Dataset Information

Overall and central adiposity and breast cancer risk in the Sister Study.

ABSTRACT: BACKGROUND:Greater body mass index (BMI), a measure of overall adiposity, is associated with a higher risk of postmenopausal breast cancer. The role of central adiposity, often measured by waist circumference, is less well understood, especially among premenopausal women. The objective of the current study was to examine multiple measures of adiposity in relation to breast cancer in a prospective cohort study. METHODS:A total of 50,884 Sister Study cohort participants aged 35 to 74 years were enrolled from 2003 through 2009. Inclusion criteria for the cohort included having a sister previously diagnosed with breast cancer. Trained study personnel measured height, weight, and waist and hip circumference during a home visit and study participants completed a detailed questionnaire. Using Cox regression analysis, we estimated multivariable hazard ratios (HRs) and 95% confidence intervals (95% CIs) for breast cancer risk associated with adiposity measurements, considering tumor subtype and menopausal status. RESULTS:In total, 2009 breast cancers were diagnosed during follow-up (mean?=?5.4 years). Weight, BMI, waist circumference, and waist-to-hip ratio were found to be positively associated with overall breast cancer risk and HRs were greater among postmenopausal women, those with hormonally responsive tumors, and women who were not currently using postmenopausal hormones. In models that adjusted for BMI, waist circumference associations persisted among both postmenopausal women (81-88 cm vs ?80 cm: HR?=?1.16 [95% CI 1.01-1.35] and >88 cm vs ?80 cm: HR?=?1.30 [95% CI 1.10-1.54]) and premenopausal women (81-88 cm vs ?80 cm: HR?=?1.56 [95% CI 1.19-2.04] and >88 cm vs ?80 cm: HR?=?1.30 [95% CI 0.91-1.87]). CONCLUSIONS:Findings from this large, prospective study with examiner-measured body size indicate that waist circumference is independently and positively associated with both premenopausal and postmenopausal breast cancer risk.

SUBMITTER: White AJ

PROVIDER: S-EPMC4592412 | biostudies-literature | 2015 Oct

REPOSITORIES: biostudies-literature

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Overall and central adiposity and breast cancer risk in the Sister Study.

White Alexandra J AJ Nichols Hazel B HB Bradshaw Patrick T PT Sandler Dale P DP

Cancer 20150720 20

<h4>Background</h4>Greater body mass index (BMI), a measure of overall adiposity, is associated with a higher risk of postmenopausal breast cancer. The role of central adiposity, often measured by waist circumference, is less well understood, especially among premenopausal women. The objective of the current study was to examine multiple measures of adiposity in relation to breast cancer in a prospective cohort study.<h4>Methods</h4>A total of 50,884 Sister Study cohort participants aged 35 to 7 ...[more]

PMID: 26193782

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Project description:BackgroundEarlier age at menarche is an established risk factor for breast cancer. While age at menarche has been fairly stable over the past half-century, age at breast development (thelarche) has continued to decrease. Recently, earlier age at thelarche and a longer time between thelarche and menarche (pubertal tempo) were shown to be associated with increased breast cancer risk. Our objective was to examine how breast cancer risk was associated with pubertal timing and tempo in a prospective US cohort.MethodsWomen ages 35-74 years without a history of breast cancer, but who had a sister previously diagnosed with breast cancer, were enrolled in the Sister Study from 2003 to 2009 (N = 50,884). At enrollment, participants reported their ages at thelarche and menarche. Pubertal tempo was age at menarche minus age at thelarche. We estimated adjusted hazard ratios (HRs) and 95% confidence intervals (CIs) for each pubertal milestone and risk of breast cancer (invasive or ductal carcinoma in situ) using Cox proportional hazards regression. We examined whether associations between age at thelarche and breast cancer risk were modified by birth cohort, race/ethnicity, weight at age 10, and extent of breast cancer family history, as characterized by a Bayesian score based on first-degree family structure.ResultsDuring follow-up (mean = 9.3 years), 3295 eligible women were diagnosed with breast cancer. Early ages at thelarche (HR = 1.23, 95% CI 1.03-1.46 for < 10 vs. 12-13 years) and menarche (HR = 1.10, 95% CI 1.01-1.20 for < 12 vs. 12-13 years) were positively associated with breast cancer risk. Pubertal tempo was not associated with breast cancer risk (HR = 0.99, 95% CI 0.97-1.02 per 1-year longer tempo). When considering early thelarche (< 10 years) and early menarche (< 12 years) jointly, women with both had a 30% greater risk of breast cancer compared with women with neither risk factor (95% CI 1.07-1.57). The association between age at thelarche and breast cancer risk did not significantly vary by birth cohort, race/ethnicity, childhood weight, or Bayesian family history score.ConclusionsEarlier ages at thelarche and menarche may enhance susceptibility to breast carcinogenesis. Age at thelarche is an important risk factor to consider given secular trends towards earlier development.

Project description:BackgroundLight at night (LAN) may alter estrogen regulation through circadian disruption. High levels of outdoor LAN may increase breast cancer risk, but studies have largely not considered possible residual confounding from correlated environmental exposures. We evaluated the association between indoor and outdoor LAN and incident breast cancer.MethodsIn 47,145 participants in the prospective Sister Study cohort living in the contiguous U.S., exposure to outdoor LAN was determined using satellite-measured residential data and indoor LAN was self-reported (light/TV on, light from outside the room, nightlight, no light). We used Cox proportional hazards models to calculate hazard ratios (HRs) and 95% confidence intervals (CIs) for the associations between outdoor and indoor LAN and breast cancer risk. Models were adjusted for age, race/ethnicity, educational attainment, annual household income, neighborhood disadvantage, latitude, and population density as a proxy for urbanicity. To evaluate the potential for residual confounding of the outdoor LAN and breast cancer relationship by factors associated with urbanicity, we considered further adjustment for exposures correlated with outdoor LAN including NO2 [Spearman correlation coefficient, rho (ρ) = 0.78], PM2.5 (ρ = 0.36), green space (ρ = - 0.41), and noise (ρ = 0.81).ResultsDuring 11 years of follow-up, 3,734 breast cancer cases were identified. Outdoor LAN was modestly, but non-monotonically, associated with a higher risk of breast cancer (Quintile 4 vs 1: HR = 1.10, 95% CI: 0.99-1.22; Quintile 5 vs 1: HR = 1.04, 95% CI: 0.93-1.16); however, no association was evident after adjustment for correlated ambient exposures (Quintile 4 vs 1: HR = 0.99, 95% CI: 0.86-1.14; Quintile 5 vs 1: HR = 0.89, 95% CI: 0.74-1.06). Compared to those with no indoor LAN exposure, sleeping with a light or TV on was associated with a HR = 1.09 (95% CI: 0.97-1.23) in the adjusted model.ConclusionsOutdoor LAN does not appear to increase the risk of breast cancer after adjustment for correlated environmental exposures.

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Dataset Information

Overall and central adiposity and breast cancer risk in the Sister Study.

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Overall and central adiposity and breast cancer risk in the Sister Study.

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