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Breast Cancer Res Treat. 2006 Aug;98(3):303-9. Epub 2006 Mar 15.

Increased prevalence of prior breast cancer in women with newly diagnosed diabetes.

Author information

1
Institute for Clinical Evaluative Sciences, Toronto, Ontario, Canada. Lorraine.Lipscombe@ices.on.ca

Abstract

OBJECTIVE:

There is growing evidence of a link between type 2 diabetes and breast cancer, possibly through insulin resistance and/or hyperinsulinemia. Because insulin levels are at their highest prior to the development of diabetes, breast cancer risk may be even greater during the pre-diabetes period.

RESEARCH DESIGN AND METHODS:

In this cross-sectional study, women aged 55-79 years living in Ontario, Canada, with newly diagnosed diabetes from 1994 to 2002 were identified from a validated, population-based database (N = 82,390). Prior history of breast cancer in this group was recorded from 1964 until their diabetes diagnosis from a linkable cancer registry, and was compared to a similarly aged comparison group without diabetes (N = 411,950).

RESULTS:

Prior breast cancers were identified in 3.7% of women with diabetes and in 3.1% women without diabetes (odds ratio, OR 1.22, 95% confidence interval, CI 1.17-1.27, p < 0.0001). The mean time from breast cancer diagnosis to diabetes diagnosis was 7.9 years. The likelihood of a breast cancer history remained significantly higher in women with diabetes after adjustment for age, income and physician visits (OR 1.13, 95% CI 1.09-1.18, p < 0.0001).

CONCLUSIONS:

These results suggest that breast cancer risk may be increased in the pre-diabetes phase and may have implications for screening and prevention strategies. Further studies are required to better characterize the processes that link insulin resistance, diabetes and breast cancer.

PMID:
16538527
DOI:
10.1007/s10549-006-9166-3
[Indexed for MEDLINE]

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