Alcohol Consumption Has No Impact on Breast Cancer Survival, According to New Research
Although previous research has linked alcohol consumption to an increased risk of developing breast cancer, a new study has found that drinking before and after diagnosis does not impact survival from the disease. In fact, a modest survival benefit was found in women who were moderate drinkers before and after diagnosis due to a reduced risk of dying from cardiovascular disease, a major cause of mortality among breast cancer survivors.
The study results were published online in the April 8 edition of the Journal of Clinical Oncology. Polly Newcomb, PhD, a member of the Public Health Sciences Division and Head of the Cancer Prevention Program at Fred Hutchinson Cancer Research Center, led the study.
"Our findings should be reassuring to women who have breast cancer because their past experience consuming alcohol is unlikely to impact their survival after diagnosis," said Dr. Newcomb. "This study also provides additional support for the beneficial effect of moderate alcohol consumption with respect to cardiovascular disease."
Study Details
The study was based on data from almost 23,000 women with breast cancer who participated in the Collaborative Breast Cancer Study, a National Cancer Institute–sponsored, multisite, population-based study of risk factors for breast cancer, and the largest such study of its kind. The study began in 1988 and was conducted in New Hampshire, Massachusetts, and Wisconsin. In a smaller follow-up study between 1998 and 2001, about 5,000 study participants with breast cancer were also sent a follow-up questionnaire about their alcohol consumption habits after diagnosis.
Cardiovascular Disease Mortality
Among study participants with a history of breast cancer, the authors found that the amount and type of alcohol a woman reported consuming in the years before her diagnosis was not associated with her likelihood from dying from breast cancer. However, the authors also found that those who consumed a moderate level of alcohol (three to six drinks per week) in the years before their cancer diagnosis were 15% less likely to die from cardiovascular disease than nondrinkers. Moderate wine consumption in particular was associated with a lower risk of cardiovascular disease mortality, while no such benefit was evident for consumption of beer or spirits, or for heavier levels of alcohol consumption.
Similar patterns were evident when considering reported alcohol consumption after breast cancer diagnosis. The amount and type of alcohol a woman consumed after diagnosis did not appear to be associated with survival of breast cancer, but those who consumed alcohol in moderation experienced a 40% to 50% lower mortality rate from cardiovascular disease.
What could account for the difference in alcohol's impact on developing breast cancer risk and on survival from the disease? "It could be that the kind of breast cancer that is more likely to be diagnosed among women who drink may be more responsive to hormone-modifying therapies," Dr. Newcomb said. Alcohol consumption is believed to influence breast cancer risk through increases in estrogen production in both pre- and postmenopausal women.
Funding for the study was provided by grants from the National Cancer Institute and Komen for the Cure. Coauthors included researchers from the University of Wisconsin Paul B. Carbone Comprehensive Cancer Center, Wageningen University in the Netherlands, H. Lee Moffitt Cancer Center, Norris Cotton Cancer Center, the University of North Carolina Lineberger Cancer Center and Research Institute, and Harvard Medical School and Brigham and Women's Hospital.
The content in this post has not been reviewed by the American Society of Clinical Oncology, Inc. (ASCO®) and does not necessarily reflect the ideas and opinions of ASCO®.
