Identifying geographic disparities in the early detection of breast cancer using a geographic information system

INTRODUCTION

Identifying communities with lower rates of mammography screening is a critical step to providing targeted screening programs; however, population-based data necessary for identifying these geographic areas are limited. This study presents methods to identify geographic disparities in the early detection of breast cancer.

METHODS

Data for all women residing in Dane County, Wisconsin, at the time of their breast cancer diagnosis from 1981 through 2000 (N = 4769) were obtained from the Wisconsin Cancer Reporting System (Wisconsin's tumor registry) by ZIP code of residence. Hierarchical logistic regression models for disease mapping were used to identify geographic differences in the early detection of breast cancer.

RESULTS

The percentage of breast cancer cases diagnosed in situ (excluding lobular carcinoma in situ) increased from 1.3% in 1981 to 11.9% in 2000. This increase, reflecting increasing mammography use, occurred sooner in Dane County than in Wisconsin as a whole. From 1981 through 1985, the proportion of breast cancer diagnosed in situ in Dane county was universally low (2%-3%). From 1986 through 1990, urban and suburban ZIP codes had significantly higher rates (10%) compared with rural ZIP codes (5%). From 1991 through 1995, mammography screening had increased in rural ZIP codes (7% of breast cancer diagnosed in situ). From 1996 through 2000, mammography use was fairly homogeneous across the entire county (13%-14% of breast cancer diagnosed in situ).

CONCLUSION

The percentage of breast cancer cases diagnosed in situ increased in the state and in all areas of Dane County from 1981 through 2000. Visual display of the geographic differences in the early detection of breast cancer demonstrates the diffusion of mammography use across the county over the 20-year period.

The increasing incidence of end-stage renal disease in Wisconsin from 1982-2003: an analysis by age, race, and primary diagnosis

PURPOSE

To examine the trends in the incidence of end-stage renal disease in Wisconsin from 1982 to 2003.

METHODS

De-identified incidence data for this study were supplied by the Renal Network of the Upper Midwest (Region 11). We examined trends in the incidence of end-stage renal disease by age, race, gender, and primary diagnosis from 1982 to 2003.

RESULTS

The incidence of end-stage renal disease increased more than 3-fold from 1982 to 2003. This increase was especially striking in persons with diabetes and hypertension, as well as among those aged > or = 75 years. The increase in the incidence of end-stage renal disease was also apparent among all racial groups and both genders.

CONCLUSIONS

The continued increase in the incidence of end-stage renal disease in Wisconsin may result from a number of factors, such as an unintended consequence of better chronic disease management, which may predispose older individuals to end-stage renal disease. Resources aimed at decreasing the incidence of end-stage renal disease are needed to prevent unnecessary health care costs and negative health outcomes, including loss of life.

Trends in total knee replacement surgeries and implications for public health, 1990-2000

OBJECTIVES

Total joint replacements are important surgical interventions for treating severe arthritis of weight-bearing joints. The most common indication for total knee replacement (TKR) is osteoarthritis of the knee joint. The goals of this study were to assess the trend in rate of TKR in Wisconsin and to describe the economic impact of these surgical procedures on the health care system.

METHOD

A population-based cross-sectional study of TKR surgeries was conducted among Wisconsin residents aged > or = 45 years. The Wisconsin inpatient hospital discharge data from 1990 through 2000 were used. Rates were age-adjusted to the 2000 U.S. population, and charges for TKR were adjusted for inflation.

RESULTS

From 1990 through 2000, the age-adjusted rate for TKR increased by 81.5% (from 162 to 294 per 100,000; p<0.001). The rate increased the most among the youngest age group (45-49 years), rate ratio 5.1 for men, 4.2 for women. The total charges for TKR increased from 69.4 million dollars to 148 million dollars (109.2% inflation-adjusted increase). Medicare received the highest proportion of charges for TKR procedures, but throughout the study period, the proportion of charges covered by private insurance increased by 39%.

CONCLUSIONS

The rate and costs of TKR procedures among Wisconsin residents increased substantially from 1990 through 2000, especially among younger age groups. Changes in medical practices probably accounted for some of this increase, but these trends also may reflect an increased prevalence of osteoarthritis, which in turn may be related to dramatic increases in the number of individuals who are overweight.

