[Waldenström's macroglobulinemia with preserved antierythrocyte and antilipoprotein antibody activity].

One case of Waldenström's macroglobulinemia is reported, in which the monoclonal IgM has an antibody activity against stored red cells, beta-lipoproteins and mammalian glomeruli. The antibody activity is observed with the purified IgM molecule, which cross reacts with the three antigens, and with the Fab piece. The study of the cross reactions shows that the antibody recognizes similar rather than identical antigens. This observation is to be added to the few cases already published of antibody against stored red cells, and of Waldenström's macroglobulinemia with antibody activity. The physiopathology of the occurrence of a M component with such an activity is discussed.