An association between chronic neutrophilic leukaemia and multiple myeloma with a study of cobalamin-binding proteins.

Two patients are described who had evidence of both multiple myeloma and chronic neutrophilic leukaemia at or near the time of presentation. Descriptions of five similar patients were found in the literature supporting an association between the two disorders. This association is further evidence of a link between myeloproliferative and lymphoproliferative disorders. Cobalamin-binding studies of the plasma and neutrophils from one of these patients showed a gross elevation of plasma unsaturated TC I and abnormal neutrophils which contained TC I but not TC III.