Correlates of age at menarche among sixth grade students in Wisconsin

We conducted a cross-sectional, school-based survey of sixth-grade girls living in the Reedsburg, Wis area school district to explore factors associated with age at menarche. Data collection included parent and student questionnaires for demographic, menstrual, physical activity, and nutritional information. School nurses conducted physical examinations to provide anthropometric measurements. Salivary samples were obtained for laboratory analysis of estradiol, estrone, estriol, and progesterone levels. Students (n=59) were an average of 11.9 years of age (range: 10-13). Nineteen students (32%) reported menarche, with an average of 11.4 years of age (range: 8-12). Cycle length of the menstruating students averaged 32.0 days (range: 25-46 days). Students' age at menarche was positively correlated with their mothers' age at menarche (r=0.53, P=0.02). Total caloric intake, macronutrients, hormone levels, birthweight, and family size were not associated with menstrual status. We observed an inverse association between increasing weight and earlier age at menarche (P=0.03). Students past menarche watched more television (P=0.03) and participated in fewer hours of sporting activity (P=0.08) than students who had not yet reached menarche. These preliminary data suggest that further investigation of the determinants of menarche is both feasible and warranted.

Youth suicide in Wisconsin: mortality, hospitalizations, and risk factors

OBJECTIVE

To review Wisconsin data on youth suicide mortality, hospitalizations from nonfatal self-inflicted injuries, and self-reported risk behaviors.

METHODS

Suicide mortality data for youth (defined here as persons 10-24 years of age) were obtained from the Centers for Disease Control and Prevention (CDC) for 1995-2001 and from the Wisconsin Division of Public Health for 2002. Hospitalization data for Wisconsin from 1995-2002 were obtained from the Wisconsin Division of Public Health. Survey data on self-reported risk behaviors were obtained from the CDC for 2001.

RESULTS

While the rate of youth suicide declined by 24% in the United States during the 9-year period studied, Wisconsin's rate declined only slightly (8%). Firearms accounted for 60% of completed youth suicides in Wisconsin. Medication overdoses and cutting accounted for 88% of self-inflicted injury hospitalizations for Wisconsin youth from 1995 to 2002. Wisconsin high school students reported similar rates of risk factor behaviors as youth in New Jersey (the state with the lowest suicide rates in the nation), but were more likely to use firearms (60% versus 32%).

CONCLUSION

Rates of suicide mortality, attempts, and self-reported risk behaviors among youth in Wisconsin continue to be unacceptably high. Physicians can play an important role in reducing youth suicide rates by acting within their clinical practices, as leaders in community suicide-prevention activities, and as advocates for policy change.

Births to teens in Wisconsin: targeting high-risk populations

BACKGROUND

Adolescents giving birth represents an important public health issue with social, economic, and health-related consequences.

OBJECTIVE

Compare birth rates and trends in birth rates among adolescents age 15-19 years in Wisconsin and the United States by race/ethnicity.

METHODS

Teen birth rates from 1998-2002, and trends in birth rates from 1995-2002 for Wisconsin and the United States were compared by race/ethnicity using data from the Wisconsin Interactive Statistics on Health and data from the Centers for Disease Control and Prevention.

RESULTS

The general statewide birth rates and birth rates for Wisconsin white teens were lower than national rates, while birth rates for black, Hispanic, and American Indian teens were well above national rates from 1998-2002. Disparities between births to minority adolescents and white adolescents were higher in Wisconsin than in the United States. Although teen birth rates in general have declined nationally and in Wisconsin, rates among Hispanics in Wisconsin have increased during the 1995-2002 period.

DISCUSSION

Racial disparities in teen birth rates in Wisconsin far exceed national disparities. These disparities result from far-ranging, long-term social and environmental differences in underlying determinants of health that relate to ethnic and cultural beliefs, variation in access to health care that provides family planning and reproductive health services, decreased availability of school-based clinics, lack of role models, education, and variations in income and social status. Wisconsin should focus its teen pregnancy prevention activities on the groups at highest risk.

