A Phase 3, Pivotal, Open-label, Multicenter Study to Assess the Efficacy and Safety of Sutimlimab in Patients With Primary Cold Agglutinin Disease Who Have 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 (\>=) 2 grams per deciliter (g/dL) increase in hemoglobin (Hgb) levels or increased Hgb to \>= 12 g/dL and obviated the need for blood transfusion during treatment in participants with primary cold agglutinin disease (CAD) who had 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 CAD.
• 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; e) Immunoglobulin G (IgG) DAT less than or equal to (\<=) 1+, and f) No overt malignant disease.
• History of at least one documented blood transfusion within 6 months of enrollment.
• Hemoglobin level \<= 10.0 g/dL.
• Bilirubin level above the normal reference range, including participants with Gilbert's Syndrome.