?Activated? monocytes in gastric cancer patients

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Abstract
The spontaneous nitro-blue tetrazolium (NBT) reduction of monocytes from patients with gastric cancer was assessed and compared with an in vitro monocyte-mediated cytostasis of tumor cell lines and their suppressor activity. The increased NBT reduction correlated with the ability of monocytes to inhibit mitogen-induced normal lymphocyte response and cytostatic activity against L-1210 murine lymphoma cell line. These observations suggest that “activated” monocytes of some cancer patients may play the role of suppressor cells and exert an anti-tumor effect in vitro.