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Expression of estrogen receptor variants

S A Fuqua¹, D C Allred, R J Auchus

¹University of Texas Health Science Center, Department of Medicine, San Antonio 78284.

Journal of Cellular Biochemistry. Supplement

|January 1, 1993

Summary

Estrogen receptor (ER) variants, like the exon 5 variant, may drive antiestrogen resistance in breast cancer. Their expression levels alongside wild-type ER influence treatment response and metastasis.

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Area of Science:

Oncology
Molecular Biology
Endocrinology

Background:

Estrogen receptor (ER) variants are increasingly recognized in clinical breast cancer.
Coexpression of ER variants with wild-type ER complicates their functional significance.
A specific ER variant lacking exon 5 is unable to bind hormone.

Purpose of the Study:

To investigate the role of the exon 5 ER variant in antiestrogen resistance.
To explore the impact of ER variant coexpression on breast cancer cell behavior.

Main Methods:

Utilized MCF-7 human breast cancer cells for experimental models.
Analyzed ER variant expression in metastatic breast cancer lesions.
Studied the effect of exon 5 ER variant coexpression with wild-type ER on tamoxifen response.

Main Results:

Coexpression of the exon 5 ER variant with wild-type ER in MCF-7 cells conferred resistance to tamoxifen.
Overexpression of exon 5 ER deletional variant transcripts was observed in some metastatic breast lesions.

Conclusions:

The exon 5 ER variant may contribute to clinical antiestrogen resistance.
Relative expression levels of ER variants interact to determine hormonal responsiveness and metastatic potential in breast cancer.

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