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GALLINGER, S; HOSKIN, S. W; MULLEN, J. B. M; WONG, A. H. C; RODER, J. C
Cancer research (Chicago, Ill.), 04/1990, Letnik: 50, Številka: 8Journal Article
An experimental model of hepatic metastases in C57BL/6 mice was used to compare the antitumor effects of lymphokine-activated killer (LAK) cells, anti-CD3-activated T-cells (ATC), and anti-CD3 alone. Liver metastases were produced by in vivo passage of MCA-38-LD adenocarcinoma via the ileocolic vein. LAK cells and ATC were generated by 3-day in vitro incubation of spleen cells in interleukin 2 and anti-CD3, respectively. Percentage of tumor volume in livers was determined with a morphometric technique. With less than therapeutic LAK cell doses (0.5-1.0 x 10(7) cells), no effect was seen in mean (+SE, -SE) percentage of tumor volume of control 23.3 (29.3, 18.5) compared to LAK cell-treated 21.6 (29.3, 15.9) animals. The same number of ATC significantly reduced the mean percentage of tumor volume 2.7 (4.7, 1.4) (P less than 0.005). High dose interleukin 2 also significantly decreased tumor volume. More strikingly, a single dose of anti-CD3 alone had a beneficial effect on mean percentage of tumor volume when given i.p. 1.0 (1.9, 0.4) or i.v. 1.2 (1.7, 0.7) (P less than 0.0003). A total of 33% of anti-CD3-treated mice had no detectable liver metastases. In 51Cr release assays, the cytotoxicity of ATC was shown to be partially mediated by nylon wool-adherent accessory cells. The effectiveness of anti-CD3 in this immunotherapy model suggests that a similar approach may be taken to immunotherapy of human malignancies, without the requirements for in vitro-generated killer cells or exogenously administered interleukin 2.
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