Abstract
The clinical toxicity of acetic acid-treated "Salmonella minnesota" R595 (Re) organisms was evaluated in 24 cancer patients. Bacteria were injected i.v. four times at increasing doses for a total of 6.5 micrograms. This therapeutic regimen was free of major side effects (one patient had fever higher than 38 degrees C and 10 patients complained of pruritus). Furthermore, this bacterial preparation which possesses a more exposed lipid A on its surface, exhibited immunomodulating capacities in that it normalized the inverted T helper/T suppressor ratio and enhanced natural killer activity in tumor patients. The mechanisms of the lower toxicity and immunomodulating activities of these bacteria compared to other lipid A preparations are discussed.
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