A Continuation Trial for Subjects With Systemic Lupus Erythematosus That Have Completed Protocol LBSL02

An AE is defined as any unfavorable or unintended sign, symptom, or disease that is temporally associated with the use of a study agent but is not necessarily caused by the study agent. This includes worsening (example [eg], increase in frequency or severity) of pre-existing conditions. An SAE is defined as an AE resulting in any of the following outcomes: death, is life threatening (that is, an immediate threat to life), inpatient hospitalization, prolongation of an existing hospitalization, persistent or significant disability/incapacity, congenital anomaly/birth defect, and is medically important.

AE rates by SOC adjusting for participant-years on study drug anytime post Baseline are summarized, which included the follow up visits. Only treatmentemergent AEs are summarized. The Baseline is defined as the last available value prior to belimumab start date, for participants treated with placebo in the parent study and last pre-treatment value in the parent study for participants treated with belimumab in the parent study. The event rate of an AE was calculated as the number of events per 100 participant years: Event Rate=100* number of events divided by participant years. Participant years were calculated as sum across all participants ([last visit of interval day minus first visit of interval day plus 1] divided by 365).

SAE rates by SOC adjusting for participant-years on study drug anytime post Baseline are summarized, which included the follow up visits. Only treatmentemergent SAEs are summarized. The Baseline is defined as the last available value prior to belimumab start date, for participants treated with placebo in the parent study and last pretreatment value in the parent study for participants treated with belimumab in the parent study. The event rate of an SAE was calculated as the number of events per 100 participant years: Event Rate=100* number of events divided by participant years. Participant years were calculated as sum across all participants ([last visit of interval day minus first visit of interval day plus 1] divided by 365).

Hematology parameters were assessed at Baseline, Week 8, 16, 24, 40, and 48 during Year 1 to 8; Week 8, 16, 24, and 40 during Year 9; Week 24 and 40 during Year 10; Week 48 during Year 11; Week 32 during Year 13; Exit visit and at follow-up (up to 8 weeks and 24 weeks post last infusion). Change from Baseline in APTT and PT is summarized. The Baseline is defined as the Extension Year 1 Day 0 values for participants treated with placebo in the parent study and last pre-treatment value in the parent study for participants treated with belimumab in the parent study. Change from Baseline is defined as the difference between the post-dose post-Baseline visit value and the Baseline value.

Hematology parameters were assessed at Baseline, Week 8, 16, 24, 32, 40 and 48 during Year 1 to 12; Week 8, 16, 24, 32, and 40 during Year 13; Exit visit and at follow-up (up to 8 weeks and 24 weeks post last infusion). Change from Baseline in basophils, eosinophils, lymphocytes, monocytes, neutrophils segmented and platelets is summarized. The Baseline is defined as the Extension Year 1 Day 0 values for participants treated with placebo in the parent study and last pre-treatment value in the parent study for participants treated with belimumab in the parent study. Change from Baseline is defined as the difference between the post-dose post-Baseline visit value and the Baseline value.

Hematology parameters were assessed at Baseline, Week 8, 16, 24, 32, 40 and 48 during Year 1 to 12; Week 8, 16, 24, 32, and 40 during Year 13; Exit visit and at follow-up (up to 8 weeks and 24 weeks post last infusion). Change from Baseline in erythrocytes is summarized. The Baseline is defined as the Extension Year 1 Day 0 values for participants treated with placebo in the parent study and last pre-treatment value in the parent study for participants treated with belimumab in the parent study. Change from Baseline is defined as the difference between the post-dose post-Baseline visit value and the Baseline value.

Hematology parameters were assessed at Baseline, Week 8, 16, 24, 32, 40 and 48 during Year 1 to 12; Week 8, 16, 24, 32, and 40 during Year 13; Exit visit and at follow-up (up to 8 weeks and 24 weeks post last infusion). Change from Baseline in hematocrit is summarized. The Baseline is defined as the Extension Year 1 Day 0 values for participants treated with placebo in the parent study and last pre-treatment value in the parent study for participants treated with belimumab in the parent study. Change from Baseline is defined as the difference between the post-dose post-Baseline visit value and the Baseline value.

