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    Br J Cancer. 2000 Nov;83(9):1231-3.

    Breast cancer risk in male twins: joint analyses of four twin cohorts in Denmark, Finland, Sweden and the United States.

    Source

    ICRF General Practice Research Group, University of Oxford, Oxford, UK.

    Abstract

    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.

    Copyright 2000 Cancer Research Campaign.

    PMID:
    11027438
    [PubMed - indexed for MEDLINE]
    PMCID:
    PMC2363585
    Free PMC Article

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