Abstract
Background
Alcohol consumption is a consistent risk factor for breast cancer, and evidence suggests premenopausal plasma hormones are associated with breast cancer.
Methods
Plasma concentrations of estradiol, estrone, estrone sulfate, testosterone, androstenedione, progesterone, prolactin, dehydroepiandrosterone (DHEA), dehydroepiandrosterone sulphate (DHEAS), and sex hormone-binding globulin (SHBG) were measured in samples collected in 1996-99. Average alcohol intake was calculated from semiquantitative food frequency questionnaires collected in 1995 and 1999. We used generalized linear models to calculate geometric mean hormone concentrations across alcohol categories and the percent difference for the highest vs. lowest category.
Results
Comparing women who consumed >20 g/day with non-drinkers, levels were 25.7% higher for luteal estrone (geometric mean 106 vs. 84.5 pg/mL, trend test p-value=0.001), 27.2% higher for luteal estradiol (182 vs. 143 pg/mL, trend test p-value=0.006), and 16.8% higher for SHBG (85.6 vs. 73.3 nmol/L, trend test p-value =0.03); concentrations of free testosterone were 17.9% lower (0.16 vs. 0.20 ng/dL, trend test p-value=0.002). Women consuming>10g/day compared to non-drinkers had 26.5% higher concentrations of follicular estrone sulfate (950 vs. 751 pg/mL, trend test pvalue=0.04). We did not observe significant associations between alcohol and the other sex hormones evaluated.Significant positive associations were observedwith beer intake, but not other alcohol types, for DHEA (p-interaction=0.003) and androstenedione (p-interaction=0.006).
Conclusion
Alcohol consumption was significantly positively associated with plasma luteal estrogen concentrations, but not with androgen levels, nor estrone or estradiol measured in the follicular phase.
Impact
Differences in premenopausal estrogen levels may contribute to the association between alcohol and breast cancer.
Keywords: Breast cancer, alcohol, sex hormones, premenopausal
Introduction
Alcohol is associated with an increased risk of several chronic conditions, including liver disease and cancer of the oral cavity and pharynx, esophagus, larynx, and colon(1, 2). In addition, alcohol has been consistently shown to increase breast cancer risk (3-8), but the mechanisms underlying this association are unclear. A positive association between plasma sex steroid concentrations and breast cancer risk is well established among postmenopausal women (9-16) but is less consistent among premenopausal women (17-25). However, factors influencing the concentrations of these sex steroids are largely unknown. Alcohol consumption has various effects on estrogen pathways and is associated with decreased menstrual cycle variability and more frequent long cycles (26, 27). Thus, one of the suggested etiologic mechanisms to explain the role of alcohol in breast carcinogenesis is through an effect on circulating sex hormone concentrations.
Among postmenopausal women, associations between alcohol and estrogen concentrations andsex hormone-binding globulin (SHBG) have been inconsistent, while there is more evidence for associations with androgens (28-40). The measurement of hormone concentrations among premenopausal women is complicated by the variation in levels throughout the menstrual cycle. Studies among premenopausal women,with blood samples not specifically timed within the menstrual cycle, have suggested a positive association between alcohol consumption and estrogens (41-43)and androgens (41, 42, 44). Additionally, positive associations between acute alcohol intake and estrone, estradiol and dehydroepiandrosterone sulfate (DHEAS) were observed in a controlled feeding study among 34 premenopausal women (58). However, three small (N<220) studies of alcohol and sex hormones among premenopausal women with samples timed in the menstrual cycle have been inconsistent (45-47). Furthermore, to our knowledge, no study has examined associations by type of alcohol consumed.
With the availability of samples carefully timed within the menstrual cycle, the Nurses' Health Study II (NHSII) provides a unique opportunity to assess estrogen concentrations in both the follicular and luteal phase and to evaluate associations by alcohol type in a large sample of premenopausal women. Therefore, we conducted a cross-sectional analysis of total alcohol consumption and type of alcohol consumed with plasma sex steroid concentrations, prolactin and SHBG among 2,000 premenopausal women in the NHSII.
Materials and Methods
Study Population
The NHSII was established in 1989 among 116,430 female registered nurses, aged 25 to 42 years. Women completed a baseline questionnaire and are followed biennially to assess exposure and disease diagnoses. A total of 29,611 participants in NHSII (ages 32-54 years) provided blood samples between 1996 and 1999. Details of the blood collection procedure are described in a prior publication (28). Premenopausal women who had not taken oral contraceptives nor been pregnant or breastfed within 6 months, completed a short questionnaire and provided blood samples in the early follicular (3rd-5th day) and the mid-luteal (7-9 days before expected start of their next cycle) phases of the menstrual cycle. Participants aliquoted and froze follicular plasma 8-24 hours after collection. Timed follicular and luteal samples were available for 18,521 of the women. A single untimed blood sample was provided for the remaining 11,090 women and all samples were shipped overnight on ice and processed by our laboratory into plasma, red blood cell, and white blood cell components. Samples have been stored in continuously monitored liquid nitrogen freezers since collection. The stability of sex hormones using these blood collection methods has been previously established (48).
Participants in this cross-sectional analysis served as controls in nested case-control studies of breast cancer (n=1,256)(49), ovarian cancer (n=44)(50), endometriosis (n=574), and rheumatoid arthritis (n=18)(51), or as participants in a hormone reproducibility study (n=108)(48). A total of 2,000 premenopausal women with measured estradiol, estrone, estrone sulfate, progesterone, testosterone, androstenedione, SHBG, dehydroepiandrosterone (DHEA), DHEAS and prolactin who provided information on alcohol consumption on either the 1995 or the 1999 questionnaire were included in this study. This study was approved by the Committee on the Use of Human Subjects in Research at the Brigham and Women's Hospital (Boston, MA).
Laboratory Assays
Laboratory assay methods used to quantify the concentrations of estrogens, androgens, progesterone and prolactin have been described previously (10, 52). Briefly, estrone, estradiol, and estrone sulfate were assayed in luteal and follicular samples. Testosterone, androstenedione and prolactin concentrations were assayed in luteal and/or follicular samples as well as untimed samples. Progesterone was measured in luteal samples, and DHEA, DHEAS and SHBG were measured in luteal and untimed samples. Sex hormones, prolactin and SHBG concentrations were measured in different batches at different laboratories. Assays were performed at Quest Diagnostics (San Juan Capistrano, CA) for 3 batches of estrogens, 5 batches of testosterone, 2 batches of androstenedione and 1 batch of progesterone. Radioimmunoassay (RIA) following organic extraction and celite column chromatography were used to assay estrogens and testosterone. Estrone sulfate was assessed by RIA of estrone, after extraction of estrone, enzyme hydrolysis, and column chromatography. RIA was also used to assay androstenedione. Progesterone was assayed by RIA preceded by organic extraction. Four batches of estrogens and testosterone were assayed at Mayo Medical Laboratories using liquid chromatography-tandem mass spectrometry. Two batches of DHEA and androstenedione and four batches of DHEAS, SHBG and progesterone were assayed at the Royal Marsden Hospital. Androstenedione was assayed by RIA and DHEAS, SHBG and progesterone were assayed by chemiluminescent enzyme immunoassay. One batch of progesterone (RIA) and three batches of SHBG (chemiluminescent enzyme immunometric assay) were assayed at Massachusetts General Hospital (Boston, MA) and one batch of SHBG and progesterone were assayed at the Children's Hospital Boston. Prolactin was measured using microparticle enzyme immunoassay at the Massachusetts General Hospital, by the AxSYM Immunoassay system. C-peptide and insulin-like growth factor (IGF1) were measured from plasma samples by enzyme-linked immunosorbent assay (Diagnostic Systems Laboratory, Webster, TX) in the laboratory of Dr. Michael Pollak (McGill University, Montréal, Québec, Canada).We included 10% blinded replicates in each batch to assess laboratory precision. Within-batch coefficients of variation were between 2-15% for all analytes, except for a single batch of progesterone (17%).
