A Study to Evaluate the Efficacy and Safety of Sifalimumab in Adults With Systemic Lupus Erythematosus

A Phase 2b, Dose-ranging Study to Evaluate the Efficacy and Safety of Sifalimumab in Adults With Systemic Lupus Erythematosus

To evaluate the efficacy and safety of sifalimumab compared to placebo in subjects with moderately to severely active Systemic Lupus Erythematosus (SLE).

This is a Phase 2b, multinational, multicenter, randomized, double-blind, placebo controlled, parallel group study to evaluate the efficacy and safety of three intravenous (IV) treatment regimens of sifalimumab (200, 600, or 1,200 mg) in adult subjects with chronic moderately-to-severely active SLE with an inadequate response to standard of care (SOC) for SLE.

Inclusion Criteria: - Fulfills at least 4 of American College of Rheumatology (ACR) criteria for systemic lupus erythematosus (SLE) including a positive antinuclear antibody (ANA) or elevated ds-deoxyribonucleic acid (DNA) or Sm antibody at screening - Disease history of SLE greater than or equal to (>=) 24 weeks at screening - Weight more than (>) 40 kilogram (kg) - Currently receiving stable dose of oral prednisone and/or antimalarials/immunosuppressives - Active moderate to severe SLE disease based on SLE disease activity score (SLEDAI) and British Isles Lupus Assessment Group Index (BILAG) and Physicians Global Assessment - No evidence of cervical malignancy on PAP within 6 months of randomization - Female subjects must be willing to avoid pregnancy - Negative TB test or newly positive TB test due to latent TB for which treatment must be initiated at or before randomization. Exclusion Criteria: - Active severe SLE-driven renal disease or unstable renal disease prior to screening - Active severe or unstable neuropsychiatric SLE - Clinically significant active infection including ongoing and chronic infections - History of human immunodeficiency virus (HIV) - Confirmed Positive tests for Hepatitis B or positive test for hepatitis C - History of severe herpes infection such as herpes encephalitis, ophthalmic herpes, disseminated herpes - Herpes Zoster within 3 months of screening - History of cancer other than basal cancer or cervical cancer treated with apparent success >=1 year prior to randomization - Receipt of a biologic agent within 5 half-lives or prior to loss of pharmacodynamic and/or clinical effect (whichever is longer) prior to screening - Live or attenuated vaccine within 4 weeks prior to screening - Subjects with substance abuse - Subjects with significant hematologic abnormalities.