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Pre-diagnosis alcohol consumption and mortality risk among black women and white women with invasive breast cancer
BMC Cancer volume 19, Article number: 800 (2019)
Alcohol consumption is associated with increased risk of breast cancer; however, its association with subsequent risk of breast cancer death is unclear.
We followed 4523 women with complete information on relevant risk factors for mortality; these women were 35 to 64 years of age when diagnosed with incident invasive breast cancer between 1994 and 1998. During follow up (median, 8.6 years), 1055 women died; 824 died from breast cancer. The information on alcohol consumption before diagnosis was collected shortly after breast cancer diagnosis (average: 5.1 months) during an in-person interview which used a structured questionnaire. Multivariable Cox proportional hazards regression models provided hazard ratios (HRs) and 95% confidence intervals (CIs) for breast cancer-specific mortality, mortality due to causes other than breast cancer, and all-cause mortality associated with alcohol consumption from age 15 years until breast cancer diagnosis and during recent periods of time prior to breast cancer diagnosis.
Average weekly alcohol consumption from age 15 years until breast cancer diagnosis was inversely associated with breast cancer-specific mortality (Ptrend = 0.01). Compared to non-drinkers, women in the highest average weekly alcohol consumption category (≥7 drinks/week) had 25% lower risk of breast cancer-specific mortality (HR = 0.75, 95% CI = 0.56–1.00). Breast cancer mortality risk was also reduced among women in the highest average weekly alcohol consumption category in two recent time periods (5-year period ending 2-years prior to breast cancer diagnosis, HR = 0.74, 95% CI = 0.57–0.95; 2-year period immediately prior to breast cancer diagnosis: HR = 0.73, 95% CI = 0.56–0.95). Furthermore, analyses of average weekly alcohol consumption by beverage type from age 15 years until breast cancer diagnosis suggested that wine consumption was inversely associated with breast cancer-specific mortality risk (wine Ptrend = 0.06, beer Ptrend = 0.24, liquor Ptrend = 0.74). No association with any of these alcohol consumption variables was observed for mortality risk due to causes other than breast cancer.
Overall, we found no evidence that alcohol consumption before breast cancer diagnosis increases subsequent risk of death from breast cancer.
Alcohol consumption is associated with increased risk of breast cancer [1,2,3,4,5]. It may also influence tumor progression and breast cancer recurrence, thus affecting risk of breast cancer-specific mortality. Previous findings regarding the association of pre-diagnosis alcohol consumption with risk of breast cancer-specific mortality are mixed, showing decreased risk [6,7,8], increased risk [9,10,11], and no association [12,13,14,15,16,17,18,19,20]. A meta-analysis of 11 published studies demonstrated that moderate pre-diagnosis alcohol consumption was associated with reduced risk of all-cause mortality, but did not provide summary data for breast cancer-specific mortality risk . Moreover, it remains unknown whether type of alcoholic beverages consumed plays a role [6, 7, 9, 19].
Here we report results from a mortality analysis for a cohort of women with invasive breast cancer, who participated in the Women’s Contraceptive and Reproductive Experiences (CARE) Study. The objective of this analysis was to investigate whether risk of dying from breast cancer is associated with pre-diagnosis alcohol consumption overall or with specific type of alcohol beverages consumed (wine, beer, and liquor).
Study population and data collection
The study population comprised breast cancer patients who participated in the Women’s CARE Study, a population-based multi-center breast cancer case-control study. Methods used in conducting the study were reported previously . In brief, 4575 (1622 black and 2953 white) women aged 35 to 64 years when diagnosed with histologically confirmed first primary invasive breast cancer (International Classification of Diseases for Oncology (ICD-O) codes C50.0-C50.9) were recruited at five field sites (Atlanta, Detroit, Los Angeles, Philadelphia, and Seattle) between July 1994 and April 1998. The Women’s CARE Study protocol was approved by the institutional review boards at all participating institutions.
Information on exposures occurring before breast cancer diagnosis was collected shortly after case patients’ breast cancer diagnoses (average: 5.1 months) by trained staff who administered standardized in-person interviews using a structured questionnaire. The questionnaire covered demographic characteristics, alcohol consumption, medical and reproductive history, oral contraceptive use, menopausal hormonal therapy use, mammographic screening patterns, lifetime exercise participation, and smoking history. Tumor characteristics, including tumor stage at diagnosis and estrogen receptor (ER) status, were abstracted from medical records in Philadelphia and from Surveillance, Epidemiology and End Results (SEER) registry records at the other study sites.
