Study Evaluating rhIL-11 in Active Crohn's Disease

Inclusion Criteria: * Documented, signed and dated informed consent to participate in this trial prior to any study related procedures being performed. * Men and women age 16 years and over. * Diagnosis of Crohn's disease for at least 6 months that has been appropriately documented and confirmed by radiological studies, endoscopy (with histological examination preferred), or surgical pathology (Patients with a diagnosis of Crohn's disease for less than 6 months may be included if the diagnosis is confirmed by a biopsy characteristic of Crohn's disease) Exclusion Criteria: Use of the following medications within the specified time period prior to randomization: * Nonsteroidal anti-inflammatory drugs (NSAIDs; including Cyclooxygenase-2 \[COX-2\] inhibitors and \>500 mg/day acetylsalicylic acid) * Codeine-containing compounds * Corticosteroid enemas