Abstract B75: Pregnancy hormones and maternal risk of hormone receptor-defined breast cancer

Introduction: Hormonal exposure during pregnancy is believed to be associated with subsequent maternal risk of breast cancer, but so far limited epidemiological data are available. Study design: A case-control study (223 cases and 417 controls) was nested within the Northern Sweden Maternity Cohort to explore the associations between pregnancy concentrations of sex steroid hormones and insulin-like growth factor I (IGF-I) with maternal risk of breast cancer by hormone receptor (HR) expression of the tumors. The study included women who had donated a blood sample during the first trimester of their first full-term pregnancy. Most cases had HR-positive disease: 171 (77%) estrogen receptor-positive (ER+), 157 (70%) progesterone receptor-positive (PR+) and 152 (68%) ER+/PR+ tumors. Estradiol, estrone, progesterone and testosterone were measured by high-performance liquid chromatography tandem mass spectrometry. Sex hormone-binding globulin (SHBG) and insulin-like growth factor I (IGF-I) were measured by immunoassays. For each hormone, the difference (residual) between the actual assay value for each subject and the estimated mean determined for the day of gestation when the sample was drawn was computed by local linear regression. Conditional logistic regression was used to calculate odds ratios (OR) and 95% confidence intervals (CI). Results: For HR-positive tumors, a significant direct association was observed with circulating concentrations of testosterone (e.g. OR for ER+ in the top versus bottom tertile of 1.8 (1.1-3.0), p<0.02) and IGF-I (e.g. OR for ER+ in the top versus bottom tertile of 2.0 (1.2-3.3), p<0.01). For HR-negative disease, risk estimates for a doubling of estrogens, progesterone and SHBG concentrations were above unity, but did not reach statistical significance with the exception of progesterone for PR-negative tumors (OR 2.0 (1.0-3.9), p<0.04). In analyses limited to ER-negative tumors diagnosed up to age 50 (n=38), these associations were stronger, but only of borderline significance. For PR-negative tumors diagnosed up to age 50 (n=49), the associations were significant for estradiol (OR 1.8 (1.0-3.1), p<0.04), progesterone (OR 2.6 (1.1-6.1), p<0.03) and SHBG (OR 1.8 (1.0-3.0), p<0.04). Adjustments for maternal height, weight, smoking, hypertension during pregnancy, child's sex, weight and length had negligible effect on risk estimates. Associations were similar by combined ER/PR tumor status or when limited to cases diagnosed ≥10 years after blood donation. Conclusions: In this nested case-control study hormone concentrations during early pregnancy were associated with risk of maternal breast cancer but the associations differed by hormone receptor expression of the tumors. For hormones with placental contribution to circulating concentrations (estrogens and progesterone), there were indications for positive associations with risk of maternal HR-negative breast cancer. For hormones, with similar concentrations during early pregnancy and in the non-pregnant state (testosterone and IGF-I), direct associations with HR-positive breast cancer were observed, in line with most available epidemiological data in non-pregnant women. Larger studies are necessary to characterize the association of pregnancy hormones with risk of hormone-defined maternal breast cancer. Citation Format: Annekatrin Lukanova, Egle Tolockiene, Helena Schock, Kjell Grankvist, Hans Ake Lakso, Helja Marja Surcel, Goran Wadell, Anne Zelenuich-Jacquotte, Paolo Toniolo, Eva Lundin. Pregnancy hormones and maternal risk of hormone receptor-defined breast cancer. [abstract]. In: Proceedings of the Eleventh Annual AACR International Conference on Frontiers in Cancer Prevention Research; 2012 Oct 16-19; Anaheim, CA. Philadelphia (PA): AACR; Cancer Prev Res 2012;5(11 Suppl):Abstract nr B75.