Assessment of alcohol consumption
A positive history of alcohol consumption prior to breast cancer diagnosis was defined as having consumed at least 12 alcoholic drinks overall and at least one drink a month for 6 or more months. One drink was equivalent to 12 oz. of beer, 4 oz. of wine, or 1.5 oz. of liquor. Women were asked the age at which they first consumed alcohol, the types of alcoholic beverage, the number of drinks for each type of alcohol they consumed per week or per month at that age, and the age at which the reported alcohol consumption pattern changed. Age at which drinking pattern changed marked the end of the first drinking interval and the start of the second. Additional intervals were recorded for each change reported. Consumption was recorded up to the patient’s date of diagnosis. We calculated the number of drinks consumed per week for each year of age, for each beverage (wine, beer, or liquor), and for all beverages combined.
The alcohol consumption variables defined for this analysis included: drinking status (non-drinkers, drinkers) and average weekly alcohol consumption from age 15 years until breast cancer diagnosis (non-drinkers, < 1, 1–< 3, 3–< 7, and ≥ 7 drinks per week), and two time periods of recent consumption before breast cancer diagnosis (non-drinkers, < 1, 1–< 3, 3–< 7, ≥7 drinks per week, and “drinkers who did not drink in this time period”). Recent consumption analyses assessed average alcohol intake in two mutually exclusive time periods: 1) the 5-year period beginning 7 years before breast cancer diagnosis and ending 2 years before diagnosis (i.e., excluding the two years before breast cancer diagnosis to avoid any disease-related changes in alcohol consumption that might have occurred, herein referred to as “recent 5-year period”), and 2) the 2-year period beginning 2 years prior to diagnosis and ending when breast cancer was diagnosed (herein referred to as “recent 2-year period”). In our analyses by beverage type, consumption categories were: non-drinkers, < 1, 1–< 3, and ≥ 3 drinks per week from age 15 years until breast cancer diagnosis.
Vital status follow-up
As described previously , women were followed annually (through December 2004 in Atlanta, Detroit and Seattle, through December 2005 in Philadelphia, and through December 2007 in Los Angeles) to determine vital status, and if death occurred, date of death and cause of death were recorded. The Philadelphia field site used state death records to track vital status. The other study sites used standard SEER follow-up procedures. During follow up, 1068 (528 black, 540 white) women died of all causes and 832 (414 blacks, 418 whites) died from breast cancer.
Multivariable Cox proportional hazards regression models were fit to data and provided adjusted hazard ratios (HRs) and 95% confidence intervals (CIs) for the associations of pre-diagnosis alcohol consumption variables with breast cancer-specific mortality (ICD codes ICD9–174, ICD10-C50) , with mortality due to causes other than breast cancer, and with all-cause mortality. The time scale for analysis beginning at breast cancer diagnosis was age in days extending to death or to end of follow-up. When the outcome of interest was breast cancer-specific mortality, women who died from other causes were censored on their dates of death. When the outcome of interest was mortality due to causes other than breast cancer, women who died from breast cancer were censored on their dates of death.
Our statistical models were stratified by age in years at diagnosis, and adjusted for study site (Atlanta, Detroit, Los Angeles, Philadelphia, or Seattle), race (black, white), education (less than high school, high school, technical school or some college, college graduate), household income (0–< 2, 2–< 3, 3–< 5, 5–< 7, ≥7 times the federal poverty guideline for 1996 , where “1996” is the approximate midpoint of the diagnosis years for case-patient participants in the Women’s CARE Study), number of mammogram visits during the 5 years before breast cancer diagnosis (0, 1, 2–3, ≥4), body mass index (BMI) 5-years before diagnosis (< 20, 20–24.9, 25–29.9, ≥30 kg/m2), number of comorbidities diagnosed before breast cancer diagnosis (0, 1, ≥2 based on diagnoses of hypertension, myocardial infarction, stroke, diabetes, and cancers other than non-melanoma skin cancers), smoking status (never, former, current smoker), tumor stage (localized, non-localized), estrogen receptor (ER) status (ER positive, ER+; ER negative, ER–; unknown), and histologic type of breast cancer (ductal, lobular, other). In analyses for a specific type of alcohol, our models additionally adjusted for other types of alcohol (wine adjusted for beer and liquor, beer adjusted for wine and liquor, liquor adjusted for beer and wine).
