This study will assess the effect of a 24-week withdrawal of belimumab followed by a 28-week reintroduction of belimumab 10 mg/kg plus standard of care medications on immunogenicity, markers of biological activity, efficacy, and safety in subjects with stable low systemic lupus erythematosus (SLE) disease activity. Additionally, this study will assess rebound phenomenon in subjects with any disease level of SLE who have permanently withdrawn from further belimumab treatment
