A Study to Assess the Efficacy and Safety of BIVV009 (Sutimlimab) in Participants With Primary Cold Agglutinin Disease Without A Recent History of Blood Transfusion

A Phase 3, Randomized, Double-blind, Placebo-controlled Study to Assess the Efficacy and Safety of Sutimlimab in Patients With Primary Cold Agglutinin Disease Without a Recent History of Blood Transfusion

The purpose of Part A was to determine whether sutimlimab administration resulted in a greater than or equal to (>=)1.5 grams per deciliter (g/dL) increase in hemoglobin (Hgb) level and avoidance of transfusion in participants with primary cold agglutinin disease (CAD) without a recent history of blood transfusion. The purpose of Part B was to evaluate the long-term safety and tolerability of sutimlimab in participants with primary CAD.

The planned total study duration per participant was approximately 1.5 to 2.5 years.

Inclusion criteria:

• Body weight of >=39 kg at screening.
• Confirmed diagnosis of primary CAD based on the following criteria: a) Chronic hemolysis, b) Polyspecific direct antiglobulin test (DAT) positive, c) Monospecific DAT strongly positive for C3d, d) Cold agglutinin titer >= 64 at 4 degree Celsius, and e) Immunoglobulin G DAT less than or equal to (<=) 1+, and, f) No overt malignant disease.
• Hemoglobin level <= 10.0 g/dL.
• Bilirubin level above the normal reference range, including participants with Gilbert's Syndrome.

Exclusion criteria:

• Cold agglutinin syndrome secondary to infection, rheumatologic disease, or active hematologic malignancy.
• History of blood transfusion within 6 months of screening, or history of more than one blood transfusion within 12 months of screening.
• Clinically relevant infection of any kind within the month preceding enrollment (example, active hepatitis C, pneumonia).
• Clinical diagnosis of systemic lupus erythematosus; or other autoimmune disorders with anti-nuclear antibodies at screening. Anti-nuclear antibodies of long-standing duration without associated clinical symptoms would be adjudicated on a case-by-case basis during the confirmatory review of participant eligibility.
• Positive hepatitis panel (including hepatitis B surface antigen and/or hepatitis C virus antibody) prior to or at screening.
• Positive human immunodeficiency virus antibody at screening.
• Treatment with rituximab monotherapy within 3 months or rituximab combination therapies (example, with bendamustine, fludarabine, ibrutinib, or cytotoxic drugs) within 6 months prior to enrollment.

The above information was not intended to contain all considerations relevant to a participant's potential participation in a clinical trial.