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To test the hypothesis that in utero exposure to high levels of oestrogen increases the risk of male breast cancer, we followed 115 235 male twins for more than 3.5 million person-years at risk. We observed 11 cases of male breast cancer versus 16.16 expected based on national rates (standardized rate ratio 0.68, 95% confidence interval 0.34-1.22) and conclude that any adverse influence of in utero oestrogen exposure is likely to be small.

Original publication

DOI

10.1054/bjoc.2000.1468

Type

Journal article

Journal

Br J Cancer

Publication Date

11/2000

Volume

83

Pages

1231 - 1233

Keywords

Breast Neoplasms, Male, Cohort Studies, Denmark, Diseases in Twins, Estrogens, Female, Finland, Humans, Male, Pregnancy, Prenatal Exposure Delayed Effects, Risk Factors, Sweden, Twins, Twins, Dizygotic, Twins, Monozygotic, United States