Overview A Study to Assess the Receptor Occupancy of CD86 and CD80 in Subjects With Rheumatoid Arthritis Initiating Abatacept Status: Completed Trial end date: 2011-10-01 Target enrollment: Participant gender: Summary The purpose of this study is to characterize CD86 receptor occupancy in subjects with rheumatoid arthritis (RA) receiving abatacept. Details Lead Sponsor: Astellas Pharma IncCollaborator: Perseid Therapeutics LLCTreatments: Abatacept