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Delaying childbirth may reduce risk of an aggressive form of breast cancer
Date:12/12/2012

SEATTLE Younger women who wait at least 15 years after their first menstrual period to give birth to their first child may reduce their risk of an aggressive form of breast cancer by up to 60 percent, according to a Fred Hutchinson Cancer Research Center study. The findings, by Christopher I. Li, M.D., Ph.D., a member of the Public Health Sciences Division at Fred Hutch, are published online in Breast Cancer Research and Treatment.

"We found that the interval between menarche and age at first live birth is inversely associated with the risk of triple-negative breast cancer," Li said. While relatively uncommon, triple-negative breast cancer is a particularly aggressive subtype of the disease that does not depend on hormones such as estrogen to grow and spread. This type of cancer, which accounts for only 10 percent to 20 percent of all breast cancers, does not express the genes for estrogen receptor (ER), progesterone receptor (PR) or HER2/neu and therefore does not respond to hormone-blocking drugs such as Tamoxifen.

The study by Li and colleagues in the Public Health Sciences and Human Biology divisions at Fred Hutch is the first to look at how the interval between first menstrual period and age at first birth is related to the risk of this particular type of breast cancer. It is also the first study to look at the relationship between reproductive factors and breast cancer risk among premenopausal women, who have a higher risk of triple-negative and HER2-overexpressing breast cancer than postmenopausal women.

The study also confirmed several previous studies that have suggested that breast-feeding confers a protective effect against triple-negative disease. "Breast-feeding is emerging as a potentially strong protective factor against one of the most aggressive forms of breast cancer," Li said.

The mechanism by which breast-feeding and delaying childbirth reduces the risk of this form of breast cancer is unclear, Li sai
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Contact: Kristen Woodward
kwoodwar@fhcrc.org
206-667-5095
Fred Hutchinson Cancer Research Center
Source:Eurekalert

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