title: Exogenous estrogens and breast cancer in women with natural menopause.
abstract: Age, age at menopause, and calendar year at menopause were controlled as factors related to estrogen use. Data on 90 breast cancer patients and 83 conrols--all of whom had a natural menopause--showed no relationship between breast cancer and estrogen usage after the start of menopause symptoms.
mesh_terms: D000367:Age Factors; D001943:Breast Neoplasms / Q000209:etiology*; D004967:Estrogens / Q000009:adverse effects*; D005260:Female; D006801:Humans; D008593:Menopause; D008875:Middle Aged; D012189:Retrospective Studies
chemical_list: D004967:Estrogens