Tamoxifen use, oestrogen binding and serum lipids in postmenopausal women with breast cancer.

Tamoxifen is widely used in the management of breast cancer, including long-term use in women with early disease to reduce recurrence and mortality. Although remarkably side-effect free, concern has been expressed that its anti-oestrogen activity may extend to lipid metabolism and so result in the premature development of coronary heart disease. In a study of breast cancer patients, those taking Tamoxifen tended to have lower cholesterol concentrations (predominantly low-density lipoprotein cholesterol) and raised triglyceride concentrations. These changes are likely to be protective for coronary heart disease, suggesting Tamoxifen has an oestrogenic rather than anti-oestrogenic effect as regards lipid metabolism.