Murine leukemic cells, after in vivo treatment with antineoplastic drugs, have been shown to express new antigenic specificities that were not detectable on parental cells and that were heritable after the withdrawal of drug treatment. A study was conducted of macrophage antitumor activity triggered by LY/DTIC cells, a subline of LY murine lymphoma, antigenically altered by the drug DTIC. In vitro non-specific inhibition of tumor cell growth was exhibited by spleen and peritoneal macrophages from mice previously challenged with viable LY/DTIC. Peritoneal macrophages from LY/DTIC immune animals showed moderate, although significant lytic activity against unrelated tumor target cells. Supernatants from mixed lymphocyte-tumor cell cultures, in which LY/DTIC immune lymphocytes and LY/DTIC tumor cells had been cultured, rendered normal macrophages non-specifically growth inhibitory for tumor cells.
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