Using local data to monitor obesity rates in Wisconsin counties, 1994-2003

INTRODUCTION

Although county-level obesity estimates are necessary for planning and evaluating community-based interventions, the quality of these data has never been examined.

OBJECTIVES

To evaluate the reliability of the county-level obesity prevalence estimates from Wisconsin's 72 counties and to highlight the variation of obesity among Wisconsin counties.

METHODS

Obesity prevalence data for each county in Wisconsin were obtained from the Wisconsin Behavioral Risk Factor Surveys (BRFS) from 1994 to 2003. During this 10-year period, 26,635 residents were interviewed by telephone, with sample sizes ranging from 6586 in Milwaukee County to 15 in Menominee County. The number of counties with reportable and reliable estimates, using criteria of sample sizes > or = 50 and > or = 300, respectively, was determined.

RESULTS

The 10-year obesity prevalence was reportable for 68 of Wisconsin's 72 counties, ranging from 9.7% in Bayfield County to 29% in Langlade County. By pooling data from the BRFS for 5-, 3-, and 1-year periods, estimates are reportable for 43, 24, and 4 counties, respectively. A sample size of at least 300 provides a more reliable estimate, but is available for only 5 counties for a 5-year period.

CONCLUSIONS

By pooling 10 years of survey data, obesity rates can be estimated for most of Wisconsin's 72 counties, demonstrating marked variation in rates across the state. This surveillance system provides valuable data for larger counties for planning and program evaluation. Supplemental surveys can be conducted to provide more reliable and timely estimates.

Competitive food initiatives in schools and overweight in children: a review of the evidence

BACKGROUND

Recent research has shown significant increases in the rates of obesity in US adults and children. Despite the widespread discussion about childhood overweight, relatively little discussion focuses on solutions.

METHODS

We reviewed the literature on school programs and policies that address competitive foods-commonly called "junk" foods. These foods tend to be high in sugar or fat and provide minimal nutritive value.

RESULTS

Sugar-sweetened beverages such as sodas contribute to weight gain and poor nutrition among students-the average student consumes 31 pounds of sugar in these drinks annually. The sale of competitive foods in schools often competes with the more nutritious school lunch programs. With minimal federal and state policies addressing the sale of competitive foods, individual school districts in Wisconsin and elsewhere have explored various alternatives to improve school nutrition. The evidence suggests that these policies can be effective and at the same time increase food sale revenue.

CONCLUSION

Communities may be able to improve childhood nutrition through school-based nutrition programs and policies that address the sale of competitive foods.

Evaluation of community and organizational characteristics of smoke-free ordinance campaigns in 15 Wisconsin cities

INTRODUCTION

Smoke-free restaurant ordinance campaigns were conducted in 15 Wisconsin cities during 1992 through 2002. Community and health coalition organizational characteristics varied with each campaign; nine campaigns were successful in enacting ordinances, and six campaigns failed.

METHODS

Data on community and coalition characteristics were analyzed. Community characteristics included adjusted gross income, percentage of Democratic voters in recent elections, and county smoking prevalence. Coalition characteristics included the number of supporters identified, leadership experience, level of print news media coverage, and editorial position of local newspaper.

RESULTS

Successful campaigns were more likely to have leadership with high levels of political experience; eight of nine successful campaigns had leadership with high levels of experience, and two of six unsuccessful campaigns had leadership with high levels of experience. Every successful campaign had high levels of newspaper coverage and strong editorial support. None of the unsuccessful campaigns had high levels of news coverage or strong editorial support.

CONCLUSION

Characteristics controlled or influenced by coalitions are associated with successful outcomes. Community characteristics were not associated with outcomes. These results should assist communities planning to implement smoke-free ordinances or other health policy campaigns.

A statewide collaboration to monitor diabetes quality improvement among Wisconsin health plans

OBJECTIVE

The Wisconsin Collaborative Diabetes Quality Improvement Project was initiated in 1999 by the Wisconsin Department of Health and Family Services, Diabetes Prevention and Control Program to monitor quality of diabetes care among the state's health plans.

STUDY DESIGN

Prospective observational.

