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ATTENTION has recently been drawn to the possible significance within tumours of cells with the biological characteristics of macrophages (Russell et al., 1976; Evans, 1977; Wood & Gollahon, 1977) including cells bearing receptors for IgGcoated erythrocytes (Fe receptors) (Milgrom et al., 1968; T0nder & Thunold, 1973; Kerbel & Davies, 1974). It has been suggested that the incidence of these cells withintumoursmaybear a relationship both to the host's immunological response, and to the growth, immunogenicity and metastatic spread of the tumour (Evans, 1972; Eccles & Alexander, 1974a; Kerbel et al., 1975; Russell et al., 1976). The immune response is markedly affected by agents which influence macrophage activity (Halpern et al., 1964; Fowler & Thomson, 1978) such as C. parvum (Scott, 1974) and carrageenan (Thomson, 1978) and which have profound effects on tumour growth (Milas & Scott, 1978; Thomson & Fowler, 1977; Keller, 1976). In this preliminary study we have attempted to determine whether the influences of C. parvum and carrageenan on the growth of a transplantable syngeneic tumour are reflected in the proportions of Fc-receptor-positive and phagocytic cells within the tumour. Eight to 12-week-old inbred female C3H He Mg mice derived from stock obtained from Bantin & Kingman Ltd, Grimston, Aldborough, Yorkshire, and weighing 20-25 g were used throughout. Accepted 5 February 1979

Fc receptor-bearing and phagocytic cells in syngeneic tumours of C. parvum- and carrageenan-treated mice