Exposure and covariate measurement
Alcohol consumption was assessed by a semi-quantitative food frequency questionnaire, administered in 1995 and 1999, and included separate items for regular beer, light beer, white wine, red wine and liquor consumption. Alcohol consumption of the past year was assessed for wine, beer and liquor in nine categories ranging from “none or < 1/month” to “40+/week”. Total alcohol consumption was calculated as the sum of the intake by alcohol beverage type. For this analysis, we calculated alcohol consumption as an average of the frequencies from the 1995 and 1999 questionnaires; results were similar when we restricted to 1995 consumption and are not presented here. If information on alcohol was missing on one of the questionnaires, information from the other was used. From the reported frequency, we calculated grams/day of alcohol consumed and categorized it for analyses: none (reference), 0.1-10.0 grams/day, 10.1-20.0 grams/day, and > 20 grams/day. For follicular and luteal estrone sulfate, DHEA and androstenedione, where we had a smaller sample size, we used a highest category of alcohol consumption of > 10 grams/day. Further, we evaluated the associations between the type of alcohol consumed (beer, wine, liquor) and sex steroid concentrations using categories of <1, 1-4, and ≥5 drinks/week. The correlations between the different alcohol types in our study population were weak to moderate, with Spearman correlation coefficients of 0.28, p<0.0001 between beer and liquor, 0.41, p<0.0001 between beer and wine, and 0.39, p<0.0001 between wine and liquor consumption.
We evaluated age, smoking, body mass index (BMI), height, age at menarche, usual menstrual cycle length and pattern, parity, age at first birth, breastfeeding history, oral contraceptive use, family history of breast cancer, benign breast disease diagnosis, and physical activity as potential confounders of the association between alcohol consumption and sex steroid concentrations. Information on current weight, age and blood collection date, time and fasting status were reported on the questionnaire at blood collection. Age at menarche, height, and family history of breast cancer were reported on the baseline questionnaire in 1989. Usual menstrual cycle length and pattern were ascertained in 1993. Information on breastfeeding history, duration of oral contraceptive use, age at first birth, parity, benign breast disease history, smoking status, and physical activity were reported on the 1997 questionnaire. BMI was calculated from weight in kilograms from the questionnaire at blood collection divided by height in meters squared from the baseline questionnaire in 1989.
Statistical Analyses
Because sex steroid hormone levels vary throughout the menstrual cycle, we evaluated the estrogens in the follicular and luteal phases separately, and progesterone in the luteal phase. We used the average of the follicular and luteal blood sample values, when available, for testosterone, free testosterone, androstenedione and prolactin as concentrations did not vary substantially by menstrual phase and the average concentration more accurately represents long-term levels (48, 53). Statistical outliers in hormone concentrations were identified using the generalized extreme Studentized deviate (ESD) many-outlier detection approach(54); 0 (estrone sulfate, DHEA, DHEAS) to 13 (prolactin) extreme values were excluded from the analyses. We noticed batch-to-batch variation in our quality control samples and adjusted for batch according to the methods described by Rosner et al (55), as we have used previously(56).
We used generalized linear models to calculate geometric mean hormone concentrations across alcohol consumption categories standardized to the marginal distribution of the covariates and estimated the percent difference and 95% confidence intervals contrasting the means for the highest vs. lowest category of alcohol consumption. Contrast tests were used to assess statistical differences in associations by alcohol type (beer, wine, and liquor) (57). We modeled continuous alcohol consumption using medians of the categories and examined linear trends with the Wald test. Potential confounders were included in the model based on our prior knowledge of factors associated with alcohol intake and sex steroid concentrations. The final model included age at blood draw, BMI, smoking status, race, age at menarche, parity, and physical activity as categorized in the Table 3 footnote. We additionally included the date and time of day of blood collection, and fasting status in the model to reduce extraneous variation. We evaluated usual menstrual cycle length and pattern, height, biopsy-confirmed benign breast disease, family history of breast cancer, breastfeeding history, and BMI at age 18 as potential covariates, but their inclusion in the model did not change our results, so they were not retained. Models that included luteal or average of timed samples also were adjusted for the difference between luteal blood draw date and date of next menstrual period.
Table 3. Adjusted geometric mean concentrationa of hormones by categories of average alcohol consumption among 2,000 premenopausal women in the Nurses' Health Study II.
Hormone | N | Total alcohol intake (g/day) | p-valuetrend | Percent differenceb and 95% CI | |||
---|---|---|---|---|---|---|---|
| |||||||
0 | 0.1-10.0 | 10.1-20.0 | >20 | ||||
Range N | (130-618) | (251-1,162) | (55-157) | (38-63) | |||
Follicular Estradiol (pg/mL) | 1,405 | 69.7 | 66.8 | 63.0 | 113 | 0.07 | 62.1% (6.4%, 147%) |
Luteal Estradiol (pg/mL) | 1,533 | 143 | 156 | 166 | 182 | 0.006 | 27.2% (5.4%, 53.5%) |
Follicular Free Estradiol | 1,369 | 0.74 | 0.71 | 0.70 | 0.71 | 0.66 | -4.0% (-29.7%, 30.9%) |
Luteal Free Estradiol | 1,517 | 1.81 | 1.89 | 2.01 | 2.01 | 0.10 | 11.5% (-6.4%, 32.8%) |
Follicular Estrone (pg/mL) | 1,425 | 46.9 | 46.3 | 44.8 | 53.8 | 0.25 | 14.9% (-2.5%, 35.3%) |
Luteal Estrone (pg/mL) | 1,580 | 84.5 | 91.7 | 94.8 | 106 | 0.001 | 25.7% (9.7%, 44.0%) |
Follicular estrone sulfate (pg/mL) | 444 | 751 | 801 | 950 | - | 0.04 | 26.5% (1.8%, 57.4%) |
Luteal estrone sulfate (pg/mL) | 449 | 1,513 | 1,605 | 1,900 | - | 0.10 | 25.6% (-4.4%, 65.0%) |
Luteal Progesterone (ng/dL) | 1,596 | 1,220 | 1,252 | 1,193 | 1,334 | 0.64 | 9.4% (-8.5%, 30.8%) |
DHEA (ng/dL)c | 476 | 919 | 845 | 826 | - | 0.35 | -10.1% (-24.1%, 6.5%) |
DHEAS (μg/dL)c | 1,244 | 131 | 125 | 121 | 152 | 0.30 | 16.4% (-4.5%, 42.0%) |
Testosterone (ng/dL)d | 1,967 | 23.9 | 23.9 | 23.0 | 23.7 | 0.52 | -0.7% (-11.5%, 11.5%) |
Free testosterone (ng/dL)d | 1,908 | 0.20 | 0.19 | 0.18 | 0.16 | 0.002 | -17.9% (-28.4%, -5.9%) |
Androstenedione (ng/dL)d | 627 | 131 | 128 | 128 | - | 0.81 | -2.1% (-12.2%, 9.1%) |
Prolactin (ng/dL)d | 1,303 | 21.9 | 21.4 | 24.0 | 23.2 | 0.11 | 5.9% (-10.0%, 24.7%) |
SHBG (nmol/L)d | 1,926 | 73.3 | 75.5 | 74.4 | 85.6 | 0.03 | 16.8% (4.5%, 30.5%) |
All geometric mean concentrations are adjusted for age at blood collection (continuous), BMI at blood collection (continuous), smoking (never smoker, past smoker with >= 5 years since quitting, past smoker with <5 years since quitting, current smoker of <15 cigarettes per day, current smoker of 15+ cigarettes per day), duration of past oral contraceptive use (never, <4 years, 4+ years), age at first birth/parity (nulliparous, 1-2 children and age at first birth < 25 years, 1-2 children and age at first birth >25 years,>3 children and age at first birth < 25 years,>3 children and age at first birth > 25 years), age at menarche (<12, 12-13, >13 years), and physical activity in MET-hours/week (continuous), date of blood collection (month/year, < 1/97, 2/97-1/98, 2/98-1/99, >2/99), time of day of blood collection (1-8 a.m., 9 a.m. to noon, 1-4p.m., 5p.m. to midnight) and fasting status (<10, >10 hours). Models that included luteal or average of timed samples also were adjusted for the difference between luteal blood draw date and date of next menstrual period (3-7, 8-12, 13-17, 18-21 days, unknown/untimed).