METHODS

Annual invitations were mailed to all Wisconsin managed care plans to participate in the project. Collaborators submitted Comprehensive Diabetes Care Health Plan Employer Data and Information Set (HEDIS) measures, as well as other selected HEDIS measures. Data were summarized and reported anonymously back to the collaborators at quarterly forums and in annual reports.

RESULTS

Five of the 6 Comprehensive Diabetes Care HEDIS measures have improved significantly in Wisconsin since 1999. Despite this improvement, measure variation across health plans remains high. Collaborators have continued to share resources and best practices at quarterly forums and through statewide initiatives.

CONCLUSIONS

This project is an example of an ongoing statewide collaborative quality improvement effort among otherwise competing health plans. Collaboration at regular forums, sharing of HEDIS data to assess quality of diabetes care in health plans, and sharing of resources and best practices may have contributed to improvements in the quality of diabetes care in Wisconsin.

Socioeconomic risk factors for breast cancer: distinguishing individual- and community-level effects

BACKGROUND

Women are at higher risk of breast cancer if they have higher socioeconomic status (SES) or live in higher SES or urban communities. We examined whether women living in such communities remained at greater risk of breast cancer after controlling for individual education and other known individual-level risk factors.

METHODS

Data were from a population-based, breast cancer case-control study conducted in Wisconsin from 1988 to 1995 (n = 14,667). Data on community SES and urbanicity come from the 1990 census, measured at the census tract and zip code levels. We evaluated relationships between individual- and community-level variables and breast cancer risk using multilevel logistic regression models with random community intercepts.

RESULTS

After controlling for individual education and other individual-level risk factors (age, mammography use, family history of breast cancer, parity, age at first birth, alcohol intake, body mass index, hormone replacement use, oral contraceptive use, and menopausal status), women living in the highest SES communities had greater odds of having breast cancer than women living in the lowest SES communities (1.20; 95% confidence interval = 1.05-1.37). Similarly, the odds were greater for women in urban versus rural communities (1.17; 1.06-1.28).

CONCLUSIONS

Community SES and urbanicity are apparently not simply proxies for individual SES. Future research should examine why living in such communities itself is associated with greater risk of breast cancer.

Potential exposure to PCBs, DDT, and PBDEs from sport-caught fish consumption in relation to breast cancer risk in Wisconsin

In Wisconsin, consumption of Great Lakes fish is an important source of exposure to polychlorinated biphenyls (PCBs), dichlorodiphenyltrichloroethane (DDT), polybrominated diphenyl ethers (PBDEs), and other halogenated hydrocarbons, all of which may act as potential risk factors for breast cancer. We examined the association between sport-caught fish consumption and breast cancer incidence as part of an ongoing population-based case-control study. We identified breast cancer cases 20-69 years of age who were diagnosed in 1998-2000 (n = 1,481) from the Wisconsin Cancer Reporting System. Female controls of similar age were randomly selected from population lists (n = 1,301). Information about all sport-caught (Great Lakes and other lakes) fish consumption and breast cancer risk factors was obtained through telephone interviews. After adjustment for known and suspected risk factors, the relative risk of breast cancer for women who had recently consumed sport-caught fish was similar to women who had never eaten sport-caught fish [relative risk (RR) = 1.00; 95% confidence interval (CI), 0.86-1.17]. Frequency of consumption and location of sport-caught fish were not associated with an increased risk of breast cancer. Recent consumption of Great Lakes fish was not associated with postmenopausal breast cancer (RR = 0.78; 95% CI, 0.57-1.07), whereas risk associated with premenopausal breast cancer was elevated (RR = 1.70; 95% CI, 1.16-2.50). In this study we found no overall association between recent consumption of sport-caught fish and breast cancer, although there may be an increased breast cancer risk for subgroups of women who are young and/or premenopausal.

Trends in bariatric surgery for morbid obesity in Wisconsin

BACKGROUND

Obesity is a national epidemic with rates in Wisconsin and the United States doubling over the past decade. Research of available treatments for morbid obesity (body mass index > or = 40 kg/m2) suggests that bariatric surgery may be the only modality that provides any significant long term weight loss.

