Session I. Role of tumor macrophages in Vivo / William Regelson -- Session II. Macrophage function and interaction / Dolph O. Adams -- Session III. Mechanisms of macrophage mediated cytotoxicity / D. Bernard Amos -- The macrophage as a tumoricidal effector cell: a review in Vivo and In Vitro, Studies on the mechanism of the activated macrophage nonspecific cytotoxic reaction / John B. Hibbs, Jr. -- Morphologic aspects of tumor cell cytotoxicity by effector cells of the macrophage-histocyte compartment: in Vitro and in Vivo studies in BCG-mediated tumor regression / M.G. Hanna [and others] -- Session IV. Functional expression of macrophages and neoplasia / Osias Stutman -- The employment of Glucan and glucan activated macrophages in the enhancement of host resistance to malignancies in experimental animals / N.R. DiLuzio [and others] -- Session V. Stimulation of macrophage function and applied therapy / Ole A. Holtermann -- The in Vivo destruction of human tumor by glucan activated macrophages / Peter W.A. Mansell and Nicholas R. DiLuzio -- Macrophage deficiency in tumor bearing animals: control of experimental metastasis with macrophages activated in Vitro / I.J. Fidler.