Percent difference for highest category of alcohol use vs. no alcohol use
Luteal/untimed
Average of follicular and luteal measures, or untimed
Geometric mean concentration of follicular estrone sulfate, luteal estrone sulfate, DHEA, and androstenedione reflect liquor intake of 1+ grams/day in highest category of alcohol use
We assessed whether associations of alcohol with hormone concentrations varied by BMI at blood draw (<25 vs. ≥25 kg/m2), age (<45 vs. ≥45 years) and by menstrual cycle phase (follicular vs. luteal) for the estrogen models. The Wald test was used to test for modification by including interaction terms between BMI, age, or menstrual cycle phase and a continuous alcohol intake variable weighted by the median of alcohol use in each category.We conducted a priori sensitivity analyses among non-smokers only and among women whose timed samples were collected during an ovulatory cycle (defined by luteal progesterone≥400 ng/dL).As SHBG is strongly inversely correlated with BMI (42), we explored the possibility that alcohol may affect SHBG through insulin sensitivity by conducting secondary analyses restricted to women with these measures (c-peptide, n=665; IGF1, n=667) and adjusting for c-peptide and IGF1 along with batch in the full model. All statistical tests were two-sided, and were considered statistically significant at p-value<0.05All analyses were performed using SAS software, version 9.2 (SAS Institute Inc., Cary, N.C.).
Results
The mean age at blood draw for our study population was 42.7 years, and the mean BMI was 26.1 kg/m2. Reported alcohol consumption ranged from 0 to 67.9 grams/day with an average among drinkers of 5.6 grams per day (∼ 2-3 drinks/week). Compared with non-drinkers, women who consumed the highest quantities of alcohol were more likely to be current smokers, physically active, have past oral contraceptive use, and report a regular menstrual cycle pattern (Table 1). Alcohol drinkers were also slightly older at first birth and were less likely to be parous as compared to non-drinkers. The distributions of the plasma sex hormones, prolactin and SHBG concentrations are displayed in Table 2. The Spearman rank correlation coefficients between the hormone concentrations ranged from 0.001 for DHEAS and luteal estradiol to 0.90 for follicular free estradiol and follicular total estradiol, with a median correlation coefficient of 0.12 (Supplementary Table 1).
Table 1. Characteristics at blood draw of 2,000 premenopausal women in the Nurses' Health Study II.
|
||||
---|---|---|---|---|
Average alcohol consumption (grams per day) | ||||
| ||||
None | 0.1-10.0 | 10.1-20.0 | >20.0 | |
(n=618) | (n=1,162) | (n=157) | (n=63) | |
Age in years (mean, sd) | 42.7 (4.0) | 42.7 (4.0) | 43.1 (4.0) | 43.7 (4.1) |
Body mass index, kg/m2 (mean, sd) | 26.8 (7.0) | 25.9 (7.1) | 24.4 (5.9) | 25.0 (5.8) |
Body mass index at age 18, kg/m2 (mean, sd) | 21.4 (3.3) | 21.1 (3.1) | 20.4 (2.2) | 20.8 (2.4) |
Height in inches (mean, sd) | 64.9 (2.8) | 64.9 (2.5) | 65.5 (2.7) | 65.3 (2.5) |
Physical Activity in MET-hrs/week (mean, sd) | 14.9 (15.5) | 18.8 (18.0) | 21.9 (18.6) | 24.4 (22.1) |
Parous (%) | 84.6 | 80.3 | 72.0 | 76.2 |
Paritya (mean, sd) | 2.4 (1.0) | 2.3 (0.9) | 2.3 (1.0) | 2.2 (0.9) |
Age at first birtha (mean, sd) | 26.4 (4.4) | 26.8 (4.4) | 26.7 (4.7) | 27.3 (4.1) |
Past oral contraceptive use (%) | 82.4 | 85.9 | 87.9 | 92.1 |
Past breast feeding history (%) | 68.9 | 68.1 | 61.2 | 68.3 |
Current smoker (%) | 5.7 | 7.4 | 17.2 | 17.5 |
Family history of breast cancer (%) | 7.8 | 10.2 | 11.5 | 9.5 |
Benign breast disease history (%) | 16.2 | 17.3 | 17.8 | 17.5 |
Caucasian (%) | 94.7 | 93.9 | 95.5 | 95.2 |
Age at menarche between 12-13 years (%) | 61.7 | 58.1 | 61.2 | 60.3 |
Usual menstrual cycle pattern regular (%) | 89.3 | 93.1 | 93.3 | 93.6 |
Among parous women
Table 2. Plasma hormone concentrations among 2,000 premenopausal women in the Nurses' Health Study II.
Plasma hormone | N | Median (10th-90th percentile) |
---|---|---|
Follicular Estradiol (pg/mL) | 1,405 | 46.7 (22.1 -101) |
Luteal Estradiol (pg/mL) | 1,533 | 134 (72.4 - 237) |
Follicular Free Estradiol (pg/mL) | 1,369 | 0.58 (0.30- 1.18) |
Luteal Free Estradiol (pg/mL) | 1,517 | 1.69 (0.93- 2.86) |
Follicular Estrone (pg/mL) | 1,425 | 40.6 (25.0- 67.7) |
Luteal Estrone (pg/mL) | 1,580 | 84.3 (51.1-142) |
Follicular Estrone sulfate (pg/mL) | 444 | 661 (299- 1,517) |
Luteal Estrone sulfate (pg/mL) | 449 | 1,454 (573- 3,326) |
Luteal Progesterone (ng/dL) | 1,596 | 1,397 (250- 2,695) |
DHEA (ng/dL)a | 476 | 614 (346 -1,127) |
DHEAS (μg/dL)a | 1,244 | 86.9 (39.5- 163) |
Testosterone (ng/dL)b | 1,967 | 23.5 (14.2 -36.8) |
Free testosterone (ng/dL)b | 1,908 | 0.20 (0.10- 0.37) |
Androstenedione (ng/dL)b | 627 | 99.6 (60.1 - 164) |
Prolactin (ng/dL)b | 1,303 | 14.5 (8.3 -28.7) |
SHBG (nmol/L)b | 1,926 | 64.6 (32.5 - 116) |
Luteal/untimed
Average of follicular and luteal measures, or untimed
The geometric mean concentrations of plasma sex steroids, prolactin, and SHBG across alcohol consumption categories are shown in Table 3. Alcohol consumption was positively associated with concentrations of luteal estradiol (trend test p-value=0.006), luteal estrone (trend test p-value =0.001), and SHBG (trend test p-value=0.03) and was inversely associated with concentrations of free testosterone (trend test p-value =0.002). Compared with non-drinkers, hormone levels for women who consumed > 20 g/day were 27.2% higher for luteal estradiol (182 vs. 143 pg/mL), 25.7% higher for luteal estrone (geometric mean 106 vs. 84.5 pg/mL), and 16.8% higher for SHBG (85.6 vs. 73.3 nmol/L); concentrations of free testosterone were 17.9% lower (0.16 vs. 0.20 ng/dL). Compared with non-drinkers, women consuming >10g/day had 26.5% higher concentrations of follicular estrone sulfate (950 vs. 751 pg/mL, trend test p-value =0.04). Although trends were not statistically significant (trend test p-values=0.07-0.25), hormone concentrations for women consuming >20 g/day were 62.1% higher for follicular estradiol, 14.9% higher for follicular estrone, and 25.6% higher for luteal estrone sulfate compared to non-drinkers. Interaction terms between alcohol and menstrual cycle phase were not significant for estradiol, estrone and estrone sulfate (p=0.26-0.88). We did not observe significant associations between alcohol and testosterone, androstenedione, progesterone, DHEA or DHEAS.
The observed associations did not differ substantially by age, BMI, or when restricted to samples collected during ovulatory cycles or among non-smokers only (data not shown). Although we observed a significant interaction between age and alcohol for the association with progesterone levels, this interaction was no longer significant when we restricted the sample to ovulatory women (p=0.68). To ensure that the results were robust after eliminating potential outliers with heavier alcohol consumption, we conducted a sensitivity analysis, excluding nine women who reported >3 drinks/day. Results from this analysis were consistent with our overall findings, suggesting that the observed associations are not being driven by the heavy alcohol drinkers in our study population.In secondary analysis restricted to women with plasma c-peptide and IGF1 measures, the association between alcohol and SHBG was only slightly attenuated with adjustment for these biomarkers.
The associations between wine consumption and plasma sex hormone concentrations were similar to the overall results (Table 4). Compared with non-drinkers of any alcohol, women who consumed ≥5 glasses of wine per week had 17.3% higher concentrations of luteal estradiol (p-trend=0.05), and 9.1% lower concentrations of free testosterone (trend test p-value =0.02). Women who consumed ≥5 glasses of beer per week had 5.1% higher concentrations of DHEA (trend test p-value =0.04), 12.3% higher concentrations of androstenedione (trend test p-value =0.01) as compared to non-drinkers. We did not observe any significant trends with liquor consumption after adjusting for other alcohol types; however we had few liquor drinkers. Positive trends for wine consumption remained significant after adjustment for beer and liquor consumption across all hormones. For beer drinkers, significant positive trends with luteal estradiol, luteal free estradiol, free testosterone, and SHBG were no longer significant, while positive trends for DHEA and androstenedione became significant, after adjustment for other beverage types. Positive trends for liquor consumption and luteal estradiol, luteal estrone, and SHBG were no longer evident after adjusting for wine and beer intake. Significant differences in associations by alcohol type were observed only for DHEA (p=0.003) and androstenedione (p=0.006).
