Genetic propensity to benignity in monoclonal-gammopathy.

52 patients with benign monoclonal gammopathy were HLA typed and compared withe 48 patients with malignant monoclonal gammopathy. Antigen B40 was more frequent within the first sample. This association is discussed, together with the results of familial investigations. For systematic serum electrophoresis detected 5 benign monoclonal gammopathies in 172 relatives of 37 patients suffering from multiple myeloma or Waldenström's macroglobulinemia.