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Sex hormone associations with breast cancer risk and the mediation of randomized trial postmenopausal hormone therapy effects

Identifieur interne : 001358 ( Main/Exploration ); précédent : 001357; suivant : 001359

Sex hormone associations with breast cancer risk and the mediation of randomized trial postmenopausal hormone therapy effects

Auteurs : Shanshan Zhao [États-Unis] ; Rowan T. Chlebowski [États-Unis] ; Garnet L. Anderson [États-Unis] ; Lewis H. Kuller [États-Unis] ; Joann E. Manson [États-Unis] ; Margery Gass [États-Unis] ; Ruth Patterson [États-Unis] ; Thomas E. Rohan [États-Unis] ; Dorothy S. Lane [États-Unis] ; Shirley Aa Beresford [États-Unis] ; Sayeh Lavasani [États-Unis] ; Jacques E. Rossouw [États-Unis] ; Ross L. Prentice [États-Unis]

Source :

RBID : PMC:4053241

Abstract

Introduction

Paradoxically, a breast cancer risk reduction with conjugated equine estrogens (CEE) and a risk elevation with CEE plus medroxyprogesterone acetate (CEE + MPA) were observed in the Women’s Health Initiative (WHI) randomized controlled trials. The effects of hormone therapy on serum sex hormone levels, and on the association between baseline sex hormones and disease risk, may help explain these divergent breast cancer findings.

Methods

Serum sex hormone concentrations were measured for 348 breast cancer cases in the CEE + MPA trial and for 235 cases in the CEE trial along with corresponding pair-matched controls, nested within the WHI trials of healthy postmenopausal women. Association and mediation analyses, to examine the extent to which sex hormone levels and changes can explain the breast cancer findings, were conducted using logistic regression.

Results

Following CEE treatment, breast cancer risk was associated with higher concentrations of baseline serum estrogens, and with lower concentrations of sex hormone binding globulin. However, following CEE + MPA, there was no association of breast cancer risk with baseline sex hormone levels. The sex hormone changes from baseline to year 1 provided an explanation for much of the reduced breast cancer risk with CEE. Specifically, the treatment odds ratio (95% confidence interval) increased from 0.71 (0.43, 1.15) to 0.92 (0.41, 2.09) when the year 1 measures were included in the logistic regression analysis. In comparison, the CEE + MPA odds ratio was essentially unchanged when these year 1 measures were included.

Conclusions

Breast cancer risk remains low following CEE use among women having favorable baseline sex hormone profiles, but CEE + MPA evidently produces a breast cancer risk for all women similar to that for women having an unfavorable baseline sex hormone profile. These patterns could reflect breast ductal epithelial cell stimulation by CEE + MPA that is substantially avoided with CEE, in conjunction with relatively more favorable effects of either regimen following a sustained period of estrogen deprivation. These findings may have implications for other hormone therapy formulations and routes of delivery.

Trial registration

clinicaltrials.gov identifier: NCT00000611.


Url:
DOI: 10.1186/bcr3632
PubMed: 24670297
PubMed Central: 4053241


Affiliations:


Links toward previous steps (curation, corpus...)


