Monday, October 23, 2006

Hormone Levels Linked with Premenopausal Breast Cancer

According to the results of a study published in the Journal of the National Cancer Institute, circulating levels of estrogen and testosterone during specific points in the menstrual cycle appear to influence breast cancer risk in premenopausal women. Many breast cancers are hormone responsive, prompting interest in the relationship between serum levels of hormones such as estrogen and the risk of breast cancer. While higher levels of circulating estrogens have been linked with an increased risk of breast cancer in postmenopausal women, less is known about the relationship between circulating hormone levels and breast cancer risk in premenopausal women. Studying the link between hormone levels and breast cancer risk can be challenging in premenopausal women because the levels of many hormones fluctuate over the course of the menstrual cycle. To explore the link premenopausal breast cancer and levels of circulating hormones, researchers evaluated information from the Nurses’ Health Study II. This study enrolled more then 100,000 female nurses who were between the ages of 25 and 42 when the study began in 1989. --Click the title of this post to read the full article from its source--


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