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| Content Provider | Springer Nature Link |
|---|---|
| Author | Silvera, Stephanie A. N. Miller, Anthony B. Rohan, Thomas E. |
| Copyright Year | 2005 |
| Abstract | Family history of breast cancer is an established risk factor for breast cancer. In addition, there is evidence that oral contraceptive use may be associated with a moderate increase in breast cancer risk. The three cohort studies that have investigated the relationship between oral contraceptive use and breast cancer risk among women with a family history of breast cancer have yielded mixed results, possibly due to the relatively small sample sizes employed and/or differences in the selection of covariates for inclusion in multivariate models. Therefore, we examined the association between oral contraceptive use and breast cancer risk in a large cohort study in Canada. The cohort consisted of the 27,318 women in the Canadian National Breast Screening Study who reported a family history of breast cancer on enrolment into the study. Linkages to national mortality and cancer databases yielded data on deaths and cancer incidence, with follow-up ending between 1998 and 2000, depending upon the province. During a mean of 16.0 years of follow-up, we observed 1707 incident cases of breast cancer among women with any history of breast cancer of which 795 cases occurred among women with a mother, sister, and/or daughter with breast cancer. Among women with any family history of breast cancer, ever use of oral contraceptives was associated with a 12% reduction in risk of breast cancer (95% confidence interval [CI]=0.73–1.07), and there was an inverse trend with increasing duration of use of borderline statistical significance (ptrend=0.03). Although we also observed a 25% lower risk of breast cancer associated with oral contraceptive use of greater than 84 months versus never use among women with a first degree relative with breast cancer, this finding was not statistically significant (95% CI=0.47–1.19, ptrend=0.48). Our data raise the possibility that relatively long duration of oral contraceptive use may be inversely associated with risk among women with a family history of breast cancer. |
| Starting Page | 1059 |
| Ending Page | 1063 |
| Page Count | 5 |
| File Format | |
| ISSN | 09575243 |
| Journal | Cancer Causes & Control |
| Volume Number | 16 |
| Issue Number | 9 |
| e-ISSN | 15737225 |
| Language | English |
| Publisher | Kluwer Academic Publishers |
| Publisher Date | 2005-01-01 |
| Publisher Place | Dordrecht |
| Access Restriction | One Nation One Subscription (ONOS) |
| Subject Keyword | breast neoplasm oral contraceptives family history prospective cohort National Breast Screening Study Cancer Research Public Health/Gesundheitswesen Hematology Oncology Epidemiology |
| Content Type | Text |
| Resource Type | Article |
| Subject | Cancer Research Oncology |
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