A prospective study of urinary oestrogen excretion and breast cancer risk.
To test the hypothesis that high levels of endogenous oestrogens increase the risk for developing breast cancer, concentrations of oestrone, oestradiol and oestriol were measured in 24 h urine samples from 1000 women participants in a prospective study of breast cancer on the island of Guernsey.
Sixty-nine subjects were diagnosed with breast cancer subsequent to urine collection.
Among women who were premenopausal at the time of urine collection, cases excreted less oestrogen than controls ; the odds ratios (95% CI) for breast cancer in the middle and upper thirds of the distribution of oestrogen excretion, in comparison with the lower third (reference group, assigned odds ratio=1.0), were 0.5 (0.2-1.2) and 0.4 (0.2-1.1) respectively for oestrone, 0.8 (0.4-1.8) and 0.4 (0.2-1.1) for oestradiol, 0.7 (0.3-1.6) and 0.7 (0.3-1.6) for oestriol and 0.9 (0.4-2.0) and 0.5 (0.2-1.3) for total oestrogens.
Among women who were post-menopausal at the time of urine collection, the trend was in the opposite direction, with an increase in risk associated with increased oestrogen excretion ; the odds ratios were 0.9 (0.3-2.2) and 1.1 (0.5-2.8) for oestrone, 0.8 (0.3-2.3) and 1.9 (0.8-4.6) for oestradiol, 1.5 (0.6 3.9) and 1.8 (0.7-4.6) for oestriol and 0.9 (0.4-2.6) and 1.9 (0.7-4.7) for total oestrogens.
The trends of increasing risk with increasing oestrogen excretion among post-menopausal women were statistically significant for oestradiol (P=0.022) and for total oestrogens (P=0. (...)
Mots-clés Pascal : Tumeur maligne, Glande mammaire, Facteur risque, Epidémiologie, Oestrogène, Urine, Prospective, Homme, Glande mammaire pathologie, Ile Guernesey
Mots-clés Pascal anglais : Malignant tumor, Mammary gland, Risk factor, Epidemiology, Estrogen, Urine, Prospective, Human, Mammary gland diseases
Notice produite par :
Inist-CNRS - Institut de l'Information Scientifique et Technique
Cote : 96-0318097
Code Inist : 002B20E02. Création : 10/04/1997.