Dataset Information

Reproductive factors and incidence of endometrial cancer in U.S. black women.

ABSTRACT: Previous studies have shown that reproductive history is a strong determinant of endometrial cancer risk among white women. Less is known about how reproductive history affects endometrial cancer risk among black women, whose incidence and mortality differ from white women. We investigated the associations of age at menarche, parity, timing of births, and menopausal age with endometrial cancer in the Black Women's Health Study, a prospective cohort study.Every 2 years from 1995 to 2013, 47,555 participants with intact uteri at baseline in 1995 completed questionnaires on reproductive and medical history, and lifestyle factors. Self-reported cases of endometrial cancer were confirmed by medical record, cancer registry, or death certificate when available. Cox proportional hazards regression was used to estimate multivariable incidence rate ratios (IRR) and 95% confidence intervals (CI).During 689,501 person-years of follow-up, we identified 300 incident cases of endometrial cancer. The strongest associations with endometrial cancer were found for early age at menarche (<11 vs. 12-13 years: IRR 1.82, 95% CI 1.31, 2.52), and later age at first birth (?30 vs. <20 years: IRR 0.26, 95% CI 0.13, 0.50). Parous women were less likely than nulliparous women to develop endometrial cancer (IRR 0.77, 95% CI 0.57, 1.05), but there was little evidence of a dose-response relationship for number of births.Associations between reproductive factors and endometrial cancer among black women were generally consistent with those in studies of white women.

SUBMITTER: Sponholtz TR

PROVIDER: S-EPMC5634741 | biostudies-literature | 2017 Jun

REPOSITORIES: biostudies-literature

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Reproductive factors and incidence of endometrial cancer in U.S. black women.

Sponholtz Todd R TR Palmer Julie R JR Rosenberg Lynn L Hatch Elizabeth E EE Adams-Campbell Lucile L LL Wise Lauren A LA

Cancer causes & control : CCC 20170330 6

<h4>Purpose</h4>Previous studies have shown that reproductive history is a strong determinant of endometrial cancer risk among white women. Less is known about how reproductive history affects endometrial cancer risk among black women, whose incidence and mortality differ from white women. We investigated the associations of age at menarche, parity, timing of births, and menopausal age with endometrial cancer in the Black Women's Health Study, a prospective cohort study.<h4>Methods</h4>Every 2 y ...[more]

PMID: 28361447

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Project description:ImportanceAlthough estrogen level is positively associated with bone mineral density, there are limited data on the risk of fractures after menopause.ObjectiveTo investigate whether female reproductive factors are associated with fractures among postmenopausal women.Design, setting, and participantsThis population-based retrospective cohort study used data from the Korean National Health Insurance Service database on 1 272 115 postmenopausal women without previous fracture who underwent both cardiovascular and breast and/or cervical cancer screening from January 1 to December 31, 2009. Outcome data were obtained through December 31, 2018.ExposuresInformation was obtained about reproductive factors (age at menarche, age at menopause, parity, breastfeeding, and exogenous hormone use) by self-administered questionnaire.Main outcomes and measuresIncidence of any fractures and site-specific fractures (vertebral, hip, and others).ResultsAmong the 1 272 115 participants, mean (SD) age was 61.0 (8.1) years. Compared with earlier age at menarche (≤12 years), later age at menarche (≥17 years) was associated with a higher risk of any fracture (adjusted hazard ratio [aHR], 1.24; 95% CI, 1.17-1.31) and vertebral fracture (aHR, 1.42; 95% CI, 1.28-1.58). Compared with earlier age at menopause (<40 years), later age at menopause (≥55 years) was associated with a lower risk of any fracture (aHR, 0.89; 95% CI, 0.86-0.93), vertebral fracture (aHR, 0.77; 95% CI, 0.73-0.81), and hip fracture (aHR, 0.88; 95% CI, 0.78-1.00). Longer reproductive span (≥40 years) was associated with lower risk of fractures compared with shorter reproductive span (<30 years) (any fracture: aHR, 0.86; 95% CI, 0.84-0.88; vertebral fracture: aHR, 0.73; 95% CI, 0.71-0.76; and hip fracture: aHR, 0.87; 95% CI, 0.80-0.95). Parous women had a lower risk of any fracture than nulliparous women (aHR, 0.96; 95% CI, 0.92-0.99). Although breastfeeding for 12 months or longer was associated with a higher risk of any fractures (aHR, 1.05; 95% CI, 1.03-1.08) and vertebral fractures (aHR, 1.22; 95% CI, 1.17-1.27), it was associated with a lower risk of hip fracture (aHR, 0.84; 95% CI, 0.76-0.93). Hormone therapy for 5 years or longer was associated with lower risk of any factures (aHR, 0.85; 95% CI, 0.83-0.88), while use of oral contraceptives for 1 year or longer was associated with a higher risk of any fractures (aHR, 1.03; 95% CI, 1.01-1.05).Conclusions and relevanceThe findings of this cohort study suggest that female reproductive factors are independent risk factors for fracture, with a higher risk associated with shorter lifetime endogenous estrogen exposure. Interventions to reduce fracture risk may be needed for women at high risk, including those without osteoporosis.

