Abstract
Background
Models that predict the risk of estrogen receptor (ER)-positive breast cancers may improve our ability to target chemoprevention. We investigated the contributions of sex hormones to the discrimination of the Breast Cancer Surveillance Consortium (BCSC) risk model and a polygenic risk score comprised of 83 single nucleotide polymorphisms.
Methods
We conducted a nested case-control study of 110 women with ER-positive breast cancers and 214 matched controls within a mammography screening cohort. Participants were postmenopausal and not on hormonal therapy. The associations of estradiol, estrone, testosterone, and sex hormone binding globulin with ER-positive breast cancer were evaluated using conditional logistic regression. We assessed the individual and combined discrimination of estradiol, the BCSC risk score, and polygenic risk score using the area under the receiver operating characteristic curve (AUROC).
Results
Of the sex hormones assessed, estradiol (OR 3.64, 95% CI 1.64–8.06 for top vs bottom quartile), and to a lesser degree estrone, was most strongly associated with ER-positive breast cancer in unadjusted analysis. The BCSC risk score (OR 1.32, 95% CI 1.00–1.75 per 1% increase) and polygenic risk score (OR 1.58, 95% CI 1.06–2.36 per standard deviation) were also associated with ER-positive cancers. A model containing the BCSC risk score, polygenic risk score, and estradiol levels showed good discrimination for ER-positive cancers (AUROC 0.72, 95% CI 0.65–0.79), representing a significant improvement over the BCSC risk score (AUROC 0.58, 95% CI 0.50–0.65).
Conclusion
Adding estradiol and a polygenic risk score to a clinical risk model improves discrimination for postmenopausal ER-positive breast cancers.
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Abbreviations
- AUROC:
-
Area under the receiver operating characteristic curve
- BCSC:
-
Breast Cancer Surveillance Consortium
- BI-RADS:
-
Breast Imaging Reporting and Data System
- BMI:
-
Body mass index
- CCR:
-
California Cancer Registry
- CPMC:
-
California Pacific Medical Center
- GWAS:
-
Genome-wide association study
- LR:
-
Likelihood ratio
- OR:
-
Odds ratio
- PRS:
-
Polygenic risk score
- SFMR:
-
San Francisco Mammography Registry
- SHBG:
-
Sex hormone binding globulin
- SNPs:
-
Single nucleotide polymorphisms
- USPSTF:
-
United States Preventive Services Task Force
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Acknowledgements
We are grateful to Charles E. McCulloch, PhD for his input on statistical methods. The collection of cancer data was supported in part by the California Cancer Registry. For a full description, please see: http://breastscreening.cancer.gov/work/acknowledgement.html. We thank the participating women, mammography facilities, and radiologists for the data they have provided for this study.
Funding
This work was supported by the NCI-funded Breast Cancer Surveillance Consortium grant P01 CA154292. E. Ziv also received support from the National Cancer Institute under grant K24 CA169004. S.R. Cummings also received support for the collection of blood specimens from the DaCosta Fund for the Prevention of Breast Cancer, the Clinical Research in Clinical Care (CRCLE) funds provided by the California Pacific Medical Center, and by a grant from the Eli Lilly Foundation. Y. Shieh was supported by a National Research Service Award through the National Institutes of Health T32 HP19025. Data collection for this work was supported by the National Cancer Institute-funded Breast Cancer Surveillance Consortium (HHSN261201100031C). The content is solely the responsibility of the authors and does not necessarily represent the official views of the National Cancer Institute or the National Institutes of Health.
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All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. Specifically, each registry in the Breast Cancer Surveillance Consortium and the Statistical Coordinating Center (SCC) have received institutional review board approval for either active or passive consenting processes or a waiver of consent to enroll participants, link data, and perform analytic studies. All procedures are Health Insurance Portability and Accountability Act (HIPAA) compliant and all registries and the SCC have received a Federal Certificate of Confidentiality and other protection for the identities of women, physicians, and facilities who are subjects of this research.
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Shieh, Y., Hu, D., Ma, L. et al. Joint relative risks for estrogen receptor-positive breast cancer from a clinical model, polygenic risk score, and sex hormones. Breast Cancer Res Treat 166, 603–612 (2017). https://doi.org/10.1007/s10549-017-4430-2
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DOI: https://doi.org/10.1007/s10549-017-4430-2