Abstract
In a medical health survey in 1964 of 6995 subjects, 64 persons with M-components were detected by serum electrophoresis. One had clear cut signs of myelomatosis and 1 had lymphatic leukemia. Eleven years later 27 persons had died. In the case with lymphatic leukemia the disease changed after 6 yr into myelomatosis. One person died after 9 yr from malignant lymphoma. Among the 37 persons still alive there seemed to be no clustering of diseases. The whole series represents an observation time of 487 yr. No more myelomas or lymphomas were detected. One M-component disappeared.