Abstract
The incidence and clinical significance of therapy-induced neutralizing interferon β (IFNß) antibodies was studied in a group of 21 melanoma patients treated with natural IFNß and 7 patients treated with recombinant IFNß. They were treated subcutaneously with 3×106 IU three times per week in an adjuvant open trial for 24 weeks after surgical removal of all detectable metastases. Of the 21 patients treated with natural IFNß, 95% developed significant levels of neutralizing antibodies after 24 weeks. In comparison, 28% of the 7 patients treated with recombinant IFNß developed neutralizing IFNß antibodies. Cross-reactivity of the antibodies could be demonstrated. Persistence of antibody titers was seen in 80% of the patients 24 weeks after cessation of treatment with natural IFNß. No correlation between the maximum antibody titers and the antibody persistence after cessation of therapy could be established. We detected a clear correlation between the formation of neutralizing antibodies and the decrease in β2-microglobulin and 2′,5′-oligoadenylate synthease and therefore the drop in biological activity. In this adjuvant trial there was no difference in relapse rate and time until relapse between antibody-positive and antibody-negative patients. No difference in clinical outcome could be established between the patients treated with natural IFNß and recombinant IFNß.
Key words: Melanoma, Interferon β, Antibodies, Adjuvant trial
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