Abstract
In search for clues to the potential immunomodulating mechanism of action of levamisole which might be used as monitoring parameters, we have determined a variety of cytokines in the peripheral blood of volunteers and carcinoma patients before and after a single or a 3-day-treatment with 150 mg/day. In cancer patients no changes could be detected 4 days after a 3-day-treatment course in the levels of TNF-alpha, IL-1beta, IL-2 or IL-6. In a placebo-controlled volunteer study the same treatment did not affect the levels of beta2-microglobulin, IL-1beta, IL-1alpha, IL-2 or IL-6. However, 24hr after the last treatment the concentration of neopterin was slightly but significantly increased and the concentration of soluble IL-2 receptors decreased. A single treatment failed to produce such an effect. It is suggested that the measurement of neopterin and soluble IL-2 receptors may provide useful information in future trials.
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