A Study to Assess the Efficacy and Safety of BIVV009 (Sutimlimab) in Participants With Primary Cold Agglutinin Disease Who Have a Recent History of Blood Transfusion (Cardinal Study)

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.