Table 4. Adjusted geometric mean concentration of hormonesa bycategories of average alcohol type among 2,000 premenopausal women in the Nurses' Health Study II.
Total alcohol intake by type b | |||||||
---|---|---|---|---|---|---|---|
(# drinks per week) | p for trend adjusted for other type c | Percent differenced and 95% CI | |||||
Hormone and category | N | Non-drinker | <1 | 1-4 | 5+ | ||
4A. Total wine | |||||||
Range N | (130-618) | (99-452) | (117-524) | (62-225) | |||
Follicular Estradiol (pg/mL) | 1,403 | 80.9 | 74.7 | 72.9 | 91.3 | 0.31 | 12.9% (-8.3%, 38.9%) |
Luteal Estradiol (pg/mL) | 1,531 | 142 | 159 | 153 | 168 | 0.05 | 17.3% (6.4%, 29.3%) |
Follicular Free Estradiol (pg/mL) | 1,367 | 0.82 | 0.79 | 0.75 | 0.86 | 0.24 | 5.5% (-9.3%, 22.8%) |
Luteal Free Estradiol (pg/mL) | 1,515 | 1.79 | 1.97 | 1.85 | 1.93 | 0.51 | 7.3% (-2.3%, 17.8%) |
Follicular Estrone (pg/mL) | 1,423 | 49.4 | 48.4 | 47.9 | 49.9 | 0.79 | 1.1% (-8.4%, 11.5%) |
Luteal Estrone (pg/mL) | 1,578 | 83.7 | 91.7 | 92.6 | 95.2 | 0.13 | 12.7% (4.2%, 21.8%) |
Follicular estrone sulfate (pg/mL) | 444 | 795 | 826 | 915 | 961 | 0.28 | 20.9% (-3.6%, 51.6%) |
Luteal estrone sulfate (pg/mL) | 449 | 1,524 | 1,655 | 1,585 | 1,706 | 0.63 | 13.0% (-12.6%, 46.0%) |
Luteal Progesterone (ng/dL) | 1,595 | 1,217 | 1,214 | 1,304 | 1,217 | 0.53 | -1.0% (-10.8%, 9.9%) |
DHEA (ng/dL)e | 386 | 916 | 887 | 836 | 847 | 0.20 | -8.2% (-21.9%, 7.9%) |
DHEAS (μg/dL)e | 1,085 | 128 | 119 | 127 | 130 | 0.72 | 1.1% (-9.3%, 12.8%) |
Testosterone (ng/dL)f | 1,967 | 24.0 | 23.7 | 23.7 | 24.2 | 0.86 | 0.7% (-5.2%, 7.0%) |
Free testosterone (ng/dL)f | 1,906 | 0.20 | 0.19 | 0.19 | 0.18 | 0.02 | -9.1% (-16.1%, -1.4%) |
Androstenedione (ng/dL)f | 627 | 131 | 131 | 124 | 132 | 0.88 | 0.9% (-.8.6%, 11.3%) |
Prolactin (ng/dL)f | 1,301 | 22.0 | 22.0 | 20.6 | 23.1 | 0.85 | 4.7% (-7.0%, 18.0%) |
SHBG (nmol/L)f | 1,682 | 73.0 | 75.7 | 74.9 | 77.9 | 0.36 | 6.1% (-1.5%, 14.2%) |
4B. Total beer | |||||||
Range N | (130-618) | (64-310) | (78-368) | (26-120) | |||
Follicular Estradiol (pg/mL) | 1,402 | 78.5 | 82.0 | 69.9 | 86.8 | 0.94 | 10.6% (-21.0%, 54.9%) |
Luteal Estradiol (pg/mL) | 1,530 | 144 | 150 | 161 | 166 | 0.23 | 15.7%(2.7%, 30.4%) |
Follicular Free Estradiol (pg/mL) | 1,366 | 0.81 | 0.80 | 0.75 | 0.75 | 0.26 | -7.9% (-26.7%, 15.9%) |
Luteal Free Estradiol (pg/mL) | 1,514 | 1.81 | 1.83 | 1.93 | 1.99 | 0.35 | 10.3% (-4.3%, 27.0%) |
Follicular Estrone (pg/mL) | 1,422 | 48.9 | 52.3 | 46.6 | 50.4 | 0.76 | 3.1% (-9.3%, 17.2%) |
Luteal Estrone (pg/mL) | 1,577 | 84.4 | 92.4 | 95.2 | 95.3 | 0.15 | 13.0% (1.8%, 25.4%) |
Follicular estrone sulfate (pg/mL) | 444 | 763 | 912 | 1032 | 836 | 0.49 | 9.6% (-16.8%, 44.4%) |
Luteal estrone sulfate (pg/mL) | 449 | 1,502 | 1,702 | 1,606 | 1,690 | 0.76 | 12.5% (-15.5%, 49.9%) |
Luteal Progesterone (ng/dL) | 1,594 | 1,229 | 1,211 | 1,281 | 1,352 | 0.10 | 10.0%(-3.2%, 25.1%) |
DHEA (ng/dL)e | 386 | 913 | 804 | 943 | 960 | 0.04 | 5.1% (-13.5%, 27.7%) |
DHEAS (μg/dL)e | 1,085 | 127 | 125 | 130 | 124 | 0.62 | -2.2% (-16.6%, 14.9%) |
Testosterone (ng/dL)f | 1,966 | 23.8 | 24.4 | 24.7 | 23.8 | 0.36 | -0.1% (-8.0%, 8.5%) |
Free testosterone (ng/dL)f | 1,905 | 0.20 | 0.20 | 0.20 | 0.18 | 0.87 | -9.7%(-18.3%, -0.3%) |
Androstenedione (ng/dL)f | 627 | 130 | 134 | 135 | 147 | 0.01 | 12.3% (-3.9%, 31.1%) |
Prolactin (ng/dL)f | 1,301 | 21.6 | 23.3 | 21.3 | 24.0 | 0.08 | 11.1% (-4.5%, 29.4%) |
SHBG (nmol/L)f | 1,681 | 73.5 | 74.4 | 75.1 | 79.2 | 0.39 | 7.8%(-1.6%, 18.1%) |
4C. Liquor | |||||||
Range N | (130-618) | (81-374) | (46-169) | (20-34) | |||
Follicular Estradiol (pg/mL) | 1,400 | 78.5 | 71.5 | 83.3 | 103 | 0.39 | 30.8% (-35.9%, 167%) |
Luteal Estradiol (pg/mL) | 1,528 | 143 | 163 | 154 | 172 | 0.42 | 20.1% (0.6%, 43.2%) |
Follicular Free Estradiol (pg/mL) | 1,364 | 0.81 | 0.74 | 0.85 | 0.64 | 0.41 | -21.4% (-40.8%, 4.2%) |
Luteal Free Estradiol (pg/mL) | 1,512 | 1.80 | 1.93 | 1.82 | 1.96 | 0.97 | 8.7% (-9.8%, 31.1%) |
Follicular Estrone (pg/mL) | 1,420 | 49.1 | 47.3 | 53.5 | 47.6 | 0.54 | -3.1% (-20.7%, 18.5%) |
Luteal Estrone (pg/mL) | 1,575 | 84.3 | 94.8 | 91.6 | 107 | 0.13 | 27.2% (2.5%, 57.7%) |
Follicular estrone sulfate (pg/mL) | 443 | 801 | 833 | 960 | - | 0.63 | 19.8% (-3.9%, 49.5%) |
Luteal estrone sulfate (pg/mL) | 448 | 1,503 | 1,646 | 1,732 | - | 0.48 | 15.2% (-11.6%, 50.3%) |
Luteal Progesterone (ng/dL) | 1,592 | 1,226 | 1,236 | 1,266 | 1,231 | 0.89 | 0.4%(-20.8%, 27.3%) |
DHEA (ng/dL)e | 385 | 943 | 892 | 935 | - | 0.41 | -0.9%(-15.8%, 16.8%) |
DHEAS (μg/dL)e | 1,082 | 131 | 139 | 139 | 122 | 0.44 | -6.8% (-25.8%, 17.1%) |
Testosterone (ng/dL)f | 1,963 | 23.9 | 24.7 | 23.8 | 23.4 | 0.93 | -2.1% (-14.1%, 11.5%) |
Free testosterone (ng/dL)f | 1,902 | 0.20 | 0.20 | 0.19 | 0.19 | 0.78 | -5.0% (-19.2%, 11.6%) |
Androstenedione (ng/dL)f | 627 | 130 | 133 | 124 | - | 0.40 | -4.7%(-14.9%, 6.6%) |
Prolactin (ng/dL)f | 1,298 | 21.7 | 21.0 | 20.6 | 26.3 | 0.71 | 21.0% (-17.0%, 76.3%) |
SHBG (nmol/L)f | 1,678 | 73.3 | 77.4 | 75.7 | 80.0 | 0.39 | 9.1%(-6.2%, 26.9%) |
All geometric mean concentrations are adjusted for age at blood collection (continuous), BMI at blood collection (continuous), smoking (never smoker, past smoker with >= 5 years since quitting, past smoker with <5 years since quitting, current smoker of <15 cigarettes per day, current smoker of 15+ cigarettes per day), duration of past oral contraceptive use (never, <4 years, 4+ years), age at first birth/parity (nulliparous, 1-2 children and age at first birth < 25 years, 1-2 children and age at first birth > 25 years, >3 children and age at first birth < 25 years, >3 children and age at first birth > 25 years), age at menarche (<12, 12-13, >13 years), and physical activity in MET-hours/week (continuous), date of blood collection (month/year, ≤ 1/97, 2/97-1/98, 2/98-1/99, ≥2/99), time of day of blood collection (1-8 a.m., 9 a.m. to noon, 1-4p.m., 5p.m. to midnight) and fasting status (<10, ≥10 hours). Models that included luteal or average of timed samples also were adjusted for the difference between luteal blood draw date and date of next menstrual period (3-7, 8-12, 13-17, 18-21 days, unknown/untimed).
