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Experimental Oncology D. Istituto Nazionale Tumori, Via Venezian 1, 20133 Milan [M. V., M. R., M. P., C. M., G. P., M. P. C.], and Consiglio Nazionale delle Ricerche-Centro Istocompatibilitá e Oncologia Sperimentale, Via Santena 19, 10126 Turin [F. C., G. F.], Italy
The purpose of these studies was to determine whether systemic administration of recombinant interleukin 12 (rIL-12) is able to potentiate an initial, but insufficient T-cell antitumor response. Mice challenged with carcinoma cells engineered to release interleukin 2 (IL-2) and displaying such a response received single or multiple i.p. injections of rIL-12. This combination of systemic rIL-12 and local IL-2 increased the percentage of mice that rejected two different IL-2 gene-transduced tumors. In another set of experiments more closely resembling a clinical situation, IL-2 gene-transduced tumors were used as vaccines in an attempt to cure mice bearing wild-type parental tumors. The combination of these vaccines with systemic rIL-12 cured mice more effectively than rIL-12 and IL-2 gene-transduced tumor vaccines alone.
1 This work was supported by the Italian Association for Cancer Research (AIRC) Special Program on Gene Therapy and by grants from Consiglio Nazionale delle Ricerche Target Project ACRO.
2 To whom requests for reprints should be addressed. Phone: (+39) 2-2390252; Fax: (+39) 2-2362692.
Received 11/ 3/95. Accepted 12/13/95.
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