to define further the factor viii abnormality in acquired von willebrand 's disease , we performed immunoelectrophoresis of factor viii antigen , as well as quantitative measurements of the antigen , factor viii procoagulant activity and von willebrand factor activity on plasma from an affected 57-year-old man who also had a poorly differentiated lymphocytic lymphoma .
C0015506
factor viii
C0042974
von willebrand 's