Safety and Efficacy of QAX576 in Patients With Idiopathic Pulmonary Fibrosis (IPF)

Inclusion criteria * Diagnosis of Idiopathic Pulmonary Fibrosis (IPF), based on an appropriate clinical definition of IPF as detailed in the ATS/ERS/JRS/ALAT Statement: Idiopathic Pulmonary Fibrosis: Evidence-based Guidelines for Diagnosis and Management Diagnosis must be confirmed by a diagnostic HRCT or surgical lung biopsy. * A 6-minute walk test (6MWT) distance ≥50 meters at Screening (use of supplemental oxygen allowed). Exclusion criteria * Smokers (use of tobacco products in the previous 3 months). Urine cotinine levels will be measured during screening for all subjects. Smokers will be defined as any subject who reports tobacco use or has a urine cotinine levels in the range defined as 'smokers' per the local lab. * Lung residual volume \> 120% predicted at Screening.