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Study identifies potential 'safe period' for hormone replacement use
Date:2/2/2009

th use of estrogen and progesterone increases significantly and substantially within three years of beginning hormone use. The data showed no increased risk for women who used estrogen and progesterone for less than two years, potentially identifying a "safe" period for estrogen and progesterone use.

The study also found no increased risk of breast cancer in women who had stopped using estrogen and progesterone two or more years ago, suggesting a window of two to three years for the risks of estrogen and progesterone both to become apparent after initial use and to diminish after cessation. Few estimates of risk within two to three years of initiation and cessation are available, so these findings need replication in other large studies.

The study found the use of estrogen and progesterone was associated with a doubling of risk of lobular cancer after three years of use, and a doubling of risk of ductal cancer with 10 years of use. Estrogen-only use was not associated with increased risk of ductal cancer, even after 20 years of use, but was associated with a 50 percent increase in risk of lobular cancer after 10 years of use.


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Contact: David Sampson
david.sampson@cancer.org
American Cancer Society
Source:Eurekalert

Page: 1 2

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