Other potential confounders, including first-degree family history of breast cancer, age at menarche, number of full-term pregnancies, menopausal status, menopausal hormone therapy use, average MET-hours per week of physical activity, tumor size, and tumor grade, had minimal influence on estimated hazard ratios and hence were not included in the final statistical models.
Tests for trend were conducted by fitting the median value in each exposure category and testing whether the slope coefficient differed from zero. Likelihood ratio tests were conducted to explore effect modifiers. The potential effect modifiers of interest were: household income (< 3 times vs. ≥3 times the federal poverty guideline), race (black women vs. white women), education (≤ high school vs. >high school), menopausal status at diagnosis (premenopausal vs. postmenopausal), BMI 5-years before diagnosis (< 25 vs. ≥25 kg/m2), comorbid conditions (no vs. yes), cigarette smoking status (never vs. ever), stage of breast cancer at diagnosis (localized vs. non-localized), ER status of the tumor (positive vs. negative), and histologic type (ductal vs. lobular).
We excluded women from the analytic cohort who had unknown values for a variable when the unknown category comprised fewer than 0.5% of the participants: 22 women with incomplete information on alcohol consumption, 22 women missing information on BMI 5-years before diagnosis, 7 women with unknown number of mammograms within the 5 years before breast cancer diagnosis, and 1 woman missing information on education. Thus, 4523 case-patients (1598 blacks and 2925 whites) comprised the analytic cohort. Among these women, 1055 (519 blacks, 536 whites) died during follow up (median, 8.6 years), including 824 (409 blacks, 415 whites) who died from breast cancer.
The mean age at breast cancer diagnosis was 49.7 years among these women who were, by design, only eligible for the Women’s CARE Study if they had been diagnosed at ages 35 to 64 years. Compared to non-drinkers, drinkers, who had ever drunk alcohol from age 15 years until breast cancer diagnosis, were more likely to be younger, premenopausal, living in Seattle, white, more educated, former or current smokers, and comorbidity-free, and to have lower BMI and higher household income levels (All P ≤ 0.008, Table 1). They were also more likely to have been diagnosed with a localized, ER+ tumor (Both P ≤ 0 .001). Drinkers did not differ from non-drinkers on number of mammograms in the 5 years before diagnosis (P = 0.83) or histologic type of breast cancer (P = 0.24).
Alcohol consumption and mortality risk
Ever drinking alcohol from age 15 years until breast cancer diagnosis was associated with a modest decrease in risk of breast cancer-specific mortality (HR = 0.87, 95% CI = 0.75–1.01), although the 95% CI included 1.0 (Table 2). Average weekly alcohol consumption from age 15 years until breast cancer diagnosis was inversely associated with breast cancer-specific mortality risk (Ptrend = 0.01). Compared to non-drinkers, women who averaged at least 7 drinks of alcohol per week from age 15 years until breast cancer diagnosis had a modest reduction in risk of breast cancer-specific mortality (HR = 0.75, 95% CI = 0.56–1.00). Similar risk patterns for breast cancer-specific mortality were observed for alcohol consumption in the recent 5-year period ending 2 years prior to diagnosis and in the most recent 2-year period prior to breast cancer diagnosis; however, the corresponding 95% CIs of HRs associated with the highest category of average weekly alcohol consumption during these two mutually exclusive recent time periods excluded 1.0 (recent 5-year period ending 2 years before diagnosis: HR = 0.74, 95% CI = 0.57–0.95; recent 2-year period before diagnosis: HR = 0.73, 95% CI = 0.56–0.95). No association with ever drinking alcohol or with average weekly alcohol consumption drinking during different time periods was observed for risk of mortality due to causes other than breast cancer. The inverse associations of these alcohol consumption variables with risk of all-cause mortality were similar to those with risk of breast cancer-specific mortality.
