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A large study in Britain concluded that hormone replacement therapy, HRT significantly increases the risk of women developing ovarian cancer.
Figures from the Study of One Million Women indicate that a thousand other women in the UK died from ovarian cancer between 1991 and 2005 because they were treated by HRT.
The researchers, who published their study in the Lancet, said that HRT increased the cancer of the ovaries, uterus and breast.
Government experts said that the advice would not change and that women should be under this treatment for the shortest time possible.
Not only HRT increases the risk of developing ovarian cancer also increases the risk of dying from the disease
Valerie Beral, director of research
Previous results of the Study of One Million Women, published
in 2003, concluded that HRT doubled the risk of breast cancer.
The research produced recommendations that women weigh the risks versus benefits of HRT and take the smallest dose for the shortest time.
The new analysis of 948 576 postmenopausal women showed an increased risk of 20% of developing and dying from ovarian cancer in women under HRT, compared to those who never were subjected to treatment.
This means an additional case of ovarian cancer for every 2,500 women taking HRT and one additional death of death from this cancer every 3,300 patients on therapy.
The risk of developing cancer in women pajo TRH returned to normal levels a few years after stopping treatment.
Study leader, Professor Valerie Beral - director of the
Cancer Research Unit at the University of Oxford - said: "The results of this study are worrying because they show that not only HRT increases the risk of developing cancer ovaries, also increases the risk of dying from the disease. "
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