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The Journal of Immunology, Vol 127, Issue 5 1817-1822, Copyright © 1981 by American Association of Immunologists

ARTICLES

Natural cytotoxicity and interferon production in human cancer: deficient natural killer activity and normal interferon production in patients with advanced disease

AS Kadish, AT Doyle, EH Steinhauer and NA Ghossein

Natural cytotoxicity was measured in 51 adult patients with solid epithelial malignant tumors and in 27 normal subjects. Peripheral blood leukocytes (PBL) from 31% of the patients and 7% of the controls failed to kill target cells (K562) in a short-term chromium-release assay. When patients were classified according to clinical stage, PBL from 12% of patients with localized cancers, but 50% of patients with advanced disease, failed to exhibit cytotoxicity within the normal range. Pretreatment of PBL with interferon alpha (IFN alpha) or with Newcastle Disease Virus (NDV), a potent inducer of IFN alpha, enhanced cytotoxicity from all normal subjects. Of patients whose PBL lacked spontaneous cytotoxicity, half were able to kill normally after pretreatment of PBL with IFN alpha or NDV. Virtually all the patients whose PBL were unable to kill despite pretreatment with IFN alpha or virus had disseminated malignancies. IFN alpha production by PBL exposed to NDV and to K562 cells was normal in all the patients regardless of stage of disease or ability to kill K562 cells. The observed defect in natural cytotoxicity is thus unlikely to be due to a failure of PBL to produce IFN alpha.


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