Hematology parameters were assessed at Baseline, Week 8, 16, 24, 32, 40 and 48 during Year 1 to 12; Week 8, 16, 24, 32, and 40 during Year 13; Exit visit and at follow-up (up to 8 weeks and 24 weeks post last infusion). Change from Baseline in hemoglobin is summarized. The Baseline is defined as the Extension Year 1 Day 0 values for participants treated with placebo in the parent study and last pre-treatment value in the parent study for participants treated with belimumab in the parent study. Change from Baseline is defined as the difference between the post-dose post-Baseline visit value and the Baseline value.

Clinical chemistry parameters were assessed at Baseline, Week 8, 16, 24, 32, 40 and 48 during Year 1 to 12; Week 8, 16, 24, 32, and 40 during Year 13; Exit visit and at follow-up (up to 8 weeks and 24 weeks post last infusion). Change from Baseline in albumin and protein is summarized. The Baseline is defined as the Extension Year 1 Day 0 values for participants treated with placebo in the parent study and last pre-treatment value in the parent study for participants treated with belimumab in the parent study. Change from Baseline is defined as the difference between the post-dose post-Baseline visit value and the Baseline value.

Clinical chemistry parameters were assessed at Baseline, Week 8, 16, 24, 32, 40 and 48 during Year 1 to 12; Week 8, 16, 24, 32, and 40 during Year 13; Exit visit and at follow-up (up to 8 weeks and 24 weeks post last infusion). Change from Baseline in BUN, glucose, calcium, carbon dioxide, chloride, magnesium, phosphate, potassium and sodium is summarized. The Baseline is defined as the Extension Year 1 Day 0 values for participants treated with placebo in the parent study and last pre-treatment value in the parent study for participants treated with belimumab in the parent study. Change from Baseline is defined as the difference between the post-dose post-Baseline visit value and the Baseline value.

Clinical chemistry parameters were assessed at Baseline, Week 8, 16, 24, 32, 40 and 48 during Year 1 to 12; Week 8, 16, 24, 32, and 40 during Year 13; Exit visit and at follow-up (up to 8 weeks and 24 weeks post last infusion). Change from Baseline in creatinine, urate, and bilirubin is summarized. The Baseline is defined as the Extension Year 1 Day 0 values for participants treated with placebo in the parent study and last pre-treatment value in the parent study for participants treated with belimumab in the parent study. Change from Baseline is defined as the difference between the post-dose post- Baseline visit value and the Baseline value.

Clinical chemistry parameters were assessed at Baseline, Week 8, 16, 24, 32, 40 and 48 during Year 1 to 12; Week 8, 16, 24, 32, and 40 during Year 13; Exit visit and at follow-up (up to 8 weeks and 24 weeks post last infusion). Change from Baseline in BUN/creatinine is summarized. The Baseline is defined as the Extension Year 1 Day 0 values for participants treated with placebo in the parent study and last pre-treatment value in the parent study for participants treated with belimumab in the parent study. Change from Baseline is defined as the difference between the post-dose post-Baseline visit value and the Baseline value.

Clinical chemistry parameters were assessed at Baseline, Week 8, 16, 24, 32, 40 and 48 during Year 1 to 12; Week 8, 16, 24, 32, and 40 during Year 13; Exit visit and at follow-up (up to 8 weeks and 24 weeks post last infusion). Change from Baseline in ALT, AP, AST, GGT and LD are summarized. Baseline is defined as the Extension Year 1 Day 0 values for participants treated with placebo in the parent study and last pre-treatment value in the parent study for participants treated with belimumab in the parent study. Change from Baseline is defined as the difference between the post-dose post-Baseline visit value and the Baseline value.

SRI response was assessed at Week 16, 32, and 48 during Year 1 to 12 and Week 16 and 32 during Year 13. Baseline is defined as the last available value prior to belimumab start date, for participants treated with placebo in the parent study and last pre-treatment value in the parent study for participants treated with belimumab in the parent study. SRI response is defined as:>=4 point reduction from the Baseline in safety of estrogen in lupus national assessment (SELENA) SLE disease activity index (SLEDAI) score and no worsening (increase of <0.30 points from the Baseline) in Physician's Global Assessment (PGA), and no new British Isles Lupus Assessment Group (BILAG) A organ domain score or 2 new BILAG B organ domain scores compared with the Baseline at the time of assessment.