Wine, beer, or liquor consumption and mortality risk
Analyses by beverage type showed that wine consumption was inversely associated with breast cancer-specific mortality risk (wine Ptrend = 0.06, beer Ptrend = 0.24, liquor Ptrend = 0.74; Table 3). Compared to non-drinking women, those who consumed, on average, at least 3 drinks of wine per week from age 15 years until breast cancer diagnosis had a modest reduction in breast cancer-specific mortality risk (HR = 0.76, 95% CI = 0.53–1.11). Similar risk reduction associated with the highest level of wine consumption was observed for all-cause mortality (HR = 0.73, 95% CI = 0.53–1.01). Although we did not observe statistically significant trends in risk overall for either beer or liquor consumption, the highest level of beer consumption (≥ 3 drinks/week) was modestly associated with breast cancer-specific and all-cause mortality, which was similar to the findings for wine (breast cancer-specific: HR = 0.79, 95% CI = 0.59–1.07; all-cause: HR = 0.77, 95% CI = 0.59–1.00). No association with any specific type of alcohol consumption was observed for risk of mortality due to causes other than breast cancer.
Exploratory analyses for potential effect modifiers of the association between specific type of alcohol consumed and breast cancer-specific mortality risk
We conducted exploratory effect modification analyses to determine whether the mortality association with wine, beer, or liquor consumption differed among subgroups of potential effect modifiers of interest; we found that the observed inverse association between average weekly wine consumption from age 15 years until breast cancer diagnosis and risk of breast cancer-specific mortality was modified by household income level (Table 4). Among women with a lower household income (< 3 times the federal poverty guideline), women in the highest category of average weekly wine consumption (≥3 drinks/week) from age 15 years until breast cancer diagnosis had 68% lower risk of breast cancer-specific mortality than non-drinkers (HR = 0.32, 95% CI = 0.14–0.74, Ptrend = 0.003); no reduction in risk was observed among those with a higher household income (≥3 times the federal poverty guideline, HR = 1.09, 95% CI = 0.72–1.63, Ptrend = 0.98, likelihood ratio test for heterogeneity of trends for a lower vs. higher household income: Pheterogeneity = 0.005). No effect modification was observed for beer or liquor (results not shown).
In this large cohort of women diagnosed with invasive breast cancer between the ages of 35 and 64 years, those who drank, on average, at least seven alcoholic beverages per week from age 15 years until breast cancer diagnosis had a 25% non-statistically significant lower risk of breast cancer-specific mortality than non-drinkers of alcohol. Similar magnitudes of risk reduction were observed for alcohol consumption in the recent 5-year period ending 2 years before diagnosis and in the most recent 2-year period before breast cancer diagnosis. Analyses by beverage type suggested that wine consumption was inversely associated with risk of breast cancer-specific mortality.
Previous findings for the association between pre-diagnosis alcohol consumption and risk of breast cancer-specific mortality are inconsistent [6,7,8,9,10,11,12,13,14,15,16,17,18,19,20], which could be due, at least partly, to variations in statistical power, time periods of alcohol consumption, or levels of alcohol consumption in these studies. Reding et al.  report that in 1286 women diagnosed with invasive breast cancer at age 45 years or younger (364 deaths, 335 from breast cancer), long-term alcohol consumption (from age 15 years until breast cancer diagnosis) and alcohol consumption in a recent 5-year time period were associated with a decreased risk of death from breast cancer. We used the same definitions for long-term alcohol consumption and recent consumption as were used by Reding et al. and replicated their findings. Lowry et al.  present findings from the Women’s Health Initiative (WHI) observational study which are consistent with our finding that pre-diagnosis alcohol consumption is inversely associated with breast cancer-specific mortality risk. Newcomb et al.  found an inverse association of breast cancer-specific mortality that was limited to women in the moderate category of alcohol consumption (3–6 drinks/week) relative to non-drinkers in the Collaborative Breast Cancer Study (CBCS) and observed no association in heavier drinkers (≥10 drinks/week). This suggests a U-shaped relationship between lifetime alcohol consumption and breast cancer specific mortality. Three studies report an increased risk of breast cancer-specific mortality, associated with higher daily alcohol consumption (e.g., a 6% increase in risk, 95% CI = 3–10% with > 20 g/day of alcohol consumed) [9,10,11]. Our data provide no evidence that alcohol consumption before breast cancer diagnosis increases subsequent risk of death from breast cancer. It is possible that the relatively low levels of alcohol consumed in our study participants (95th percentile among drinkers was 12.9 drinks per week) may have limited our ability to detect this association.
