Please select the eligibility criteria that correspond to the clinical trial below.
Title: A Phase 3, International, Multicenter, Double-blind, Placebo-controlled Study of the Efficacy, Safety, and Tolerability of Intravenous Antegren (Natalizumab) in Maintaining Clinical Response and Remission in Subjects With Crohn's Disease
Brief Summary: The purpose of this study is to determine the safety and efficacy of natalizumab in individuals diagnosed with moderate to severely active Crohn's disease. It is thought that natalizumab may stop the movement of certain cells, known as white blood cells, into bowel tissue. These cells are thought to cause damage in the bowel leading to the symptoms of Crohn's disease.


Options:
A: Inclusion Criteria:

1. Age 18 to 80
2. Diagnosis of moderately to severely active Crohn's disease (CD)
3. CD involvement of the ileum and/or colon
4. Demonstrated, over the previous 5 year period, an inadequate response to, loss of response to, or intolerance of at least 1 of the following agents, within protocol-specified parameters:

   1. Immunomodulators
   2. Tumor necrosis factor-alpha (TNFα) antagonists
   3. Corticosteroids
5. May be receiving a therapeutic dose of conventional therapies for irritable bowel disease (IBD) defined by the protocol

Exclusion Criteria

1. Evidence of abdominal abscess at the initial screening visit, other than a minimum of 10 aphthous ulcerations involving a minimum of 10 contiguous cm of intestine
2. Extensive colonic resection, subtotal or total colectomy
3. History of \>3 small bowel resections or diagnosis of short bowel syndrome
4. Ileostomy, colostomy, or known fixed symptomatic stenosis of the intestine
5. Have received non permitted IBD therapies within either 30 or 60 days, depending on the medication, as stated in the protocol
6. Chronic hepatitis B or C infection
7. Active or latent tuberculosis
B: Male and female patients at least 18 years of age who have at least a six-month history of Crohn's disease and who are currently experiencing moderately to severely active Crohn's disease. Women must not be breastfeeding or pregnant, and must not become pregnant during the study.
C: Male and female patients at least 18 years of age who have at least a six-month history of Crohn's disease and who are currently experiencing moderate to severely active Crohn's disease. Women must not be breastfeeding or pregnant, and must not become pregnant during this study. Patient enrollment requires previous participation in study AN100226-CD301 (please refer to the clinical trial listing for CD301).
D: Inclusion Criteria:

Each patient must meet all of the following inclusion criteria to be enrolled in the study:

1. Diagnosis of moderately to severely active ulcerative colitis
2. Demonstrated, over the previous 5 year period, an inadequate response to, loss of response to, or intolerance at least 1 of the following agents:

   1. Immunomodulators
   2. Tumor necrosis factor-alpha (TNFα) antagonists
   3. Corticosteroids
3. May be receiving a therapeutic dose of conventional therapies for inflammatory bowel disease (IBD) as defined by the protocol

Exclusion Criteria:

1. Evidence of abdominal abscess at the initial screening visit
2. Extensive colonic resection, subtotal or total colectomy
3. Ileostomy, colostomy, or known fixed symptomatic stenosis of the intestine
4. Have received non permitted IBD therapies within either 30 or 60 days, depending on the medication, as stated in the protocol
5. Chronic hepatitis B or C infection
6. Active or latent tuberculosis

Answer: C