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Aromatase within the breast.

W Yue¹, R J Santen, J P Wang

¹Department of Internal Medicine, University of Virginia School of Medicine, Charlottesville 22908, USA.

Endocrine-Related Cancer

|March 24, 2000

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In situ aromatase activity, not plasma uptake, drives high estradiol levels in postmenopausal breast tumors. Blocking this aromatase may benefit patients, especially those with relapsed estrogen-sensitive breast cancer.

Area of Science:

Endocrinology
Oncology
Molecular Biology

Background:

High estradiol concentrations in postmenopausal breast tumors may result from in situ aromatization or enhanced plasma uptake.
Understanding these mechanisms is crucial for developing effective breast cancer therapies.

Purpose of the Study:

To determine the relative importance of in situ aromatization versus plasma uptake in maintaining tumor estradiol levels in postmenopausal breast cancer.
To evaluate the impact of these mechanisms on tumor growth rate.

Main Methods:

Established a nude mouse model by inoculating aromatase (A+) or sham (A-) transfected MCF-7 cells into ovariectomized mice.
Simulated postmenopausal hormonal status using estradiol Silastic implants to maintain plasma estradiol levels at 5-20 pg/ml.

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Main Results:

In situ aromatization was identified as the primary determinant of tumor estradiol levels and growth rate.
Long-term estrogen deprivation increased MCF-7 cell sensitivity to estradiol and enhanced aromatase activity.

Conclusions:

Intratumoral aromatase activity is the key factor in maintaining high estradiol levels within breast tumors in postmenopausal patients.
Complete blockade of in situ aromatization could offer significant therapeutic benefits for postmenopausal breast cancer patients, particularly those with resistance to antiestrogen therapy.