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HRT increases risk of breast cancer
Title:Effect of hormone replacement therapy on breast cancer risk:
estrogen versus estrogen plus
progestin
Author: R. Ross, et al.
Address: Los Angeles, California
Source: Journal of the National Cancer Institute 92: 328-332
(February) 2000
Summary: Researchers studied 1,897 postmenopausal women with breast cancer
and 1,637 postmenopausal control subjects in this population-based, case-control
study to determine whether combination hormone replacement therapy (HRT)
influences the risk of developing breast cancer. HRT was used by just over half
of the breast cancer patients and control subjects. Among those who used
combination therapy, 50% more used sequential therapy (estrogen and progestin
given sequentially during the month) than continuous therapy (estrogen-progestin
in combination each day). Estrogen replacement alone, no progesterone, increased
the risk of breast cancer only in women who took estrogen for 15 years or more.
Five years of combination therapy increased the risk of breast cancer by 24%,
four times as much as ERT. The excess risk of ERT was limited to in situ disease,
while the risk associated with combination HRT was comparable for all pathologic
stages of breast cancer. However, researchers pointed out that estrogen
substantially reduces the risk of cardiovascular disease, lowers the risk of
osteoporosis, and provides other benefits in the form of better cognition and an
improved sense of well-being. Giving progestins to women who no longer have a
uterus is not recommended because of the added breast cancer risk. But for those
who still have a uterus, progestin reduces their risk of endometrial cancer,
which serves to complicate the issue.
Comment: A lot of hype about 2 recent studies reporting an increase in breast
cancer risk with HRT. The American College of Obstetrics and Gynecology has
issued a press release starting that the studies should not change our present
prescribing methods. It is still believed that the benefit significantly exceeds
the risk for most women.