EP1: A novel rabbit monoclonal antibody for detection of oestrogen receptor α

Sunil Badve, Tudor Vladislav, Betsy Spaulding, Anna Strickland, Sylvia Hernandez, Lisa Bird-Turner, Cecelia Dodson, Bjorn Elleby, Therese Phillips

Research output: Contribution to journalArticle

9 Scopus citations


Aims: Assessment of hormone receptor expression is part of routine examination of every breast cancer. In this study, we report the characterisation of a novel rabbit monoclonal antibody, clone EP1, directed against oestrogen receptor (ER) α. Additionally, its immunohistochemical performance characteristics in archival tissues are evaluated in normal tissues and two distinct cohorts of breast cancer patients. Methods: Comparative analyses between EP1 and the anti-ERα component of the ER/PR pharmDx kit (cocktail of mouse monoclonal antibody clones 1D5 and ER-2-123) and between EP1 and another commercially available rabbit monoclonal antibody, clone SP1, are described. Results: Clone EP1 specifically detects nuclear ER in all tissues examined; cytoplasmic staining was not observed. The analysis shows a high degree of concordance (∼95%) between EP1 and both the ERα component of the Dako ER/PR pharmDx kit and Ventana clone SP1. However, the use of EP1 antibody together with Dako EnVision FLEX detection system resulted in a stronger staining intensity as compared with SP1 antibody using the Ventana ultraView DAB detection system resulting in better 'ease of use.' Conclusions: The use of EPI can result in better interpretation of the results of the ER analysis.

Original languageEnglish (US)
Pages (from-to)1051-1057
Number of pages7
JournalJournal of Clinical Pathology
Issue number12
StatePublished - Dec 1 2013


ASJC Scopus subject areas

  • Pathology and Forensic Medicine

Cite this

Badve, S., Vladislav, T., Spaulding, B., Strickland, A., Hernandez, S., Bird-Turner, L., Dodson, C., Elleby, B., & Phillips, T. (2013). EP1: A novel rabbit monoclonal antibody for detection of oestrogen receptor α. Journal of Clinical Pathology, 66(12), 1051-1057. https://doi.org/10.1136/jclinpath-2012-201391