CD79A and monoclonal gammopathy: Ten patients had abnormal serum protein electrophoresis (among 23 available), with 5 having polyclonal hypergammaglobulinemia (all between 15 and 20 g/L), 2 having hypogammaglobulinemia (6–8 g/L), 2 having monoclonal gammopathies of undetermined significance (IgA and IgG) and one having type 2 cryoglobulinemia.