“…During the last two decades M-components have been detected in the sera of patients suffering from malignant lymphoma (Azar, Hill and Osserman, 1957;Krauss and Sokal, 1966;Moore et al, 1970), other forms of malignant disease (Osserman and Takatsuki, 1963;Hallen, 1966;Causey, 1967;Hosley, 1967;Migliore and Alexanian, 1968), and some non-malignant diseases (Owen, Pitney and O'Dea, 1959;Waldenstrom, 1964;Michaux and Heremans, 1969;Kanoh, 1970). In view of the fact that M-components have been observed in patients with malignant diseases, it was decided to study their frequency in the sera of patients with histologically proven solid malignant neoplasms attending our Institute.…”