Please assess the completion status of the following clinical trial:

Trial Title: BIIB023 Proof-of-Concept Study in Participants With Lupus Nephritis

Study Design Characteristics:
- Allocation: RANDOMIZED
- Intervention Model: PARALLEL
- Observational Model: None
- Primary Purpose: TREATMENT
- Time Perspective: None
- Masking: DOUBLE
- Phase: PHASE2
- Number of Arms: 3.0

Eligibility Criteria:
Key Inclusion Criteria:~* Documented diagnosis of systemic lupus erythematosus (SLE) according to current American College of Rheumatology (ACR) criteria. At least 4 ACR criteria must be documented, 1 of which must be a positive antinuclear antibody (ANA), anti Sm, or anti dsDNA antibody.~* Diagnosis of International Society of Nephrology/Renal Pathology Society (ISN/RPS) 2003 Class III or IV lupus nephritis with either active or active/chronic disease, confirmed by biopsy within 3 months prior to Screening. Participants are permitted to have co existing Class V lupus nephritis. If a renal biopsy has not been performed within 3 months of the Screening Visit, one can be performed during the Screening Period after all other eligibility criteria have been confirmed. The local histological diagnosis must be confirmed by the central study pathologist.~* Must have proteinuria at Screening (from a 24 hour urine sample collection) defined as urinary protein:creatinine ratio (uPCR) \>1.0 mg/mg.~Key Exclusion Criteria:~* Retinitis, poorly-controlled seizure disorder, acute confusional state, myelitis, stroke or stroke syndrome, cerebellar ataxia, or dementia that is currently active and resulting from SLE at Screening~* Estimated glomerular filtration rate (eGFR) \<30 mL/min per 1.73 m\^2 (calculated using the abbreviated Modification of Diet in Renal Disease equation) or the presence of oliguria or end-stage renal disease requiring dialysis or transplantation~* Subjects requiring dialysis within 12 months prior to Screening~* History of renal transplant~* Treatment with any biologic B-cell-depleting therapy (e.g., anti-CD20 \[rituximab\], anti-CD22 \[epratuzumab\], anti-BLyS/B-cell activating factor \[e.g., briobacept, belimumab\] therapy), or TACI-Ig within 12 months prior to Run-in Day 1.~NOTE: Other protocol defined Inclusion/Exclusion criteria may apply.

- Gender: ALL
- Minimum Age: 18 Years
- Maximum Age: 75 Years
- Healthy Volunteers: f

Study Arms:
- Placebo (Type: PLACEBO_COMPARATOR): Placebo intravenous (IV) infusion on Day 1, Week 2, Week 4, Week 8, and every 4 weeks thereafter through Week 48, plus background therapy including oral steroids (prednisone or equivalent) and mycophenolate mofetil (MMF)
- BIIB023 3 mg/kg (Type: EXPERIMENTAL): BIIB023 3 mg/kg IV on Day 1, Week 2, Week 4, Week 8, and every 4 weeks thereafter through Week 48 plus background therapy including oral steroids (prednisone or equivalent) and MMF.
- BIIB023 20 mg/kg (Type: EXPERIMENTAL): BIIB023 20 mg/kg IV on Day 1, Week 2, Week 4, Week 8, and every 4 weeks thereafter through Week 48 plus background therapy including oral steroids (prednisone or equivalent) and MMF.

Based on this trial design, predict the completion outcome and termination type (if applicable).