Only four published epidemiologic studies provide data regarding whether the impact of alcohol consumption on breast cancer death varies by type of alcohol [6, 7, 9, 19]. Reding et al.  report that wine consumed in the five years before diagnosis was associated with a decreased risk of breast cancer-specific mortality, but neither beer nor liquor consumed in that period was associated with breast cancer-specific mortality risk. Newcomb et al.  report that the association between moderate lifetime pre-diagnosis alcohol consumption (3–6 drinks/week) and decreased risk of breast cancer-specific mortality in the CBCS did not vary by type of alcoholic beverage. Jain et al.  observed a 15% increase in breast cancer-specific mortality risk associated with daily consumption of more than 10 g of wine (HR = 1.146, 95% CI = 1.111–1.182) and a 5% decrease in risk associated with daily consumption of more than 10 g of spirits (HR = 0.945, 95% CI = 0.915–0.976). Consumption of more than 10 g/day of beer was not associated with breast cancer-specific mortality (HR = 1.025, 95% CI = 0.969–1.085). Din et al.  report that overall, breast cancer-specific mortality risk was not associated with the type of alcohol consumed before diagnosis, whereas they observed statistically significant associations in analyses stratified by stage of breast cancer at diagnosis, including a decreased risk of death due to breast cancer associated with low wine intake (0.75–3.75 drinks/week) among women diagnosed with localized disease and increased risk of breast cancer-specific death associated with high wine intake (10.00–36.00 drinks/week) among those with regional or distant disease. In our analyses, we did not find clear evidence that the disease stage at breast cancer diagnosis modifies the association between wine intake and risk of breast cancer-specific mortality. In general, our results support those reported by Reding et al., which showed that wine consumption before breast cancer diagnosis is associated with lower risk of breast cancer-specific mortality.
Alcohol consumption has been linked to increased risk of developing breast cancer [1, 4, 5], possibly because ethanol increases estrogen levels, inducing DNA damage, and interfering with DNA repair [26,27,28]. Thus, it is plausible to hypothesize that alcohol consumption prior to diagnosis would have an adverse impact on tumor progression and breast cancer recurrence. McCarty CA et al. report that the impact of alcohol consumption on breast cancer risk varies by genotype(s), which are involved in alcohol-metabolizing pathways . For example, they found that alcohol consumption was positively associated with breast cancer risk among women with the GG allele of alcohol dehydrogenase 1B (ADH1B) gene, but appeared to be inversely associated with risk among women with the GA or AA allele. Moreover, many compounds other than ethanol are present in different types of alcoholic beverages and the effects on health outcomes may differ. The association between wine and decreased mortality risk may be due to wine’s high antioxidant levels  or to beneficial effects of other compounds such as resveratrol in red wine . Bioactive constituents in wine (e.g. polyphenols) have been hypothesized to reduce the risk of death after cancer [32, 33]. Quercetin, a flavonoid abundantly present in red wine has also been shown to inhibit tumor growth and increase survival in animal studies .
A major strength of our study is the number of breast cancer deaths, which is greater than those in all previous individual studies on this topic except the CBCS . We collected information on pre-diagnosis alcohol consumption from age 15 until the date of diagnosis, whereas most previous studies collected alcohol consumption for only one time point. We also collected detailed information on potential risk factors for breast cancer incidence and mortality, which enabled us to assess these as potential confounders and effect modifiers. Moreover, our study is one of only a few that have investigated the mortality associations with type of alcohol consumed [6, 7, 9, 19].
