A Study to Evaluate the Safety, Pharmacokinetics (PK), and Pharmacodynamics (PD) of TAK-079 in Combination With Standard Background Therapy in Participants With Moderate to Severe Systemic Lupus Erythematosus (SLE)

A Phase 1b Study to Evaluate the Safety, Pharmacokinetics, and Pharmacodynamics of TAK-079 in Combination With Standard Background Therapy in Patients With Moderate to Severe Systemic Lupus Erythematosus

The purpose of this study is to evaluate the safety and tolerability of TAK-079 in comparison with matching placebo, administered once every 3 weeks over a 12-week dosing period in participants with active SLE who are receiving stable background therapy for SLE.

TAK-079 is being tested in a study population with moderate to severe SLE. This study will evaluate the safety and biologic activity of TAK-079 or matching placebo in combination with stable SLE background therapy.

The study will enroll approximately 24 participants across 3 sequentially enrolling cohorts. Each cohort will enroll 8 participants, where 6 participants will be assigned to TAK-079 injection, and 2 participants will be assigned to Placebo. Participants will receive TAK-079 or matching placebo in combination with principal investigator directed background therapy for SLE.

This multi-center trial will be conducted in the United States. Participants will make multiple visits to the clinic, and will be followed up for the safety assessment for the additional 12 weeks up to Week 24 after receiving their last dose of study drug. Based on the clinical assessments, participants may complete or may advance to long-term safety follow up period for an additional 12-week safety monitoring period up to Week 36.

Inclusion Criteria:

1. The participant been diagnosed with SLE as defined by either the 2012 Systemic Lupus International Collaborating Clinics or the American College of Rheumatology diagnostic criteria.
2. The participant has a systemic Lupus Erythematosus Disease Activity Index 2000 (SLEDAI-2K) score greater than or equal to (>=) 6.
3. The participant is positive for anti-double-stranded deoxyribonucleic acid (dsDNA) antibodies and/or anti-extractable nuclear antigens (ENA) antibodies.

Exclusion Criteria:

1. The participant had an opportunistic infection less than or equal to (<=)12 weeks before initial study dosing or is currently undergoing treatment for a chronic opportunistic infection, such as tuberculosis (TB), pneumocystis pneumonia, cytomegalovirus, herpes simplex virus, herpes zoster, or atypical mycobacteria.
2. The participant currently has, or recently had, an acute or chronic infection requiring one or more of the following interventions: Hospitalization <=30 days before the screening visit. - Administered parenteral (IV or intramuscular) antibacterial, antiviral, antifungal, or antiparasitic agents <=30 days before the screening visit.
3. The participant has drug-induced SLE or any other rheumatologic or autoimmune disease (excluding secondary Sjögren syndrome or mixed connective tissue disease).