenosis, or small bowel stenosis with prestenotic dilation.
• Has had previous exposure to approved or investigational anti-integrins (e.g., natalizumab, efalizumab, etrolizumab, or AMG-181), or MAdCAM-1 antagonists, or rituximab.
• Has used topical (rectal) treatment with 5-ASA, corticosteroid enemas/suppositories or traditional Chinese medications for CD treatment within 2 weeks of the administration of the first dose of study drug.
• Requires currently or is anticipated to require surgical intervention for CD during the study.
• Has a history or evidence of adenomatous colonic polyps that have not been removed.
• Has a history or evidence of colonic mucosal dysplasia including low or high-grade dysplasia, as well as indeterminate for dysplasia.
• Has a suspected or confirmed diagnosis of ulcerative colitis, indeterminate colitis, ischemic colitis, and radiation colitis.
• Has evidence of treatment for C.difficile infection or other intestinal pathogen with 28 days prior to first dose of study drug.
• Has chronic hepatitis B virus (HBV) infection or chronic hepatitis C virus (HCV) infection.
• Has active or latent tuberculosis.
• Has any identified congenital or acquired immunodeficiency (e.g., common variable immunodeficiency, human immunodeficiency virus [HIV] infection, organ transplantation).
• Has any history of malignancy, except for the following: (a) adequately-treated nonmetastatic basal cell skin cancer; (b)