Total alcohol by type excludes women who only drank other alcohol types
p-for trend across alcohol category including all women and adjusting for other alcohol types
Percent difference for highest category of alcohol use vs. no alcohol use
Luteal/untimed
Average of follicular and luteal measures, or untimed
Geometric mean concentration of follicular estrone sulfate, luteal estrone sulfate, DHEA, and androstenedione reflect liquor intake of 1+ drinks per week in highest category of alcohol use
We observed significant differences between red and white wine for androstenedione (p=0.02), and suggestive differences between regular and light beer for follicular estradiol (p=0.05) (data not shown). Women who reported ≥5 glasses of white wine per week had 6.3% lower concentrations of androstenedione compared to non-drinkers (p-trend=0.06), with no suggestive trends among red wine drinkers. Follicular estradiol levels were 36.1% higher for light beer drinkers who consumed ≥5 drinks/week as compared to non-drinkers (p-trend=0.06) and a positive trend was not significant for regular beer drinkers (p-trend=0.12).
Discussion
In this large cross-sectional study among premenopausal women, we observed strong positive associations between alcohol consumption and circulating concentrations of luteal estrogens and SHBG and an inverse association between alcohol and free testosterone levels. Although there were few heavy drinkers, the associations appeared linear and significant changes in hormone levels were observed even among women with modest alcohol consumption. 60.1% of women in our cohort drank wine, and the associations with wine consumption were similar to the total alcohol results. Our results suggest potential differences in associations with sex steroid concentrations for beer and liquor, although these findings are based on smaller numbers.
Previous cross-sectional studies of premenopausal women (range n=205-2,719), including a large collaborative paper with 471 of the 2,000 NHSII women in the current analysis, have observed suggestive or significant positive associations between alcohol and circulating estrogens (41, 42, 45, 47). However, in cross-sectional studies with samples timed in the menstrual cycle, consistent associations with luteal estrogens have not been observed. In two small studies (n=205, 218) suggestive positive associations were observed between alcohol and plasma luteal estradiol (47)(45), with a significant linear trend in one of the studies when estradiol concentrations were averaged across the menstrual cycle (45). A smaller study of 107 women found no associations of alcohol with estrone, estradiol and estrone sulfate regardless of menstrual cycle phase (46). In a small controlled feeding study of 34 women, positive associations were only evident between alcohol and ovulatory (days 12-15 of menstrual cycle) estrogens, but not follicular or luteal samples (58). Our study is the largest, to our knowledge, to evaluate associations by menstrual timing, and our findings of a positive association with estrogens are consistent with the larger cross-sectional studies and with some of the suggestive luteal estrogen associations in the smaller studies. While our findings support a positive association between alcohol and luteal estrogens, results for follicular measures were generally similar, although not necessarily statistically significant. Further, we did not find any evidence of interaction by menstrual cycle phase for the associations between alcohol and estradiol, estrone, and estrone sulfate. Although follicular and luteal estrogen levels are not similar, and may reflect different sources (59-61), it is unclear why alcohol would have differential effects by phase and specific estrogens. Thus, additional studies are warranted to better understand whether associations of alcohol and estrogens differ by menstrual cycle phase.
Positive associations between alcohol and androstenedione, DHEAS, and testosterone have been observed in several large studies among premenopausal women (41, 42), while smaller studies, although also supportive, have varied in the specific androgen that was significant (44-46). Additionally, acute effects of alcohol were evident for at least one of the androgens in the small controlled feeding study (58). However, our study did not observe any positive associations between overall alcohol intake and androgens. Further, while a positive association has been observed in other studies for free testosterone (41, 42); we observed lower concentrations of free testosterone among drinkers in our study population. The inverse association we observed with free testosterone likely was driven by the positive association between alcohol intake and SHBG concentrations, while studies that observed positive associations with free testosterone did not report elevated concentrations of SHBG among drinkers. Inconsistencies in results from other studies may be partially explained by differences in alcohol type consumed. Although we did not observe associations with androstenedione and DHEA overall, these androgens were higher among beer drinkers compared with non-drinkers. While prior studies have not examined associations by alcohol type, our results suggest differences in the type of alcohol consumed may be important.
Alcohol consumption has been inversely related to insulin sensitivity markers(62), which are inversely associated with SHBG concentrations (63). However, the positive association we observed between alcohol and SHBG was only slightly attenuated when we adjusted for concentrations of c-peptide and IGF1, suggesting that our findings are not entirely explained by alcohol-induced alterations in these markers. SHBG concentrations are positively correlated with estradiol levels in premenopausal women (48, 64), and the previous studies that have not observed an association between alcohol and SHBG levels among premenopausal women (41, 42, 46, 65, 66), also have not observed associations with estrogen levels. Further, SHBG concentrations among premenopausal women have not been associated with breast cancer risk (19, 42). Thus, our finding of a positive association between alcohol and SHBG is not likely to be mediating the effect of alcohol on breast cancer risk, but rather it may be correlated with the higher estradiol concentrations evident among drinkers in our study population.
Our study is the first, to our knowledge, to examine associations between specific types of alcohol and premenopausal hormone levels. Although the majority of women in our cohort were wine drinkers, we nevertheless observed significant associations with androstenedione and DHEA concentrations among beer drinkers. Beer drinkers were not substantially different from wine drinkers in our population, though they were more likely to smoke cigarettes. Although few women in this study consumed liquor, our differential findings between wine and beer drinkers suggest that the type of alcohol beverage may be important. Consumption by alcohol type is not reported in prior studies, and it is possible that differences in the distribution of beer and wine consumption across study populations could partially explain discrepancies between our findings and other studies with regard to androgens. Thus, further exploration of potential differences in associations of sex steroid concentrations by alcohol type is warranted.
While postmenopausal hormone concentrations have been consistently linked with breast cancer risk(9-16), the role of premenopausal hormone concentrations in relation to breast cancer is not well understood(17-24). In our recent analysis, we observed suggestive positive associations between luteal estradiol concentrations with estrogen receptor (ER) positive and progesterone receptor (PR) positive breast cancers, but no strong associations for other estrogens (18). A recent pooled analysis of data from seven prospective studies also demonstrateda positive association between estrogen concentrations and breast cancer risk among premenopausal women (42). Therefore, our findings of increased concentrations of luteal estrogens among premenopausal women who consumed alcohol suggest that the association between alcohol consumption and breast cancer risk may be partially mediated by alterations in sex steroid concentrations.
