Abstract
We investigated the in vitro effects of famotidine on the cytotoxic activity of peripheral blood mononuclear cells (PBMC) and tumor-infiltrating lymphocytes (TILs). The cytotoxic activity of PBMC was augmented by famotidine at a concentration of 10 ng/ml, which is equivalent to the serum level achieved by the intravenous administration of a dose of 20 mg. This response to famotidine was seen only in cancer patients. Both the cytotoxic activity and DNA synthesis of activated TILs were increased by the combination of interleukin-2 and 1 μg/ml of famotidine. Augmentation of cytotoxic activity by famotidine occurred independently of any decrease in the population of suppressor T-cells. Thus, famotidine may have the potential to be used in adoptive immunotherapy with TILs for cancer patients.
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