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Phase-I study of intravenous modified lipid A

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Summary

Endotoxin and the lipid-A portion of the molecule have a variety of biological effects, including the induction of necrosis and regression of malignancy. To date extensive clinical trials of endotoxin as a potential therapeutic agent have been shunned due to the toxicity of the material.

Several lipid-A analogues have been described which have reduced toxicity and retain antitumor activity. We have investigated in a phase-I trial the clinical toxicity and immunological effects of monophosphoryl lipid A prepared from Salmonella typhimurium and Salmonella minnesota.

Patients entered on the study received IV monophosphoryl lipid A twice weekly for a total of 4 weeks. At least three patients were entered sequentially at each of the dose levels of 10, 25, 50, 100, and 250 μg/m2 body surface area. One patient was treated at the dose level of 500 μg/m2. The major clinical toxicity was fever, chills, and rigor, which occurred in over 50% of the treatments at doses of 250 μg/m2. Two instances of bronchospasm occurred in one patient who received 250 μg/m2. One patient received 500 μg/m2 and became hypotensive.

Sequential clinical data showed no evidence of renal or hepatic toxicity. A transient decrease in the WBC and platelets occurred during the first 24 h after therapy. Immune function testing measured T cells, monocyte cytostasis, monocyte suppressor cell activity, and NK activity. These data suggested a shift in monocyte populations with activated cells moving into the tissue.

Direct objective antitumor activity or necrosis was not observed in this group of patients. We conclude that monophosphoryl lipid A can be given to patients in a dose of up to 100 μg/m2 with acceptable toxicity. Its clinical activity as a single agent in combination with other immunomodulators remains to be demonstrated.

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Correspondence to Gerald J. Vosika.

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Vosika, G.J., Barr, C. & Gilbertson, D. Phase-I study of intravenous modified lipid A. Cancer Immunol Immunother 18, 107–112 (1984). https://doi.org/10.1007/BF00205743

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Keywords

  • Dose Level
  • Antitumor Activity
  • Body Surface Area
  • Suppressor Cell
  • Direct Objective