Le document en format XML

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<name sortKey="Gass, Margery" sort="Gass, Margery" uniqKey="Gass M" first="Margery" last="Gass">Margery Gass</name>
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<name sortKey="Patterson, Ruth" sort="Patterson, Ruth" uniqKey="Patterson R" first="Ruth" last="Patterson">Ruth Patterson</name>
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<name sortKey="Rohan, Thomas E" sort="Rohan, Thomas E" uniqKey="Rohan T" first="Thomas E" last="Rohan">Thomas E. Rohan</name>
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<region type="state">État de New York</region>
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<name sortKey="Lane, Dorothy S" sort="Lane, Dorothy S" uniqKey="Lane D" first="Dorothy S" last="Lane">Dorothy S. Lane</name>
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<region type="state">Michigan</region>
</placeName>
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<title>Introduction</title>
<p>Paradoxically, a breast cancer risk reduction with conjugated equine estrogens (CEE) and a risk elevation with CEE plus medroxyprogesterone acetate (CEE + MPA) were observed in the Women’s Health Initiative (WHI) randomized controlled trials. The effects of hormone therapy on serum sex hormone levels, and on the association between baseline sex hormones and disease risk, may help explain these divergent breast cancer findings.</p>
</sec>
<sec>
<title>Methods</title>
<p>Serum sex hormone concentrations were measured for 348 breast cancer cases in the CEE + MPA trial and for 235 cases in the CEE trial along with corresponding pair-matched controls, nested within the WHI trials of healthy postmenopausal women. Association and mediation analyses, to examine the extent to which sex hormone levels and changes can explain the breast cancer findings, were conducted using logistic regression.</p>
</sec>
<sec>
<title>Results</title>
<p>Following CEE treatment, breast cancer risk was associated with higher concentrations of baseline serum estrogens, and with lower concentrations of sex hormone binding globulin. However, following CEE + MPA, there was no association of breast cancer risk with baseline sex hormone levels. The sex hormone changes from baseline to year 1 provided an explanation for much of the reduced breast cancer risk with CEE. Specifically, the treatment odds ratio (95% confidence interval) increased from 0.71 (0.43, 1.15) to 0.92 (0.41, 2.09) when the year 1 measures were included in the logistic regression analysis. In comparison, the CEE + MPA odds ratio was essentially unchanged when these year 1 measures were included.</p>
</sec>
<sec>
<title>Conclusions</title>
<p>Breast cancer risk remains low following CEE use among women having favorable baseline sex hormone profiles, but CEE + MPA evidently produces a breast cancer risk for all women similar to that for women having an unfavorable baseline sex hormone profile. These patterns could reflect breast ductal epithelial cell stimulation by CEE + MPA that is substantially avoided with CEE, in conjunction with relatively more favorable effects of either regimen following a sustained period of estrogen deprivation. These findings may have implications for other hormone therapy formulations and routes of delivery.</p>
</sec>
<sec>
<title>Trial registration</title>
<p>clinicaltrials.gov identifier:
<ext-link ext-link-type="uri" xlink:href="http://www.clinicaltrials.gov/">NCT00000611</ext-link>
.</p>
</sec>
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<name sortKey="Zhao, Shanshan" sort="Zhao, Shanshan" uniqKey="Zhao S" first="Shanshan" last="Zhao">Shanshan Zhao</name>
</noRegion>
<name sortKey="Anderson, Garnet L" sort="Anderson, Garnet L" uniqKey="Anderson G" first="Garnet L" last="Anderson">Garnet L. Anderson</name>
<name sortKey="Beresford, Shirley Aa" sort="Beresford, Shirley Aa" uniqKey="Beresford S" first="Shirley Aa" last="Beresford">Shirley Aa Beresford</name>
<name sortKey="Chlebowski, Rowan T" sort="Chlebowski, Rowan T" uniqKey="Chlebowski R" first="Rowan T" last="Chlebowski">Rowan T. Chlebowski</name>
<name sortKey="Gass, Margery" sort="Gass, Margery" uniqKey="Gass M" first="Margery" last="Gass">Margery Gass</name>
<name sortKey="Kuller, Lewis H" sort="Kuller, Lewis H" uniqKey="Kuller L" first="Lewis H" last="Kuller">Lewis H. Kuller</name>
<name sortKey="Lane, Dorothy S" sort="Lane, Dorothy S" uniqKey="Lane D" first="Dorothy S" last="Lane">Dorothy S. Lane</name>
<name sortKey="Lavasani, Sayeh" sort="Lavasani, Sayeh" uniqKey="Lavasani S" first="Sayeh" last="Lavasani">Sayeh Lavasani</name>
<name sortKey="Manson, Joann E" sort="Manson, Joann E" uniqKey="Manson J" first="Joann E" last="Manson">Joann E. Manson</name>
<name sortKey="Patterson, Ruth" sort="Patterson, Ruth" uniqKey="Patterson R" first="Ruth" last="Patterson">Ruth Patterson</name>
<name sortKey="Prentice, Ross L" sort="Prentice, Ross L" uniqKey="Prentice R" first="Ross L" last="Prentice">Ross L. Prentice</name>
<name sortKey="Rohan, Thomas E" sort="Rohan, Thomas E" uniqKey="Rohan T" first="Thomas E" last="Rohan">Thomas E. Rohan</name>
<name sortKey="Rossouw, Jacques E" sort="Rossouw, Jacques E" uniqKey="Rossouw J" first="Jacques E" last="Rossouw">Jacques E. Rossouw</name>
</country>
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