Efficacy, Safety and Tolerability of AIN457 in Moderate to Severe Active Crohn's Disease

Inclusion Criteria: * Male or female; 18-75 years old * Diagnosis of Crohn's disease for at least 3 months prior to screening * Confirmation of Crohn's disease by endoscopic or imaging examination * Moderately active Crohn's disease at baseline, defined as: * CDAI ≥220 and ≤450 * Active disease despite prior treatment with corticosteroids for at least 2 weeks, or immunosuppressants for at least 3 months. Treatment with azathioprine, 6-MP or MTX is allowed but must have been on a stable dose for at least 10 weeks, corticosteroids are allowed but must have been on a stable doses of prednisolone not exceeding 40 mg for two weeks prior to baseline. Immunosuppressants other than those listed above, such as cyclosporine, tacrolimus and mycophenolate, are not allowed and must be stopped (wash-out periods defined in the protocol); Exclusion Criteria: * Body Mass Index \>34 * Positive PPD tuberculin skin test or QuantiFeron test * Any subject with evidence of active pulmonary disease or evidence of latent tuberculosis or fungal infection at screening or within past 3 months * Symptoms associated with active bowel structuring disease and pre-stenotic dilation on radiographs * Fistulizing disease if complicated by sepsis and/or untreated abscess * Multiple bowel surgeries and clinically important short bowel syndrome defined as an inability to maintain caloric intake * Use of certain medications as specified in the protocol * Clinical improvement due to other Crohn's therapy Other protocol-defined inclusion/exclusion criteria may apply