Overexpression of HER-2 as a resistance mechanism to hormonal therapy for breast cancer.

Abstract:

:Hormonal therapy leads to improved survival in oestrogen receptor (ER) positive early breast cancer and long-term responses in advanced disease. However, resistance to such therapy is a serious clinical problem. This article considers the data for and against there being a significant role for the oncogene HER-2 in such resistance. Transfection of HER-2 into MCF-7 cells leads to resistance to tamoxifen but data differ in relation to the oestrogen dependence of such cells. A number of retrospective studies have been conducted of HER-2 status in adjuvant trials of tamoxifen. Most of these also suggest a negative role but individually the studies do not have the statistical power to be conclusive. Recent studies in the neoadjuvant context have shown a significant antiproliferative effect of endocrine therapy in HER-2 positive/ER positive tumours but this is much less than in HER-2 negative/ER positive tumours. It is concluded that incomplete hormonal resistance results from co-expression of HER-2 and ER and that this may differ between different hormonal agents.

journal_name

Endocr Relat Cancer

journal_title

Endocrine-related cancer

authors

Dowsett M

doi

10.1677/erc.0.0080191

subject

Has Abstract

pub_date

2001-09-01 00:00:00

pages

191-5

issue

3

eissn

1351-0088

issn

1479-6821

journal_volume

8

pub_type

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