Strengths of this study include the large sample size, the ability to evaluate the association between alcohol and estrogens in both the follicular and luteal phases of the menstrual cycle, and our examination by type of alcohol consumed. The cross-sectional nature of this study limits our ability to attribute causality to the observed associations. Although women in this study did not consume high amounts of alcohol and we were unable to assess how very high alcohol consumption affects sex steroid concentrations, we observed significant associations even among women with lower levels of alcohol consumption. While alcohol was self-reported, this assessment has been validated against dietary records, with Spearman correlation coefficients of 0.9(67). Although we only had one or two (for timed samples) hormone measures per participant to capture the association with habitual alcohol consumption, one androgen measure is reproducible in our population of premenopausal women over two to three years (intra-class correlations (ICC)0.58-0.94). Although ICCs for estrogens were lower (0.38-0.69) (48), we still observed statistically significant associations.Drinking patterns were not assessed in our study, so we were unable to examine whether plasma hormone levels differ between binge drinkers and those with moderate drinking patterns.Unmeasured confounding is always a possibility; however, we were able to adjust our models for many potential confounders.
In this large study of premenopausal women, we observed higher luteal estrogen and SHBG concentrations and lower levels of free testosterone among women who consumed alcohol compared with non-drinkers. We did not observe significant associations between alcohol consumption and plasma androgen levels, nor estrone or estradiol measured in the follicular phase. While the observed associations were most consistent for wine consumption, specific types of alcohol should be explored further in future studies. Differences in premenopausal estrogen levels may contribute to the well-confirmed positive association between alcohol intake and breast cancer risk.
Supplementary Material
Acknowledgments
This research was supported from the NIH UM1 CA176726 (Walter C. Willett) and R01 CA67262 (Susan E. Hankinson).KAHirko is supported by the R25T CA098566 training grant.
Footnotes
The authors declare that they have no conflicts of interest.
References
- 1.Bagnardi V, Blangiardo M, La Vecchia C, Corrao G. A meta-analysis of alcohol drinking and cancer risk. Br J Cancer. 2001;85(11):1700–5. doi: 10.1054/bjoc.2001.2140. [DOI] [PMC free article] [PubMed] [Google Scholar]
- 2.Cho E, Lee JE, Rimm EB, Fuchs CS, Giovannucci EL. Alcohol consumption and the risk of colon cancer by family history of colorectal cancer. Am J Clin Nutr. 2012;95(2):413–9. doi: 10.3945/ajcn.111.022145. [DOI] [PMC free article] [PubMed] [Google Scholar]
- 3.Hamajima N, Hirose K, Tajima K, Rohan T, Calle EE, Heath CW, Jr, et al. Alcohol, tobacco and breast cancer--collaborative reanalysis of individual data from 53 epidemiological studies, including 58,515 women with breast cancer and 95,067 women without the disease. Br J Cancer. 2002;87(11):1234–45. doi: 10.1038/sj.bjc.6600596. [DOI] [PMC free article] [PubMed] [Google Scholar]
- 4.Smith-Warner SA, Spiegelman D, Yaun SS, van den Brandt PA, Folsom AR, Goldbohm RA, et al. Alcohol and breast cancer in women: a pooled analysis of cohort studies. JAMA. 1998;279(7):535–40. doi: 10.1001/jama.279.7.535. [DOI] [PubMed] [Google Scholar]
- 5.Kushi LH, Byers T, Doyle C, Bandera EV, McCullough M, McTiernan A, et al. American Cancer Society Guidelines on Nutrition and Physical Activity for cancer prevention: reducing the risk of cancer with healthy food choices and physical activity. CA Cancer J Clin. 2006;56(5):254–81. doi: 10.3322/canjclin.56.5.254. quiz 313-4. [DOI] [PubMed] [Google Scholar]
- 6.Key J, Hodgson S, Omar RZ, Jensen TK, Thompson SG, Boobis AR, et al. Meta-analysis of studies of alcohol and breast cancer with consideration of the methodological issues. Cancer Causes Control. 2006;17(6):759–70. doi: 10.1007/s10552-006-0011-0. [DOI] [PubMed] [Google Scholar]
- 7.Kotsopoulos J, Chen WY, Gates MA, Tworoger SS, Hankinson SE, Rosner BA. Risk factors for ductal and lobular breast cancer: results from the nurses' health study. Breast Cancer Res. 2010;12(6):R106. doi: 10.1186/bcr2790. [DOI] [PMC free article] [PubMed] [Google Scholar]
- 8.Allen NE, Beral V, Casabonne D, Kan SW, Reeves GK, Brown A, et al. Moderate alcohol intake and cancer incidence in women. J Natl Cancer Inst. 2009;101(5):296–305. doi: 10.1093/jnci/djn514. [DOI] [PubMed] [Google Scholar]
- 9.Key T, Appleby P, Barnes I, Reeves G. Endogenous sex hormones and breast cancer in postmenopausal women: reanalysis of nine prospective studies. J Natl Cancer Inst. 2002;94(8):606–16. doi: 10.1093/jnci/94.8.606. [DOI] [PubMed] [Google Scholar]
- 10.Missmer SA, Eliassen AH, Barbieri RL, Hankinson SE. Endogenous estrogen, androgen, and progesterone concentrations and breast cancer risk among postmenopausal women. J Natl Cancer Inst. 2004;96(24):1856–65. doi: 10.1093/jnci/djh336. [DOI] [PubMed] [Google Scholar]
- 11.Kaaks R, Rinaldi S, Key TJ, Berrino F, Peeters PH, Biessy C, et al. Postmenopausal serum androgens, oestrogens and breast cancer risk: the European prospective investigation into cancer and nutrition. Endocr Relat Cancer. 2005;12(4):1071–82. doi: 10.1677/erc.1.01038. [DOI] [PubMed] [Google Scholar]
- 12.Zeleniuch-Jacquotte A, Shore RE, Koenig KL, Akhmedkhanov A, Afanasyeva Y, Kato I, et al. Postmenopausal levels of oestrogen, androgen, and SHBG and breast cancer: long-term results of a prospective study. Br J Cancer. 2004;90(1):153–9. doi: 10.1038/sj.bjc.6601517. [DOI] [PMC free article] [PubMed] [Google Scholar]
- 13.James RE, Lukanova A, Dossus L, Becker S, Rinaldi S, Tjonneland A, et al. Postmenopausal serum sex steroids and risk of hormone receptor-positive and -negative breast cancer: a nested case-control study. Cancer Prev Res (Phila) 2011;4(10):1626–35. doi: 10.1158/1940-6207.CAPR-11-0090. [DOI] [PubMed] [Google Scholar]
- 14.Sieri S, Krogh V, Bolelli G, Abagnato CA, Grioni S, Pala V, et al. Sex hormone levels, breast cancer risk, and cancer receptor status in postmenopausal women: the ORDET cohort. Cancer Epidemiol Biomarkers Prev. 2009;18(1):169–76. doi: 10.1158/1055-9965.EPI-08-0808. [DOI] [PubMed] [Google Scholar]
- 15.Zhang X, Tworoger SS, Eliassen AH, Hankinson SE. Postmenopausal plasma sex hormone levels and breast cancer risk over 20 years of follow-up. Breast Cancer Res Treat. 2013;137(3):883–92. doi: 10.1007/s10549-012-2391-z. [DOI] [PMC free article] [PubMed] [Google Scholar]
- 16.Farhat GN, Cummings SR, Chlebowski RT, Parimi N, Cauley JA, Rohan TE, et al. Sex hormone levels and risks of estrogen receptor-negative and estrogen receptor-positive breast cancers. J Natl Cancer Inst. 2011;103(7):562–70. doi: 10.1093/jnci/djr031. [DOI] [PMC free article] [PubMed] [Google Scholar]
