Abstract
Overexpression of ErbB-2/neu occurs in 20–30% of patients with breast cancer and indicates a poor prognosis. The presence of a detectable immune response to ErbB-2/neu in some patients suggests that this oncogene may be a useful target for vaccine therapy. We evaluated whether genetic immunization using dendritic cells (DC) transduced ex vivo with an adenovirus expressing the ErbB-2/neu gene (AdNeuTK) could induce protective and therapeutic immunity against a breast tumor cell line overexpressing ErbB-2/neu. Subcutaneous (s.c.) immunization with the DC vaccine elicited protective immunity in an average of 60% of animals. CTL analysis demonstrated specific cytotoxic activity against breast tumor cells, as well as syngeneic fibroblasts transduced with AdNeuTK. In vivo depletion studies demonstrated both CD4+ and CD8+ T cells were required. In a therapeutic setting, immunization with the DC vaccines could cure mice with pre-established tumors and efficacy was further enhanced by cotransducing DCs with a vector expressing murine IL-12 (AdmIL-12). These studies support DC vaccines as a therapeutic strategy for human breast cancer, while emphasizing the importance of optimizing an immune response by combining tumor antigen presentation with immunostimulatory cytokines.
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Acknowledgements
We thank Duncan Chong, Xueya Feng and Chunyan Li for their expert technical assistance, and Dr Jonathan Bramson for critical reading of the manuscript. This work was supported in part by funds from the Breast Cancer Society of Canada, the Medical Research Council of Canada (MRC), the Hamilton Health Science Corporation and the St Joseph's Hospital.
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Chen, Y., Emtage, P., Zhu, Q. et al. Induction of ErbB-2/neu-specific protective and therapeutic antitumor immunity using genetically modified dendritic cells: enhanced efficacy by cotransduction of gene encoding IL-12. Gene Ther 8, 316–323 (2001). https://doi.org/10.1038/sj.gt.3301396
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DOI: https://doi.org/10.1038/sj.gt.3301396
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