Summary
Immunopotentiation by cytostatic drugs continuously released from osmotic minipumps, was investigated in a guinea-pig contact-sensitivity model. These pumps are designed to release their content within a period of 7 days. Vepesid (VP-16) and 5-fluorouracil were released into oxazolone-stimulated lymph nodes by subcutaneous implantation of pumps containing either of these drugs. The pumps were implanted at the intended sensitization site, 2 days before sensitization. Strong potentiation of T-cell-mediated immunity, evaluated by delayed-type hypersensitivity measurements, was observed with both drugs tested. Daily injections with VP-16 also caused an enhancement of the immune response. However, daily injections with 5-fluorouracil, a drug assumed to be cell-cycle-specific in its action, failed to potentiate delayed hypersensitivity to oxazolone. Intralesional administration of cytostatic drugs has been put forward as an effective treatment modality in various types of cancer. Therapeutic effects may depend on both local tumorcytotoxic and immunopotentiating activities. Our present results suggest that osmotic minipumps can be applied to broaden the applicability and effectiveness of local chemotherapy.
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Claessen, A.M.E., Valster, H., Bril, H. et al. Cell-mediated immunity is enhanced by cytostatic drugs continuously released at the site of antigenic stimulation. Cancer Immunol Immunother 28, 131–135 (1989). https://doi.org/10.1007/BF00199113
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DOI: https://doi.org/10.1007/BF00199113