Antitumor effect of locally injected low doses of recombinant human interleukin-2 in bovine vulval papilloma and carcinoma

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Abstract

In many human clinical trials and in various animal tumor models, the antitumor effect of high doses of systemically applied interleukin-2 (IL-2) is tested. Our studies focused on the effects of low doses of locally injected IL-2. In this paper, the effect of local injection of low doses of IL-2, i.e. a total dose of 25 000–50 000 units, into papillomas or carcinomas of the bovine vulva is described. In 19 out of 23 (83%) cows treated with IL-2 an effect on the tumor load was observed; in three of these animals, complete regression was obtained. In the majority of cases, regression was not restricted to the tumors injected with IL-2.

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