METHODS

Using the data from Centers for Disease Control and Prevention's Behavioral Risk Factor Surveillance System, we analyzed self-reported information on body weight and height among adults in Wisconsin. We used the WITHIN database for inpatient hospitalization and surgeries in Wisconsin to evaluate trends in gastric bypass surgery. Finally, we surveyed bariatric surgeons in Wisconsin to assess trends in bariatric surgery in the state.

RESULTS

In Wisconsin, the percentage of the adults considered to be obese increased from 11% in 1990 to 22% in 2001. In 1999-2001, approximately 80,000 adults (2% of the population) were morbidly obese. The number of gastric bypass surgeries performed in Wisconsin more than doubled in 1 year, from 182 in 2001 to 426 in 2002. According to bariatric surgeons, gastric bypass accounts for approximately 90% of bariatric surgeries performed in Wisconsin. Thus, in 2002, there was roughly 1 bariatric surgery for every 200 morbidly obese Wisconsin adults. Most (84%) bariatric surgeons are planning to increase the number of procedures they perform, and 24% plan on adding an additional bariatric surgeon to their group.

SUMMARY

Bariatric surgery rates are increasing in Wisconsin, yet the demand for surgery far exceeds current capacity of surgeons in the state.

Community trends in the early detection of breast cancer in Wisconsin, 1980-1998

BACKGROUND

Early detection of breast cancer is an important public health goal. Rates of early detection have increased over the past several decades, contributing to recent declines in mortality. Despite these overall trends, however, some populations have experienced less progress than others.

METHODS

The rates of early detection, measured as the percentage of breast cancers diagnosed as breast carcinoma in situ, were calculated using data from Wisconsin's population-based tumor registry from 1980 to 1998. Trends in breast cancer (percent diagnosed in situ) were examined over time by socioeconomic characteristics of ZIP code of residence, using census data.

RESULTS

The percentage of breast cancer cases that were breast carcinoma in situ was more than five times greater in the later period (1994-1998) (13.9%), compared with the early period (1980-1984) (2.6%). In the middle period (1987-1991), breast cancer was diagnosed as breast carcinoma in situ about one-third less frequently among women in areas with the lowest urbanization, median family income, and percent educated beyond high school, compared with communities with the highest levels of these variables. Recently disparities in early detection rates by community income and education indicators declined slightly, whereas disparities in percent of breast carcinoma in situ by urbanization did not.

CONCLUSIONS

Communities with lower levels of income, education, and urbanization lagged in the early detection of breast cancer during the 1980s and, despite some progress during the 1990s, continue to be underserved. Women in these communities should be targeted for interventions to improve the early detection of breast cancer.

Health-related quality of life in female long-term colorectal cancer survivors

Although the number of women who survive treatment for colorectal cancer is growing, little is known about the quality of life of long-term survivors. The purpose of analyses presented in this paper is to describe the overall health-related quality of life of female long-term colorectal cancer survivors and the factors that may modify their levels of quality of life. A population-based sample of 726 Wisconsin women diagnosed with colorectal cancer from 1990-1991 was recontacted. Of the 443 women alive in 1999, 307 (69%) completed a follow-up questionnaire including the Medical Outcomes Study Short-Form 36 Health Status Survey, which is comprised of 36 items that generate nine domain scale scores and two summary scores: the Physical Component Summary score and the Mental Component Summary score. The mean follow-up was 9 years (range 7-11), and the mean age at follow-up was 72 years (range 43-85). The mean Physical Component Summary score was lower for participants with greater ages, greater numbers of comorbidities, and greater body masses at the time of follow-up. The mean Mental Component Summary score also was lower for participants with greater numbers of comorbidities. Differences associated with degree of comorbidity were observed for all eight domain scales. Female long-term survivors of colorectal cancer appear to report health-related quality of life comparable with that of similarly aged women in the general population. These data suggest that, over the long term, factors attributable to aging, body weight, and chronic medical conditions play more dominant roles in determining physical and mental health than factors related to the initial colorectal cancer diagnosis.

Social networks and quality of life among female long-term colorectal cancer survivors

BACKGROUND

The population of long-term colorectal cancer survivors in the United States continues to increase, but little is known about how they fare-physically, mentally, or socially-in the years after diagnosis. The current study examines female long-term colorectal cancer survivors' health-related quality of life (HRQoL) in relation to social networks.