Project description:BackgroundDifferences in receipt of guideline-concordant treatment might underlie well-established racial disparities in endometrial cancer mortality.ObjectiveUsing the National Cancer Database, we assessed the hypothesis that among women with endometrioid endometrial cancer, racial/ethnic minority women would have lower odds of receiving guideline-concordant treatment than white women. In addition, we hypothesized that lack of guideline-concordant treatment was linked with worse survival.Study designWe defined receipt of guideline-concordant treatment using the National Comprehensive Cancer Network guidelines. Multivariable logistic regression models were used to compute odds ratios and 95% confidence intervals for associations between race and guideline-concordant treatment. We used multivariable Cox proportional hazards regression models to estimate hazards ratios and 95% confidence intervals for relationships between guideline-concordant treatment and overall survival in the overall study population and stratified by race/ethnicity.ResultsThis analysis was restricted to the 89,319 women diagnosed with an invasive, endometrioid endometrial cancer between 2004 and 2014. Overall, 74.7% of the cohort received guideline-concordant treatment (n = 66,699). Analyses stratified by race showed that 75.3% of non-Hispanic white (n = 57,442), 70.1% of non-Hispanic black (n = 4334), 71.0% of Hispanic (n = 3263), and 72.5% of Asian/Pacific Islander patients (n = 1660) received treatment in concordance with guidelines. In multivariable-adjusted models, non-Hispanic black (odds ratio, 0.92, 95% confidence interval, 0.86-0.98) and Hispanic women (odds ratio, 0.90, 95% confidence internal, 0.83-0.97) had lower odds of receiving guideline-concordant treatment compared with non-Hispanic white women, while Asian/Pacific Islander women had a higher odds of receiving guideline-concordant treatment (odds ratio, 1.11, 95% confidence interval, 1.00-1.23). Lack of guideline-concordant treatment was associated with lower overall survival in the overall study population (hazard ratio, 1.12, 95% confidence interval, 1.08-1.15) but was not significantly associated with overall survival among non-Hispanic black (hazard ratio, 1.09, 95% confidence interval, 0.98-1.21), Hispanic (hazard ratio, 0.92, 95% confidence interval=0.78-1.09), or Asian/Pacific Islander (hazard ratio, 0.90, 95% confidence interval, 0.70-1.16) women.ConclusionNon-Hispanic black and Hispanic women were less likely than non-Hispanic white women to receive guideline-concordant treatment, while Asian/Pacific Islander women more commonly received treatment in line with guidelines. Furthermore, in the overall study population, overall survival was worse among those not receiving guideline-concordant treatment, although low power may have had an impact on the race-stratified models. Future studies should evaluate reasons underlying disparate endometrial cancer treatment.

Project description:Importance:Black women with endometrial cancer have a 90% higher mortality rate than white women with endometrial cancer. The advanced disease stage at which black women receive a diagnosis of endometrial cancer is a major factor in this disparity and is not explained by differences in health care access. Objective:To describe the prediagnostic experiences of symptoms and symptom disclosure among black women with endometrial cancer. Design, Setting, and Participants:This community-engaged qualitative study developed an interview guide to collect data during semistructured interviews among a sample of 15 black women with endometrial cancer in the United States. Interviews were conducted in person or via a secure conferencing platform. An exploratory and descriptive content analysis was performed using iterative rounds of inductive coding, case summaries, and coanalysis with community input to identify emergent themes. Data were collected from October 3, 2017, to April 15, 2019, and the descriptive content analysis was performed from October 11, 2017, to May 6, 2019. Main Outcomes and Measures:Beliefs, interpretations, and experiences of black women with endometrial cancer from symptom onset to diagnostic confirmation of cancer. Results:Participants included 15 women who self-identified as black or African American and ranged in age from 31 to 72 years. Eight participants lived in the Puget Sound region of Washington, 2 participants lived in California, and 1 participant each lived in Alabama, Michigan, Louisiana, Georgia, and New York. Twelve participants were receiving adjuvant therapy during the study, which indicated that they were either in a high-risk group and/or had advanced-stage disease. Thirteen participants had health insurance at the time of symptom onset, and all participants had elected to receive cancer treatment. Participants described knowledge gaps and silence about menopause, misinterpretation of vaginal bleeding, and responses by first-line health care practitioners that were not aligned with the risk of endometrial cancer among black women in the United States. Conclusions and Relevance:The responses of interviewed black women with endometrial cancer suggest that several mechanisms may be associated with a delay in care before diagnosis among this high-risk population and represent modifiable factors that may be useful in the development of targeted interventions to improve the rates of early diagnosis among black women with endometrial cancer.

Dataset Information

Reproductive factors and incidence of endometrial cancer in U.S. black women.

Publications

Reproductive factors and incidence of endometrial cancer in U.S. black women.

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