The risks and benefits of hormone replacement therapy (HRT) are of considerable interest and importance, especially in terms of whether they differ among subsets of women.
To determine whether HRT is associated with increased risks for breast cancer and total mortality in women with a family history of breast cancer.
Prospective cohort study.
Population-based sample of midwestern postmenopausal women enrolled in an observational study of risk factors for cancer.
Random sample of 41 837 female Iowa residents 55 to 69 years of age.
Incidence rates of and relative risks for breast cancer (n=1085) and total mortality (n=2035) through 8 years of follow-up were calculated by using data from the State Health Registry of Iowa and the National Death Index.
A family history of breast cancer was reported by 12.2% of the cohort at risk.
Among women with a family history of breast cancer, those who currently used HRT and had done so for at least 5 years developed breast cancer at an age-adjusted annual rate of 61 cases per 10 000 person-years (95% Cl, 28 to 94 cases) ; this rate was not statistically significantly higher than the rate in women who had never used HRT (46 cases per 10 000 person-years [CI, 36 to 55 cases]). Among women with a family history, those who used HRT had a significantly lower risk for total mortality than did women who had never used HRT (relative risk, 0.67 [Cl, 0.51 to 0. (...)
Mots-clés Pascal : Carcinome, Glande mammaire, Etude cohorte, Hormone, Traitement substitutif, Prévention, Mortalité, Histoire familiale, Incidence, Etude comparative, Evaluation, Homme, Femelle, Tumeur maligne, Glande mammaire pathologie, Hormone stéroïde, Chimiothérapie, Organisation santé
Mots-clés Pascal anglais : Carcinoma, Mammary gland, Cohort study, Hormone, Replacement therapy, Prevention, Mortality, Family story, Incidence, Comparative study, Evaluation, Human, Female, Malignant tumor, Mammary gland diseases, Steroid hormone, Chemotherapy, Public health organization
Notice produite par :
Inist-CNRS - Institut de l'Information Scientifique et Technique
Cote : 98-0041635
Code Inist : 002B02O. Création : 17/04/1998.