Tumor development of poorly immunogenic LLC and B16F10 cells modified to produce GM-CSF was markedly inhibited. Tumor development of poorly immunogenic.

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Tumor development of poorly immunogenic LLC and B16F10 cells modified to produce GM-CSF was markedly inhibited. Tumor development of poorly immunogenic LLC and B16F10 cells modified to produce GM-CSF was markedly inhibited. A, dose-escalation studies to assess GM-CSF production from LLC/SeV/GM cells (MOI = 0, 3, 10, and 100). GM-CSF production levels in the supernatants from the 48-hour culture were measured by ELISA. B and C, tumorigenicity assays using LLC cells. B, a total of 3.0 × 105 LLC and LLC/SeV/GM (MOI of 1, 10, or 100) cells were subcutaneously inoculated into the right flank of C57/BL6N mice (n = 3). C, a total of 2.0 × 105 LLC, LLC/SeV/GFP, or LLC/SeV/GM (MOI = 100) cells were inoculated into the right flank of C57/BL6N mice (n = 6). Significant tumor regression (left) and prolonged survival (right) was shown in mice treated with LLC/SeV/GM cells. D, tumorigenicity assays using B16F10 cells. In total, 1.0 × 105 B16F10, B16/SeV/GFP, or B16/SeV/GM (MOI = 30) cells were inoculated into the right flanks of C57/BL6N mice (n = 6). Significant tumor regression (left) and prolonged survival (right) were observed in mice treated with B16/SeV/GM cells. The asterisks indicate statistically significant differences (*, P < 0.05; **, P < 0.01; ***, P < 0.001). Kaplan–Meier survival curves are shown, and mortality was determined by the log-rank test (LLC vs. LLC/SeV/GM and LLC/SeV/GFP vs. LLC/SeV/GM; P < 0.001, LLC vs. LLC/SeV/GFP; P = 0.67, B16 vs. B16/SeV/GM and B16/SeV/GFP vs. B16/SeV/GM; P < 0.05). Megumi Narusawa et al. Cancer Immunol Res 2014;2:568-580 ©2014 by American Association for Cancer Research