- 17.Eliassen AH, Missmer SA, Tworoger SS, Spiegelman D, Barbieri RL, Dowsett M, et al. Endogenous steroid hormone concentrations and risk of breast cancer among premenopausal women. J Natl Cancer Inst. 2006;98(19):1406–15. doi: 10.1093/jnci/djj376. [DOI] [PubMed] [Google Scholar]
- 18.Fortner RT, Eliassen AH, Spiegelman D, Willett WC, Barbieri RL, Hankinson SE. Premenopausal endogenous steroid hormones and breast cancer risk: results from the Nurses' Health Study II. Breast Cancer Res. 2013;15(2):R19. doi: 10.1186/bcr3394. [DOI] [PMC free article] [PubMed] [Google Scholar]
- 19.Kaaks R, Berrino F, Key T, Rinaldi S, Dossus L, Biessy C, et al. Serum sex steroids in premenopausal women and breast cancer risk within the European Prospective Investigation into Cancer and Nutrition (EPIC) J Natl Cancer Inst. 2005;97(10):755–65. doi: 10.1093/jnci/dji132. [DOI] [PubMed] [Google Scholar]
- 20.Kabuto M, Akiba S, Stevens RG, Neriishi K, Land CE. A prospective study of estradiol and breast cancer in Japanese women. Cancer Epidemiol Biomarkers Prev. 2000;9(6):575–9. [PubMed] [Google Scholar]
- 21.Rosenberg CR, Pasternack BS, Shore RE, Koenig KL, Toniolo PG. Premenopausal estradiol levels and the risk of breast cancer: a new method of controlling for day of the menstrual cycle. Am J Epidemiol. 1994;140(6):518–25. doi: 10.1093/oxfordjournals.aje.a117278. [DOI] [PubMed] [Google Scholar]
- 22.Thomas HV, Key TJ, Allen DS, Moore JW, Dowsett M, Fentiman IS, et al. A prospective study of endogenous serum hormone concentrations and breast cancer risk in premenopausal women on the island of Guernsey. Br J Cancer. 1997;75(7):1075–9. doi: 10.1038/bjc.1997.183. [DOI] [PMC free article] [PubMed] [Google Scholar]
- 23.Wysowski DK, Comstock GW, Helsing KJ, Lau HL. Sex hormone levels in serum in relation to the development of breast cancer. Am J Epidemiol. 1987;125(5):791–9. doi: 10.1093/oxfordjournals.aje.a114596. [DOI] [PubMed] [Google Scholar]
- 24.Micheli A, Muti P, Secreto G, Krogh V, Meneghini E, Venturelli E, et al. Endogenous sex hormones and subsequent breast cancer in premenopausal women. Int J Cancer. 2004;112(2):312–8. doi: 10.1002/ijc.20403. [DOI] [PubMed] [Google Scholar]
- 25.Kaaks R, Tikk K, Sookthai D, Schock H, Johnson T, Tjonneland A, et al. Premenopausal serum sex hormone levels in relation to breast cancer risk, overall and by hormone receptor status-Results from the EPIC cohort. Int J Cancer. 2013 doi: 10.1002/ijc.28528. [DOI] [PubMed] [Google Scholar]
- 26.Cooper GS, Sandler DP, Whelan EA, Smith KR. Association of physical and behavioral characteristics with menstrual cycle patterns in women age 29-31 years. Epidemiology. 1996;7(6):624–8. doi: 10.1097/00001648-199611000-00010. [DOI] [PubMed] [Google Scholar]
- 27.Dumitrescu RG, Shields PG. The etiology of alcohol-induced breast cancer. Alcohol. 2005;35(3):213–25. doi: 10.1016/j.alcohol.2005.04.005. [DOI] [PubMed] [Google Scholar]
- 28.Hankinson SE, Willett WC, Manson JE, Hunter DJ, Colditz GA, Stampfer MJ, et al. Alcohol, height, and adiposity in relation to estrogen and prolactin levels in postmenopausal women. J Natl Cancer Inst. 1995;87(17):1297–302. doi: 10.1093/jnci/87.17.1297. [DOI] [PubMed] [Google Scholar]
- 29.Dorgan JF, Baer DJ, Albert PS, Judd JT, Brown ED, Corle DK, et al. Serum hormones and the alcohol-breast cancer association in postmenopausal women. J Natl Cancer Inst. 2001;93(9):710–5. doi: 10.1093/jnci/93.9.710. [DOI] [PubMed] [Google Scholar]
- 30.Madigan MP, Troisi R, Potischman N, Dorgan JF, Brinton LA, Hoover RN. Serum hormone levels in relation to reproductive and lifestyle factors in postmenopausal women (United States) Cancer Causes Control. 1998;9(2):199–207. doi: 10.1023/a:1008838412423. [DOI] [PubMed] [Google Scholar]
- 31.Mahabir S, Baer DJ, Johnson LL, Dorgan JF, Campbell W, Brown E, et al. The effects of moderate alcohol supplementation on estrone sulfate and DHEAS in postmenopausal women in a controlled feeding study. Nutr J. 2004;3:11. doi: 10.1186/1475-2891-3-11. [DOI] [PMC free article] [PubMed] [Google Scholar]
- 32.Gavaler JS, Love K. Detection of the relationship between moderate alcoholic beverage consumption and serum levels of estradiol in normal postmenopausal women: effects of alcohol consumption quantitation methods and sample size adequacy. J Stud Alcohol. 1992;53(4):389–94. doi: 10.15288/jsa.1992.53.389. [DOI] [PubMed] [Google Scholar]
- 33.Key TJ, Appleby PN, Reeves GK, Roddam AW, Helzlsouer KJ, Alberg AJ, et al. Circulating sex hormones and breast cancer risk factors in postmenopausal women: reanalysis of 13 studies. Br J Cancer. 2011;105(5):709–22. doi: 10.1038/bjc.2011.254. [DOI] [PMC free article] [PubMed] [Google Scholar]
- 34.Onland-Moret NC, Peeters PH, van der Schouw YT, Grobbee DE, van Gils CH. Alcohol and endogenous sex steroid levels in postmenopausal women: a cross-sectional study. J Clin Endocrinol Metab. 2005;90(3):1414–9. doi: 10.1210/jc.2004-0614. [DOI] [PubMed] [Google Scholar]
- 35.Danforth KN, Eliassen AH, Tworoger SS, Missmer SA, Barbieri RL, Rosner BA, et al. The association of plasma androgen levels with breast, ovarian and endometrial cancer risk factors among postmenopausal women. Int J Cancer. 2010;126(1):199–207. doi: 10.1002/ijc.24709. [DOI] [PMC free article] [PubMed] [Google Scholar]
- 36.Wu F, Ames R, Evans MC, France JT, Reid IR. Determinants of sex hormone-binding globulin in normal postmenopausal women. Clin Endocrinol (Oxf) 2001;54(1):81–7. doi: 10.1046/j.1365-2265.2001.01183.x. [DOI] [PubMed] [Google Scholar]
- 37.Cauley JA, Gutai JP, Kuller LH, LeDonne D, Powell JG. The epidemiology of serum sex hormones in postmenopausal women. Am J Epidemiol. 1989;129(6):1120–31. doi: 10.1093/oxfordjournals.aje.a115234. [DOI] [PubMed] [Google Scholar]
- 38.London S, Willett W, Longcope C, McKinlay S. Alcohol and other dietary factors in relation to serum hormone concentrations in women at climacteric. Am J Clin Nutr. 1991;53(1):166–71. doi: 10.1093/ajcn/53.1.166. [DOI] [PubMed] [Google Scholar]
- 39.Newcomb PA, Klein R, Klein BE, Haffner S, Mares-Perlman J, Cruickshanks KJ, et al. Association of dietary and life-style factors with sex hormones in postmenopausal women. Epidemiology. 1995;6(3):318–21. doi: 10.1097/00001648-199505000-00022. [DOI] [PubMed] [Google Scholar]
- 40.Ginsburg ES, Mello NK, Mendelson JH, Barbieri RL, Teoh SK, Rothman M, et al. Effects of alcohol ingestion on estrogens in postmenopausal women. JAMA. 1996;276(21):1747–51. doi: 10.1001/jama.1996.03540210055034. [DOI] [PubMed] [Google Scholar]
- 41.Rinaldi S, Peeters PH, Bezemer ID, Dossus L, Biessy C, Sacerdote C, et al. Relationship of alcohol intake and sex steroid concentrations in blood in pre- and post-menopausal women: the European Prospective Investigation into Cancer and Nutrition. Cancer Causes Control. 2006;17(8):1033–43. doi: 10.1007/s10552-006-0041-7. [DOI] [PubMed] [Google Scholar]