This study has several limitations. First, we used self-reported alcohol consumption, which may be inaccurate. Such measurement error, however, would be expected to be non-differential with respect to mortality, resulting in attenuation of the true underlying association. Second, the Women’s CARE Study questionnaire was designed to assess etiologic risk factors for breast cancer and did not collect information on alcohol consumption after diagnosis. While alcohol consumption patterns may change over time, several studies have shown that alcohol consumption does not change following a breast cancer diagnosis [7, 17, 35, 36]. The CBCS  and the WHI  investigated the impact of alcohol consumption before and after breast cancer diagnosis on mortality risk, finding that alcohol consumption before diagnosis was associated with decreased risk of breast cancer-specific mortality (details described above), but consumption after diagnosis was not. Moreover, in a pooled analysis of 9329 breast cancer patients , a meta-analysis of 11 published studies , and a collaborative analysis of 29,239 breast cancer patients , no clear evidence was observed that post-diagnosis alcohol consumption was associated with breast cancer-specific mortality risk. Third, we do not have medical record data on treatment; however, by controlling for age, stage of disease and hormone receptor status, we have accounted for most determinants of treatment, although residual confounding may still exist. Fourth, a comparison of alcohol drinkers to non-drinkers in our study showed that drinkers tended to be younger, premenopausal, white, former or current smokers, and without comorbidities, who had higher education and household income levels and lower BMI. They were also more likely to have localized disease or an ER+ tumor. Some of these factors, such as higher education and household income levels, lack of comorbidities, localized stage at diagnosis, and an ER+ tumor, may be associated with decreased risk of breast cancer-specific mortality. Despite adjusting for these factors in our statistical models, we are unable to rule out residual confounding as the explanation for our results, especially for the observed protective effect of wine consumption. Fifth, a small number of women (n = 231) died of causes other than breast cancer limiting our statistical power to assess the effects of alcohol consumption on other specific causes of death, such as heart disease. Finally, because we lack genotype data, we are unable to determine whether the observed inverse association between alcohol consumption (particularly wine consumption) and risk of breast cancer-specific mortality is modified by genotypic variation (e.g., ADH1B).
Overall, we found no evidence that alcohol consumed over a woman’s life before her breast cancer diagnosis increases her subsequent risk of death from breast cancer. Future studies that incorporate information on types of alcohol consumed before diagnosis, during treatment (if any), and after treatment, are warranted to clarify the somewhat differing results of studies to date.
Availability of data and materials
The data supporting the conclusions of this report are included within the article.
Body mass index
Contraceptive and Reproductive Experiences
International Classification of Diseases for Oncology
Surveillance, Epidemiology and End Results
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We would like to thank Dr. Suzanne G. Folger and other collaborators who contributed to the Women’s CARE Study.
The findings and conclusions in this report are those of the authors and do not necessarily represent the official position of the Centers for Disease Control and Prevention.
Analysis supported by the California Breast Cancer Research Program (Grant No. 15FB-0004 to YL) and the National Cancer Institute (K05 CA136967 to LB). The Women’s Contraceptive and Reproductive Experiences Study was funded by the National Institute of Child Health and Human Development, with additional support from the National Cancer Institute, through contracts with Emory University (Grant No. N01-HD-2-3168), Fred Hutchinson Cancer Research Center (Grant No. N01-HD-2-3166), Karmanos Cancer Institute at Wayne State University (Grant No. N01-HD-3-3174), the University of Pennsylvania (Grant No. N01-HD-3-3176), and the University of Southern California (Grant No. N01-HD-3-3175), and through an intra-agency agreement with the US Centers for Disease Control and Prevention (Grant No. Y01-HD-7022). Support for use of Surveillance, Epidemiology, and End Results cancer registries for case identification was through Grants No. N01-PC-67006 (Atlanta), N01-CN-65064 (Detroit), N01-PC-67010 (Los Angeles), and N01-CN-05230 (Seattle). The funding bodies supported investigators’ time to design the study, collect data, analyze data, interpret results and write the manuscript; they did not have an active role in any of these activities.
Ethics approval and consent to participate
The Women’s CARE Study was approved by the institutional review boards at the CDC, Emory University, Wayne State University, University of Southern California, and Fred Hutchinson Cancer Research Center. Written, informed consent was obtained from all participants in the study prior to data collection. This analysis was approved by the Institutional Review Board at the City of Hope (IRB#: 08098).
Consent for publication
The authors declare that they have no competing interests.
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Ma, H., Malone, K.E., McDonald, J.A. et al. Pre-diagnosis alcohol consumption and mortality risk among black women and white women with invasive breast cancer. BMC Cancer 19, 800 (2019) doi:10.1186/s12885-019-5991-8
- Breast cancer
- White women
- Black women