RecruitingPhase 4Biological interventionA Study Describing the Efficacy and Safety of Belimumab Administered in Adult Participants With Early Systemic Lupus Erythematosus (SLE)This is a prospective, open-label, single arm 3-year clinical study to describe the short-term and long-term efficacy and safety of belimumab in participants with autoantibody positive early SLE with ongoing disease activity despite stable first-line SLE therapy.