- 42.Key TJ, Appleby PN, Reeves GK, Travis RC, Alberg AJ, Barricarte A, et al. Sex hormones and risk of breast cancer in premenopausal women: a collaborative reanalysis of individual participant data from seven prospective studies. Lancet Oncol. 2013;14(10):1009–19. doi: 10.1016/S1470-2045(13)70301-2. [DOI] [PMC free article] [PubMed] [Google Scholar]
- 43.Muti P, Trevisan M, Micheli A, Krogh V, Bolelli G, Sciajno R, et al. Reliability of serum hormones in premenopausal and postmenopausal women over a one-year period. Cancer Epidemiol Biomarkers Prev. 1996;5(11):917–22. [PubMed] [Google Scholar]
- 44.Cigolini M, Targher G, Bergamo Andreis IA, Tonoli M, Filippi F, Muggeo M, et al. Moderate alcohol consumption and its relation to visceral fat and plasma androgens in healthy women. Int J Obes Relat Metab Disord. 1996;20(3):206–12. [PubMed] [Google Scholar]
- 45.Garcia-Closas M, Herbstman J, Schiffman M, Glass A, Dorgan JF. Relationship between serum hormone concentrations, reproductive history, alcohol consumption and genetic polymorphisms in pre-menopausal women. Int J Cancer. 2002;102(2):172–8. doi: 10.1002/ijc.10651. [DOI] [PubMed] [Google Scholar]
- 46.Dorgan JF, Reichman ME, Judd JT, Brown C, Longcope C, Schatzkin A, et al. The relation of reported alcohol ingestion to plasma levels of estrogens and androgens in premenopausal women (Maryland, United States) Cancer Causes Control. 1994;5(1):53–60. doi: 10.1007/BF01830726. [DOI] [PubMed] [Google Scholar]
- 47.Maskarinec G, Morimoto Y, Takata Y, Murphy SP, Stanczyk FZ. Alcohol and dietary fibre intakes affect circulating sex hormones among premenopausal women. Public Health Nutr. 2006;9(7):875–81. doi: 10.1017/phn2005923. [DOI] [PubMed] [Google Scholar]
- 48.Missmer SA, Spiegelman D, Bertone-Johnson ER, Barbieri RL, Pollak MN, Hankinson SE. Reproducibility of plasma steroid hormones, prolactin, and insulin-like growth factor levels among premenopausal women over a 2- to 3-year period. Cancer Epidemiol Biomarkers Prev. 2006;15(5):972–8. doi: 10.1158/1055-9965.EPI-05-0848. [DOI] [PubMed] [Google Scholar]
- 49.Eliassen AH, Chen WY, Spiegelman D, Willett WC, Hunter DJ, Hankinson SE. Use of aspirin, other nonsteroidal anti-inflammatory drugs, and acetaminophen and risk of breast cancer among premenopausal women in the Nurses' Health Study II. Arch Intern Med. 2009;169(2):115–21. doi: 10.1001/archinternmed.2008.537. discussion 121. [DOI] [PMC free article] [PubMed] [Google Scholar]
- 50.Tworoger SS, Lee IM, Buring JE, Hankinson SE. Plasma androgen concentrations and risk of incident ovarian cancer. Am J Epidemiol. 2008;167(2):211–8. doi: 10.1093/aje/kwm278. [DOI] [PubMed] [Google Scholar]
- 51.Karlson EW, Chibnik LB, McGrath M, Chang SC, Keenan BT, Costenbader KH, et al. A prospective study of androgen levels, hormone-related genes and risk of rheumatoid arthritis. Arthritis Res Ther. 2009;11(3):R97. doi: 10.1186/ar2742. [DOI] [PMC free article] [PubMed] [Google Scholar]
- 52.Hankinson SE, Willett WC, Manson JE, Colditz GA, Hunter DJ, Spiegelman D, et al. Plasma sex steroid hormone levels and risk of breast cancer in postmenopausal women. J Natl Cancer Inst. 1998;90(17):1292–9. doi: 10.1093/jnci/90.17.1292. [DOI] [PubMed] [Google Scholar]
- 53.Fujimoto VY, Clifton DK, Cohen NL, Soules MR. Variability of serum prolactin and progesterone levels in normal women: the relevance of single hormone measurements in the clinical setting. Obstet Gynecol. 1990;76(1):71–8. [PubMed] [Google Scholar]
- 54.Rosner B. Percentage points for a generalized ESD many-outlier procedure. Technometrics. 1983;25:165–172. [Google Scholar]
- 55.Rosner B, Cook N, Portman R, Daniels S, Falkner B. Determination of blood pressure percentiles in normal-weight children: some methodological issues. Am J Epidemiol. 2008;167(6):653–66. doi: 10.1093/aje/kwm348. [DOI] [PubMed] [Google Scholar]
- 56.Rice MS, Tworoger SS, Rosner BA, Pollak MN, Hankinson SE, Tamimi RM. Insulin-like growth factor-1, insulin-like growth factor-binding protein-3, growth hormone, and mammographic density in the Nurses' Health Studies. Breast Cancer Res Treat. 2012;136(3):805–12. doi: 10.1007/s10549-012-2303-2. [DOI] [PMC free article] [PubMed] [Google Scholar]
- 57.Smith-Warner SA, Spiegelman D, Ritz J, Albanes D, Beeson WL, Bernstein L, et al. Methods for pooling results of epidemiologic studies: the Pooling Project of Prospective Studies of Diet and Cancer. Am J Epidemiol. 2006;163(11):1053–64. doi: 10.1093/aje/kwj127. [DOI] [PubMed] [Google Scholar]
- 58.Reichman ME, Judd JT, Longcope C, Schatzkin A, Clevidence BA, Nair PP, et al. Effects of alcohol consumption on plasma and urinary hormone concentrations in premenopausal women. J Natl Cancer Inst. 1993;85(9):722–7. doi: 10.1093/jnci/85.9.722. [DOI] [PubMed] [Google Scholar]
- 59.Strauss JF, BR . Reproductive Endocrinology. 5th. Philadelphia: Elsevier Saunders; 2004. [Google Scholar]
- 60.Siiteri PK, M P. The role of extraglandular estrogen in human endocrinology. New York: The American Physiological Society; 1973. [Google Scholar]
- 61.Siiteri PK. Extraglandular oestrogen formation and serum binding of oestradiol: relationship to cancer. J Endocrinol. 1981;89(Suppl):119P–129P. [PubMed] [Google Scholar]
- 62.Kroenke CH, Chu NF, Rifai N, Spiegelman D, Hankinson SE, Manson JE, et al. A cross-sectional study of alcohol consumption patterns and biologic markers of glycemic control among 459 women. Diabetes Care. 2003;26(7):1971–8. doi: 10.2337/diacare.26.7.1971. [DOI] [PubMed] [Google Scholar]
- 63.Bezemer ID, Rinaldi S, Dossus L, Gils CH, Peeters PH, Noord PA, et al. C-peptide, IGF-I, sexsteroid hormones and adiposity: a cross-sectional study in healthy women within the European Prospective Investigation into Cancer and Nutrition (EPIC) Cancer Causes Control. 2005;16(5):561–72. doi: 10.1007/s10552-004-7472-9. [DOI] [PubMed] [Google Scholar]
- 64.Pasquali R, Vicennati V, Bertazzo D, Casimirri F, Pascal G, Tortelli O, et al. Determinants of sex hormone-binding globulin blood concentrations in premenopausal and postmenopausal women with different estrogen status. Virgilio-Menopause-Health Group Metabolism. 1997;46(1):5–9. doi: 10.1016/s0026-0495(97)90159-1. [DOI] [PubMed] [Google Scholar]
- 65.Verkasalo PK, Thomas HV, Appleby PN, Davey GK, Key TJ. Circulating levels of sex hormones and their relation to risk factors for breast cancer: a cross-sectional study in 1092 pre- and postmenopausal women (United Kingdom) Cancer Causes Control. 2001;12(1):47–59. doi: 10.1023/a:1008929714862. [DOI] [PubMed] [Google Scholar]
- 66.Tsuji M, Tamai Y, Wada K, Nakamura K, Hayashi M, Takeda N, et al. Associations of intakes of fat, dietary fiber, soy isoflavones, and alcohol with levels of sex hormones and prolactin in premenopausal Japanese women. Cancer Causes Control. 2012;23(5):683–9. doi: 10.1007/s10552-012-9935-8. [DOI] [PubMed] [Google Scholar]
- 67.Giovannucci E, Colditz G, Stampfer MJ, Rimm EB, Litin L, Sampson L, et al. The assessment of alcohol consumption by a simple self-administered questionnaire. Am J Epidemiol. 1991;133(8):810–7. doi: 10.1093/oxfordjournals.aje.a115960. [DOI] [PubMed] [Google Scholar]
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