CD40LG and autoimmune hemolytic anemia: No evidence of autoimmune hemolytic anemia (AIHA) was found, including neither warm- nor cold-reactive IgG, IgA, or IgM autoantibodies, PCH (a negative D-L test and negative in RBC flow cytometry with fixation of possible cold-reacting RBC autoantibodies at 4 °C), PNH (2) or RBC T-activation (26) were observed.