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Abstract. Were researched IgG on the surface cells of different histological types tumors of cerebrum, using fluorescing staphylococcus A-protein. The study of target IgG shows divers intensive of microscopic fluorescent illumination. This results associate related with level amount IgG. The maximum concentrate of surface’s IgG was on the cells of malignant tumors and there was direct correlate with aggressive manner and quickly recurrence of tumor’s growth, and shot survival. The fraction of IgG with specific antitumor’s antibody covers tumor’s antigens has been block this antigens for receptors of T-lymphocytes. Linked with immunological anticell’s deficit phenomenon may be one from famous reasons of malignant clinical type tumor disease. (Med. Immunol., vol. 10, N 6, pp 593-596).