a history of myocardial infarction within 1 year of screening visit (Visit 1) unstable or life-threatening cardiac arrhythmia. have been hospitalized for heart failure within the past year. known active tuberculosis a malignancy for which patient has undergone resection, radiation therapy or chemotherapy within last five years (patients with treated basal cell carcinoma are allowed) a history of life-threatening pulmonary obstruction a history of cystic fibrosis