Diet may play role in rare breast cancer type
Source: Agencies |
July 28, 2012, Saturday
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Print Edition
Print Edition
OLDER women who eat a lot of starchy and sweet carbohydrates may be at increased risk of a less common but deadlier form of breast cancer, according to a recent European study.
The findings from a study of nearly 335,000 European women, published in the American Journal of Clinical Nutrition, do not prove that sweets, French fries and white bread contribute to breast cancer - but they do hint at a potential factor in a little understood form of breast cancer.
Specifically, the study found a link between high "glycemic load" and breast cancers that lack receptors for the female sex hormone estrogen, so-called "ER-negative" breast cancers.
A high glycemic load essentially means a diet heavy in foods that cause a rapid spike in blood sugar, such as processed foods made from white flour, potatoes and sweets.
The study, conducted by Isabelle Romieu of the International Agency for Research on Cancer in Lyon, France, looked at women who took part in a long-running European study on nutrition factors and cancer risk.
Of these, 11,576 developed breast cancer over a dozen years. Overall, there was no link between breast cancer risk and glycemic load, as estimated from completed diet questionnaires.
But the picture changed when researchers focused on postmenopausal women with ER-negative cancer. Among women in the top 20 percent for glycemic load, there were 158 cases of breast cancer, versus 11 cases in the bottom 20 percent - a 36 percent higher risk.
ER-negative tumors account for about one quarter of breast cancers. They typically have a poorer prognosis than ER-positive cancers.
The findings from a study of nearly 335,000 European women, published in the American Journal of Clinical Nutrition, do not prove that sweets, French fries and white bread contribute to breast cancer - but they do hint at a potential factor in a little understood form of breast cancer.
Specifically, the study found a link between high "glycemic load" and breast cancers that lack receptors for the female sex hormone estrogen, so-called "ER-negative" breast cancers.
A high glycemic load essentially means a diet heavy in foods that cause a rapid spike in blood sugar, such as processed foods made from white flour, potatoes and sweets.
The study, conducted by Isabelle Romieu of the International Agency for Research on Cancer in Lyon, France, looked at women who took part in a long-running European study on nutrition factors and cancer risk.
Of these, 11,576 developed breast cancer over a dozen years. Overall, there was no link between breast cancer risk and glycemic load, as estimated from completed diet questionnaires.
But the picture changed when researchers focused on postmenopausal women with ER-negative cancer. Among women in the top 20 percent for glycemic load, there were 158 cases of breast cancer, versus 11 cases in the bottom 20 percent - a 36 percent higher risk.
ER-negative tumors account for about one quarter of breast cancers. They typically have a poorer prognosis than ER-positive cancers.
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