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JNCI Journal of the National Cancer Institute 2005 97(8):603-605; doi:10.1093/jnci/dji097
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© 2005 Oxford University Press

BRIEF COMMUNICATION

Male Breast Cancer Incidence Among Atomic Bomb Survivors

Elaine Ron, Takayoshi Ikeda, Dale L. Preston, Shoji Tokuoka

Affiliations of authors: Radiation Epidemiology Branch, Division of Cancer Epidemiology and Genetics, National Cancer Institute, NationalInstitute of Health, Department of Health andHuman Services, Bethesda, MD (ER); Radiation Effects Research Foundation, Nagasaki, Japan (TI); Department of Statistics, Radiation Effects Research Foundation, Hiroshima, Japan (DLP), Radiation Effects Research Foundation, Hiroshima, Japan (ST)

Correspondence to: Elaine Ron, PhD, Radiation Epidemiology Branch, Division of Cancer Epidemiology and Genetics, National Cancer Institute, National Institutes of Health, Department of Health and Human Services, 6120 Executive Blvd., MSC 7362, Bethesda, MD 20892-7362(e-mail: eron{at}mail.nih.gov).

To learn more about the role of ionizing radiation in the development of male breast cancer, we evaluated male breast cancer incidence among 45 880 male members of the Life Span Study cohort of Japanese atomic bomb survivors. Male breast cancers, diagnosed between January 1, 1958, and December 31, 1998, were identified through the Hiroshima and Nagasaki Tumor Registries. Nine male breast cancers were diagnosed among exposed Life Span Study members (crude rate = 1.8 per 100 000 person-years), and three were diagnosed among nonexposed cohort members (crude rate = 0.5 per 100 000 person-years). A statistically significant dose–response relation was observed (excess relative risk per sievert = 8, 95% confidence interval = 0.8 to 48; P = .01). Our finding of a statistically significant association between ionizing radiation and male breast cancer incidence adds to the very limited information that shows an association between radiation exposure and an increased risk of male breast cancer.


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