Alcohol and Breast Cancer Risk
Posted 8/24/2010
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Here is a new study, published in the Journal of the National Cancer Institute (not the NCI) about alcohol and its relationship to the risk of developing breast cancer. Although this is a single study, it is interesting to note that the finding is that alcohol increases the risk of developing lobular but not ductal (the far more common variety) invasive breast cancers.
Personally, I am always distressed to read about alcohol and breast cancer. Last December there was a study presented in San Antonio that suggested that alcohol use doubled the risk of breast cancer recurrence. I was in Paris when that one came out, and you can be sure I spent a very unhappy five minutes wondering if I could omit wine with that night's dinner. I didn't. But I am aware of the possible associations and risks and feel that this is one more thing to consider in this world of uncertainty and no promises. For all of us, it comes down to (I think) moderation in all things, common sense, and focusing on what believe will most help us. Since the December study indicated that the risk was mostly confined to overweight women, I have chosen to go to the gym every morning and still have a glass of wine with dinner. Please do not read this as a recommendation; it is more an honest confession.
Anyway, here is the latest one:
Contact: Kristine Crane ?? jncimedia@oxfordjournals.org ?? 301-841-1285
jnci.oxfordjournals.org ?? www.oxfordjournals.org/our_journals/jnci/press_room.htm
Alcohol Intake Increases Risk of Certain Types of Breast Cancer
Alcohol increases the risk of lobular and hormone receptor-positive breast cancer, but not necessarily invasive ductal carcinomas, according to a study published August 23 online in The Journal of the National Cancer Institute.
Although alcohol intake is an established risk factor for overall breast cancer, few studies have looked at the relationship between alcohol use and breast cancer risk by subtype of breast cancer. While some studies have shown alcohol use is more strongly related to risk of hormone receptor-positive (estrogen receptor and/or progesterone receptor-positive) breast cancer, not many have looked at breast cancer risk by histology, or whether a tumor is ductal??in the milk ducts??or lobular??in the milk-producing lobules.
To understand how alcohol may influence sub-types of breast cancer, Christopher I. Li, M.D., Ph.D., and colleagues at Fred Hutchinson Cancer Research Center conducted an observational study of a subset of patients in the Women's Health Initiative
(WHI) study, conducted between 1993 and 1998, which included 87,724 postmenopausal women aged 50-79 years.
The researchers looked at the following data from the 2,944 women in the WHI study who developed invasive breast cancer: tumor subtypes and hormone status, alcohol consumption, demographic and lifestyle characteristics, family history of diseases
and reproductive history. Women were categorized as those who never drank, those who formerly drank and those who currently drank. Drinkers were grouped into six categories according to the average number of drinks per week, starting from less than one drink per week to more than 14 drinks per week.
The researchers found that alcohol use is more strongly related to the risk of lobular carcinoma than ductal carcinoma, and more strongly related to hormone-receptor- positive breast cancer than hormone-receptor-negative breast cancer. These results confirm previous findings of an association of alcohol consumption with hormone-positive breast cancer risk, as well as three previous case control studies that identified a stronger association of alcohol with lobular carcinoma. The risks observed did not vary by the type of alcohol women consumed.
The authors write, "We found that women who drank one or more drinks per day had about double the risk of lobular type breast cancer, but no increase in their risk of ductal type breast cancer. It is important to note that ductal cancer is much more
common than lobular cancer accounting for about 70 percent of all breast cancers whereas lobular cancer accounts for only about 10-15 percent of cases."
The study's primary limitation, the authors say, is that alcohol usage was only assessed at the beginning of the study, so the researchers had no information on womens' past alcohol usage, nor their subsequent usage.
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