Abstract
Numerous lines of evidence demonstrate that breast cancer is immunogenic; yet, there are few biologically relevant immune targets under investigation restricting the exploration of vaccines to limited breast cancer subtypes. Insulin-like growth factor-I receptor (IGF-IR) is a promising vaccine candidate since it is overexpressed in most breast cancer subtypes, is part of a dominant cancer growth pathway, and has been validated as a therapeutic target. We questioned whether IGF-IR was immunogenic in cancer patients. IGF-IR-specific IgG antibodies were significantly elevated in early-stage breast cancer patients at the time of diagnosis as compared to volunteer donors (p = 0.04). Predicted T-helper epitopes, derived from the IGF-IR extracellular and transmembrane domains, elicited a significantly higher incidence of Th2 immunity in breast cancer patients as compared to controls (p = 0.01). Moreover, the magnitude of Th2 immunity was greater in breast cancer patients compared to controls (p = 0.02). In contrast, both breast cancer patients and volunteer donors demonstrated a similar incidence of Th1 immunity to IGF-IR domains with the predominant response directed against epitopes in the intracellular domain of the protein. As the incidence of IGF-IR type I immunity was not associated with a breast cancer diagnosis, we questioned whether other factors were contributing to the presence of IGF-IR-specific T-cells in both populations. While age was not associated with Th1 immunity, we observed a significantly greater magnitude of IGF-IR IFN-γ-secreting T-cells in obese subjects as compared to overweight (p < 0.001) or healthy-weight (p = 0.006) subjects, regardless of breast cancer diagnosis. No significant difference was observed for Th2 incidence or magnitude when stratified by age (p = 0.174, p = 0.966, respectively) or body mass index (p = 0.137, p = 0.174, respectively). Our data demonstrate that IGF-IR is a tumor antigen and IGF-IR-specific Th1 immunity may be associated with obesity rather than malignancy.
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Acknowledgments
This work was supported by a grant from the Ovarian Cancer Research Fund, 17624550-36370-A, and a Department of Defense Postdoctoral Fellowship, W81XWH-10-1-0700. MLD is supported by the Athena Distinguished Professorship of Breast Cancer Research.
Conflict of Interest
MLD discloses funding received from Seattle Genetics, stock ownership in VentiRx and Epigenomics AG, and a consultant/advisory role at VentiRx and EMD Serono. All other authors disclose no conflict of interest.
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Cecil, D.L., Park, K.H., Gad, E. et al. T-helper I immunity, specific for the breast cancer antigen insulin-like growth factor-I receptor (IGF-IR), is associated with increased adiposity. Breast Cancer Res Treat 139, 657–665 (2013). https://doi.org/10.1007/s10549-013-2577-z
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DOI: https://doi.org/10.1007/s10549-013-2577-z