- Participation in either of the CDP870-031 [NCT00152490] or CDP870-032 [NCT00152425] clinical studies in which the subject completed the Week 2 assessment in CDP870-031 [NCT00152490] or the Week 6 randomization in CDP870-032 [NCT00152425] but whose Crohn's Disease was significantly worse as determined by the investigator and whose Clinical Disease Activity Index (CDAI) score at entry to this study is either (subjects may have received active or placebo treatment):