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Open Access Research

The Eag potassium channel as a new prognostic marker in ovarian cancer

Viren Asher1*, Raheela Khan1, Averil Warren1, Robert Shaw1, Gerhard V Schalkwyk2, Anish Bali3 and Heidi M Sowter4

Author Affiliations

1 Department of Obstetrics and Gynaecology, School of Graduate Entry Medicine and Health, Royal Derby Hospital, Uttoxeter Road, Derby DE22 3DT, UK

2 Department of Pathology, Royal Derby Hospital, Uttoxeter Road, Derby DE22 3NE, UK

3 Department of Gynaecological Oncology, Royal Derby Hospital, Uttoxeter Road, Derby DE22 3NE, UK

4 Dept of Biology, Forensics and Sport, University of Derby, Kedleston Road, Derby DE22 1GB

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Diagnostic Pathology 2010, 5:78  doi:10.1186/1746-1596-5-78

Published: 7 December 2010

Abstract

Background

Ovarian cancer is the second most common cancer of the female genital tract in the United Kingdom (UK), accounting for 6% of female deaths due to cancer. This cancer is associated with poor survival and there is a need for new treatments in addition to existing chemotherapy to improve survival. Potassium (K+) channels have been shown to be overexpressed in various cancers where they appear to play a role in cell proliferation and progression.

Objectives

To determine the expression of the potassium channels Eag and HERG in ovarian cancer tissue and to assess their role in cell proliferation.

Methods

The expression of Eag and HERG potassium channels was examined in an ovarian cancer tissue microarray. Their role in cell proliferation was investigated by blocking voltage-gated potassium channels in an ovarian cancer cell line (SK-OV-3).

Results

We show for the first time that high expression of Eag channels in ovarian cancer patients is significantly associated with poor survival (P = 0.016) unlike HERG channel expression where there was no correlation with survival. There was also a significant association of Eag staining with high tumour grade (P = 0.014) and presence of residual disease (P = 0.011). Proliferation of SK-OV-3 cells was significantly (P < 0.001) inhibited after treatment with voltage gated K+ channel blockers.

Conclusion

This novel finding demonstrates a role for Eag as a prognostic marker for survival in patients with ovarian cancer.