The incidence of breast cancer in the United States dropped precipitously in 2003, and new research suggests the downward trend was the result of millions of women discontinuing use of hormone replacement therapy.
The drop was most pronounced among women over 50, and was seen mostly with estrogen receptor-positive breast cancers, which are fueled by the hormone estrogen. As many as 14,000 fewer women were diagnosed with breast cancer in 2003 than in 2002, the researchers stated.
“This is big news,” said Dr. Jay Brooks, chairman of hematology/oncology at Ochsner Health System, in Baton Rouge. “This has profound public health implications for women in this country.”
The decline in the number of women taking HRT came just after publication of the results of the landmark Women’s Health Initiative (WHI) trial in 2002. That study, involving 16,608 participants, was halted after researchers found elevated health risks among HRT users, most notably for breast cancer and stroke.
Since then, a debate has raged about the utility and safety of HRT, with health officials advising women to take HRT only when needed and for as short a period as possible.
The authors of the current study looked at data on women in nine regions across the country from 1990 to the end of 2003.
Between 1990 and 1998, the incidence of breast cancer incidence in the United States increased at 1.7 percent per year. Between 1998 and 2003, incidence began to go down at 1 percent per year and, in 2003, there was a 7 percent drop in a single year.
Breast Cancer Rates Drop In US was originally published on blackdoctor.org
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