Multiple Ascending Doses of AMG 139 in Healthy and Crohn's Disease Subjects

Inclusion Criteria:

Part A - Healthy Subjects:

• Healthy male or female of non-reproductive potential subjects between 18 to 45 years-of-age
• Body mass index (BMI) between 18 and 32 kg/m2
• Normal or clinically acceptable physical examination, clinical laboratory values, and ECG
• Additional inclusion criteria apply

Part B - Crohn's Subjects:

• Male or female subjects with CD between 18 to 55 years-of-age
• Body mass index (BMI) between 18 and 32 kg/m2
• Normal or clinically acceptable physical examination (PE), clinical laboratory values, and ECG; clinically acceptable PE includes evidence of mild to severe CD
• Diagnosis of ileal or ileo-colonic CD for a minimum of 6 months
• Mild to severe CD defined by a Crohn's Disease Activity Index (CDAI) score equal to or greater than 180 and equal to or less than 450
• Elevated fecal calprotectin and CRP
• Additional inclusion criteria apply

Exclusion Criteria:

Parts A - Healthy Subjects:

• History or evidence of a clinically significant disorder (including psychiatric), condition or disease that would pose a risk to subject safety or interfere with the study evaluation, procedures or completion;
• Recent or on-going infection(s)
• Underlying condition(s) that predisposes the subject to infections
• History of malignancy of any type
• Additional exclusion criteria apply

Part B only - Crohn's Subjects:

• History or evidence of a clinically significant disorder (including psychiatric), condition or disease that would pose a risk to subject safety or interfere with the study evaluation, procedures or completion;
• Recent or on-going infection(s)
• Underlying condition(s) that predisposes the subject to infections
• History of malignancy of any type
• Additional exclusion criteria apply