SD, IL-13 Production Rate in IPF

Inclusion Criteria: * Men and women between the ages of 40 and 80 years with a confirmed diagnosis of idiopathic pulmonary fibrosis * Both men and women must be on non-childbearing potential. Additional information regarding this requirement is available at screening. * Capability to meet certain lung function tests at screening * Non-smokers * No participation in another clinical study within 4 weeks of study start. Exclusion Criteria: * Certain medical conditions may exclude candidates from participation. * Blood loss or donation of 400 mL or more within 2 months of study start Significant illness (other than respiratory) within 2 weeks of study start * Past medical personal or close family history of clinically significant ECG abnormalities * Connective tissue disorders * Active infection or history of systemic parasitic infection * Known hypersensitivity to the drug. * History of immunocompromise, including a positive HIV test result. * History of drug or alcohol abuse within 12 months of study start * Any condition that may compromise patient safety