Study terminated due to lack of efficacy

The main purpose of this study is to assess the efficacy and safety of LY3361237 in participants with at least moderately active systemic lupus erythematosus (SLE). Study will last up to 34 weeks and may include up to 15 visits.

Inclusion Criteria:

• Are diagnosed with SLE at least 24 weeks before Day 1 of study
• Have documentation of having a score of 10 or more points on the European League Against Rheumatism (EULAR)/American College of Rheumatology (ACR) 2019 classification criteria for SLE
• Have a SLEDAI-2K score ≥6 at screening (Day 1) and clinical Systemic Lupus Erythematosus Disease Activity Index 2000 (SLEDAI-2K) score ≥4 (not including any items related to laboratory values) at randomization (Day 2)
• Must be receiving at least 1 background standard-of-care medication for SLE

Exclusion Criteria:

• Participants are excluded if they have received any of the following medications or therapies within the indicated timeframe prior to the randomization visit (Day 2).
• Are currently receiving oral corticosteroids at doses >20 mg per day of prednisone (or equivalent) or have adjusted the dosage of corticosteroids within 2 weeks before starting study treatment
• Have received parenteral corticosteroids within 12 weeks before starting study treatment or are expected to require parenteral corticosteroids during the study
• Have a current or recent acute, active infection
• Have had a serious, chronic, recurring conditions of herpes simplex, herpes zoster, recurring cellulitis, chronic osteomyelitis)
• Have human immunodeficiency virus (HIV) infection, hepatitis B virus (HBV), hepatitis C infection (HCV), active tuberculosis (TB)
• Have active fibromyalgia or active occurrence of an inflammatory condition that, in the investigator's opinion, would make it difficult to appropriately assess SLE activity for the purposes of this study
• Have experienced a cardiac event within 24 weeks to 12 months prior to screening
• Have a history of clinically significant or uncontrolled illness that in the opinion of the investigator could put the participant at risk to participate in the study
• Are, in the judgment of the investigator, actively suicidal and therefore deemed to be at significant risk for suicide
• Are pregnant or are intending to become pregnant or to breastfeed at any time in the study

Anonymized individual patient level data will be provided in a secure access environment upon approval of a research proposal and a signed data sharing agreement.

Data are available 6 months after the primary publication and approval of the indication studied in the US and European Union (EU), whichever is later. Data will be indefinitely available for requesting.