METHODS

A population-based sample of female colorectal cancer survivors (n = 726) residing in Wisconsin was recontacted approximately 9 years after the initial diagnosis. Of 443 women who were alive in 1999, 307 women completed a follow-up questionnaire. Analysis was conducted on 259 participants who completed the Medical Outcomes Study Short Form 36 Health Status Survey and a modified version of Berkman and Syme's Social Network Index. Using multivariate analyses, HRQoL summary scores were tested for associations with individual and composite measures of social networks, including marital/partner status; number of children, relatives, and friends; and the frequency of religious and community participation.

RESULTS

After adjusting for age, extent of disease at diagnosis, number of comorbidities, body mass, and education, HRQoL was similar to norms published for the general population. Individual social network measures (including the number of relatives and friends) and composite network measures (including network size, the number of ties seen at least once per month, and overall social connectedness) were associated positively with mental health.

CONCLUSIONS

Social networks may have an important relation with HRQoL-particularly mental health-among female long-term colorectal cancer survivors. The results of this study should be of interest to those seeking to understand or improve HRQoL among this growing population.

The role of epidemiology in chronic disease prevention and health promotion programs

Although the role for epidemiology is widely accepted in public health programs in general, its role in chronic disease programs is not as widely recognized. One possible barrier to improving epidemiologic capacity in chronic disease prevention and health promotion programs is that chronic disease program managers and public health decision makers may have a limited understanding of basic chronic disease epidemiology functions. We describe the assessment process of data collection, analysis, interpretation, and dissemination, and, using examples from two states, illustrate how this approach can be used to support program and policy development in three areas: by defining the problem, finding programs that work, and evaluating the effects of the program over time. Given the significant burden of chronic diseases in the United States, the scientific guidance provided by epidemiology is essential to help public health leaders identify priorities and intervene with evidence-based and effective prevention and control programs.

Geocoding addresses from a large population-based study: lessons learned

BACKGROUND

Geographic information systems (GIS) and spatial statistics are useful for exploring the relation between geographic location and health. The ultimate usefulness of GIS depends on both completeness and accuracy of geocoding (the process of assigning study participants' residences latitude/longitude coordinates that closely approximate their true locations, also known as address matching). The goal of this project was to develop an iterative geocoding process that would achieve a high match rate in a large population-based health study.

METHODS

Data were from a study conducted in Wisconsin using mailing addresses of participants who were interviewed by telephone from 1988 to 1995. We standardized the addresses according to US Postal Service guidelines, used desktop GIS geocoding software and two versions of the Topologically Integrated Geographic Encoding and Referencing street maps, accessed Internet mapping engines for problematic addresses, and recontacted a small number of study participants' households. We also tabulated the project's cost, time commitment, software requirements, and brief notes for each step and their alternatives.

RESULTS

Of the 14,804 participants, 97% were ultimately assigned latitude/longitude coordinates corresponding to their respective residences. The remaining 3% were geocoded to their zip code centroid.

CONCLUSION

The multiple methods described in this work provide practical information for investigators who are considering the use of GIS in their population health research.

Evaluation of the Centers for Disease Control and Prevention's chronic disease state-based epidemiology for public health program support (STEPPS) program

To identify effective strategies for improving epidemiology capacity in state chronic disease programs, staff epidemiologists and program directors from 25 states were interviewed using a structured questionnaire by phone or in person. Respondents reported three chief barriers to chronic disease epidemiology capacity: lack of institutional commitment and support for chronic disease epidemiology; lack of professional opportunities to engage with peers, colleagues, and scientists; and lack of trained epidemiology staff and resources to support chronic disease functions and activities. Epidemiology capacity in states would be improved by expanding the role and scope of staff placement programs; assisting states in establishing formal collaborations with academic institutions; and providing technical assistance to staff currently employed in states through training, consultation, and networking.

A method to guide community planning and evaluation efforts in tobacco control using data on smoking during pregnancy

BACKGROUND

Effective community based tobacco control programmes are critical for state and nationwide impact. However, there is little discussion in the literature of methods for setting local objectives which use locally collected data and account for historical variation in progress.

