This is a multi-center Phase 2, open label, safety extension study in subjects with moderate to severe CD who are anti-TNF inadequate responders. Subjects eligible for this study will have completed the 12-week induction period of study B0151003 and will be enrolled as either responders or non responders.

Inclusion Criteria:

• Subjects previously enrolled in study B0151003 and completed the blinded 84 day (12 week) induction period.
• Subjects who are willing and able to comply with scheduled visits, treatment plan, laboratory tests, and other study procedures.
• Women of childbearing potential, who have sexual intercourse with a non surgically sterilized male partner, must agree and commit to the use highly effective methods of birth control from signing of the ICD through 26 weeks after the Final Study Evaluation or for 62 weeks from the last dose of investigational product for any subject who terminates early from this study.

Exclusion Criteria:

• Subjects that have completed Day 84 (Week 12) of study B0151003, and experienced serious event(s) related to the investigational product, an unstable medical condition, or any other reason, in the opinion of the investigator, would preclude entry or inclusion in this study.
• Other severe acute or chronic medical or psychiatric condition or laboratory abnormality that may increase the risk associated with study participation or investigational product administration or may interfere with the interpretation of study results and, in the judgment of the investigator, would make the subject inappropriate entry into this study.
• Received any prohibited treatment during study B0151003 that, in the opinion of the investigator, compromised the safety or efficacy of this study.