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Updated: Aug 15, 2026

Changes in Mammary Gland Morphology and Breast Cancer Risk in Rats
Published on: October 16, 2010
Cancer risk in menopausal women
Carlo La Vecchia1, Louise A Brinton, Anne McTiernan
1Istituto di Ricerche Farmacologiche Mario Negri, Via Eritrea 62, 20157 Milano.
Abstract:
The incidence for breast and other female-hormone-related neoplasms levels off after menopause. The relative risk (RR) of breast cancer is moderately elevated in current and recent users of hormone replacement therapy (HRT) and increases by about 2.3% per year with longer duration of use, but the effect drops after cessation. Unopposed oestrogen use is strongly related to endometrial cancer risk but cyclic combined oestrogen-progestin treatment appears to reduce this side-effect. However, combined HRT may be associated with higher risk of breast cancer as compared to unopposed oestrogens. Ovarian cancer may also be unfavourably influenced by the use of HRT. HRT has been related to decreased risk of colorectal cancer, the overall RR being about 0.8. Tamoxifen and other selective oestrogen receptor modulators (SERMs) may have a favourable effect on the risk of breast cancer but their risk-benefit profile requires further quantification. The potential effect of 'natural' SERMs (phytoestrogens) on cancer risk remains undefined.
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