OBJECTIVES

To develop and illustrate a method that uses locally available birth certificate data to model trends in tobacco use during pregnancy among women giving birth, predict future prevalence, and use predictions to set community specific tobacco control objectives.

DATA SOURCE

Vital statistics. Wisconsin standard birth certificates, 1990-2000, which record the smoking status of the mother during pregnancy.

DATA ANALYSIS

Trends in the prevalence of smoking during pregnancy in Wisconsin statewide and in all counties (n = 72) were modelled using linear regression of log prevalence on year. Model fit was assessed using R(2). Regression slopes, indicating estimated relative annual percentage change in prevalence, were used to predict prevalence in 2005, and objectives were calculated as a 20% reduction from the predicted prevalence in 2005.

CONCLUSIONS

Modelling trends in the prevalence of smoking using locally collected data enables communities to set reasonable future tobacco control objectives that account for historical trends in progress.

Endometrial cancer incidence in relation to electric blanket use

Endometrial cancer is associated with endogenous and exogenous estrogen excess. Some investigators have posited that electromagnetic fields may influence cancer risk through estrogenic hormonal mechanisms; however, there have been no studies reporting on electric blanket exposure in relation to endometrial cancer. The authors examined this possible association between endometrial cancer risk and electric blanket or mattress cover use as part of a population-based, case-control study. This analysis included incident endometrial cancer cases 40-79 years of age, interviewed during 1994 (n = 148; response rate, 87%) and identified from the Wisconsin tumor registry. Female controls of similar age were randomly selected from population lists (n = 659; response rate, 85%). Information regarding electric blanket and mattress cover use and endometrial cancer risk factors was obtained through structured telephone interviews approximately 1 year after diagnosis. After adjustment for age, body mass index, and postmenopausal hormone use, the risk of endometrial cancer was similar among ever users (odds ratio = 1.04, 95% confidence interval: 0.70, 1.55) and among current users (odds ratio = 0.87, 95% confidence interval: 0.49, 1.54) as compared with never users. Despite its small size and potential misclassification of exposure, this study provides evidence against an association between electric blanket or mattress cover use and endometrial cancer.

Prevalence and treatment of menopausal symptoms among breast cancer survivors

Women diagnosed with breast cancer often experience early menopause secondary to treatment effects, yet physicians may be reluctant to prescribe hormone replacement therapy (HRT) because of the potential increased risk of recurrence. To assess the burden of menopausal symptoms, HRT use, and alternative treatments in recent breast cancer survivors, a population-based, case-control study was conducted among breast cancer survivors and age-matched controls. Wisconsin women 18-69 years old with a new diagnosis of breast cancer 8-11 months prior to interview (n = 110) and control subjects randomly selected from population lists (n = 73) responded to a standardized telephone questionnaire that elicited information on menopausal symptoms, estrogen and alternative therapies (prescription medications, vitamins, herbal preparations, soy products, acupuncture, chiropractic) used to alleviate symptoms. We used multivariate logistic regression to obtain odds ratios and 95% confidence intervals (CI) for symptoms of menopause, use of estrogen, and use of alternative therapies. Breast cancer survivors were 5.3 (95% CI 2.7-10.2) times more likely to experience symptoms, 25 (95% CI 8.3-100) times less likely to use estrogen, and 7.4 (95% CI 2.5-21.9) times more likely to use alternatives than controls. Soy, vitamin E, and herbal remedies were the most common alternative therapies reported by participants; use was greater in cases compared to controls. Most soy users reported increasing soy products specifically to reduce the chances of a diagnosis of recurrent breast cancer. Among cases, tamoxifen users (n = 62) reported a higher prevalence of symptoms and a higher prevalence of alternative treatments. This is the first population-based survey of menopausal symptoms and treatments that compares breast cancer cases with disease-free controls. Cases are both more likely to experience menopausal symptoms and less likely to use HRT than controls. Instead, cases treat menopausal symptoms with vitamin E and soy products, even though the safety and efficacy of these therapies are unproven. The increased use of soy products in this population has not been previously documented.