Abstract
NY-BR-1 is a recently identified differentiation antigen of the mammary gland. To use NY-BR-1 for T-cell-based immunotherapy, analysis of its co-expression with HLA class I antigens is required. In the present tissue microarray study, primary breast cancers (n = 1,444), recurrences (n = 88), lymph node (n = 525) and distant metastases (n = 91) were studied for NY-BR-1 expression using a novel monoclonal antibody. NY-BR-1 expression was compared with prognosis, estrogen receptor, HER2-status, EGFR and HLA class I antigen expression. NY-BR-1 was more frequently expressed in grade 1 (82%) than in grade 2 (69%) and grade 3 (46%) carcinomas (P < 0.0001). Moreover, NY-BR-1 expression correlated directly with estrogen receptor expression (P < 0.0001) and inversely correlated with HER2-status and EGFR expression (P < 0.0001 for both). Considering high expression level of co-expression, 198/1,321 (15%) primary breast carcinomas and 4/65 (6%) distant metastases expressed NY-BR-1 and HLA class I, suggesting that active immunotherapy can be applied to about 10% of breast cancer patients. Survival analysis showed an association of NY-BR-1 expression with better patient outcome (P = 0.015). No difference between NY-BR-1 expression of primary tumors and metastases could be found, indicating that the presence of NY-BR-1 in metastases can be deduced from their corresponding primary. Forty-three paired biopsies taken from patients before and after chemotherapy suggest that NY-BR-1 expression is not influenced by preceding chemotherapy (κ = 0.89, P < 0.0001). In summary, the co-expression of NY-BR-1 with HLA class I antigens and its expression in metastases without modification by chemotherapy suggest that NY-BR-1 targeted immunotherapy represents a viable strategy in addition to other targeted cancer drug therapies of breast cancer.
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Acknowledgments
The skillful technical assistance of S. Bingge, and S. Behnke is greatly appreciated. The authors wish to thank N. Wey for his help in preparing the photographical illustrations and M. Aerne for supporting database programming. This study was partly supported by grants from LICR/CRI (Cancer Vaccine Collaborative, Cancer Antigen Discovery Collaborative), Claudia von Schilling Foundation for Breast Cancer Research, UBS AG Switzerland (made possible by an anonymous donor), Stiftung für die Forschung in der Onkologie and by PHS grants R01CA 67108 and R01CA 113861 awarded by the National Cancer Institute, DHHS. J. -Ph. Theurillat is supported by a grant form the “Gertrud-Hagmann-Stiftung für Malignomforschung”. The authors do not have potential financial or personal conflicts of interest.
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Jean-Philippe Theurillat and Ursina Zürrer-Härdi contributed equally to this study.
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Theurillat, JP., Zürrer-Härdi, U., Varga, Z. et al. NY-BR-1 protein expression in breast carcinoma: a mammary gland differentiation antigen as target for cancer immunotherapy. Cancer Immunol Immunother 56, 1723–1731 (2007). https://doi.org/10.1007/s00262-007-0316-1
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DOI: https://doi.org/10.1007/s00262-007-0316-1