Anti-double stranded DNA levels in participants positive at Baseline were assessed at Baseline, Week 16, 32, and 48 during Year 1 to 11, Week 16 and 32 during Year 13, Exit visit and at follow-up (up to 8 weeks and 24 weeks post last infusion). The Baseline is defined as the last available value prior to belimumab start date, for participants treated with placebo in the parent study and last pre-treatment value in the parent study for participants treated with belimumab in the parent study. For Year 1, Baseline included Extension Year 1 Day 0 values for MITT participants treated with placebo in the parent study, and the last pre-treatment value in the parent study for MITT participants treated with belimumab in the parent study.

Anti-double stranded DNA levels for participants positive at Baseline were assessed at Baseline, Week 16, 32, and 48 during Year 1 to 11, Week 16 and 32 during Year 13, Exit visit and at follow-up (up to 8 weeks and 24 weeks post last infusion). The Baseline is defined as the last available value prior to belimumab start date, for participants treated with placebo in the parent study and last pre-treatment value in the parent study for participants treated with belimumab in the parent study. For Year 1, Baseline included Extension Year 1 Day 0 values for MITT participants treated with placebo in the parent study, and the last pre-treatment value in the parent study for MITT participants treated with belimumab in the parent study. Percent change from Baseline is defined as the percentage of the difference between the post-dose post-Baseline visit value and the Baseline value.

Complement C3 and C4 levels were assessed in participants low at Baseline at Baseline, Week 16, 32, and 48 during Year 1 to 12, Week 16 and 32 during Year 13, and Exit visit. The Baseline is defined as the last available value prior to belimumab start date, for participants treated with placebo in the parent study and last pre-treatment value in the parent study for participants treated with belimumab in the parent study. For Year 1, Baseline included Extension Year 1 Day 0 values for MITT participants treated with placebo in the parent study, and the last pre-treatment value in the parent study for MITT participants treated with belimumab in the parent study.

Complement C3 and C4 levels were assessed in participants low at Baseline at Baseline, Week 16, 32, and 48 during Year 1 to 12, Week 16 and 32 during Year 13, and Exit visit. The Baseline is defined as the last available value prior to belimumab start date, for participants treated with placebo in the parent study and last pre-treatment value in the parent study for participants treated with belimumab in the parent study. For Year 1, Baseline included Extension Year 1 Day 0 values for MITT participants treated with placebo in the parent study, and the last pre-treatment value in the parent study for MITT participants treated with belimumab in the parent study. Percent change from Baseline is defined as the percentage of the difference between the post-dose post-Baseline visit value and the Baseline value.

Daily prednisone dose reduction was assessed at Baseline, Week 8, 16, 24, 32, 40, and 48 during Year 1 to 12 and Week 8, 16, 24, 32, and 40 during Year 13. Percentage of participants with daily prednisone dose reduced to <=7.5 mg/day from >7.5 mg/kg at the Baseline are summarized. Baseline is defined as the last available value prior to belimumab start date, for participants treated with placebo in the parent study and last pre-treatment value in the parent study for participants treated with belimumab in the parent study.

Serum immunoglobulin G values were assessed at Baseline, Week 8, 16, 24, 32, 40, and 48 during Year 1 to 12 and Week 8, 16, 24, 32, and 40 during Year 13, Exit visit and at follow-up (up to 8 weeks and 24 weeks post last infusion). Baseline is defined as the last available value prior to belimumab start date, for participants treated with placebo in the parent study and last pre-treatment value in the parent study for participants treated with belimumab in the parent study. For Year 1, Baseline included Extension Year 1 Day 0 values for MITT participants treated with placebo in the parent study, and the last pre-treatment value in the parent study for MITT participants treated with belimumab in the parent study.

Serum immunoglobulin G values were assessed at Baseline, Week 8, 16, 24, 32, 40, and 48 during Year 1 to 12 and Week 8, 16, 24, 32, and 40 during Year 13, Exit visit and at follow-up (up to 8 weeks and 24 weeks post last infusion). Baseline is defined as the last available value prior to belimumab start date, for participants treated with placebo in the parent study and last pre-treatment value in the parent study for participants treated with belimumab in the parent study. For Year 1, Baseline included Extension Year 1 Day 0 values for MITT participants treated with placebo in the parent study, and the last pre-treatment value in the parent study for MITT participants treated with belimumab in the parent study. Percent change from Baseline is defined as the percentage of the difference between the post-dose post-Baseline visit value and the Baseline value.