title: Acquired deficiency of the inhibitor of the first component of complement: report of five additional cases with commentary on the syndrome.
mesh_terms: D003174:Complement C1 Inactivator Proteins / Q000172:deficiency*; D006801:Humans; D007145:Immunoglobulin kappa-Chains; D007153:Immunologic Deficiency Syndromes / Q000276:immunology*; D008297:Male; D008875:Middle Aged; D009101:Multiple Myeloma / Q000276:immunology
chemical_list: D003174:Complement C1 Inactivator Proteins; D007145:Immunoglobulin kappa-Chains