Cancer Causes & Control

, Volume 23, Issue 6, pp 919–927 | Cite as

Breast-feeding and risk of epithelial ovarian cancer

  • S. J. Jordan
  • K. L. Cushing-Haugen
  • K. G. Wicklund
  • J. A. Doherty
  • M. A. Rossing
Original paper

Abstract

Purpose

Evidence suggests that breast-feeding may decrease the risk of epithelial ovarian cancer but it is not clear whether there is a relationship with duration of breast-feeding, patterns of breast-feeding, or particular histological subtypes of ovarian cancer. We sought to investigate these issues in detail.

Methods

Data from participants in a population-based study of ovarian cancer in western Washington State, USA (2002–2007) who had had at least one birth (881 cases and 1,345 controls) were used to assess relations between patterns of breast-feeding and ovarian cancer. Logistic regression was used to calculate odds ratios (OR) and 95% confidence intervals (CI).

Results

Women who ever breast-fed had a 22 % reduction in risk of ovarian cancer compared with those who never breast-fed (OR = 0.78, 95% CI 0.64–0.96) and risk reduction appeared greater with longer durations of feeding per child breast-fed (OR = 0.56, 95% CI 0.32–0.98 for 18 months average duration breast-feeding versus none). Introduction of supplementary feeds did not substantially alter these effects. The overall risk reduction appeared greatest for the endometrioid and clear cell subtypes (OR per month of average breast-feeding per child breast-fed = 0.944, 95% CI 0.903–0.987).

Conclusions

Among women who have had the opportunity to breast-feed, ever breast-feeding and increasing durations of episodes of breast-feeding for each breast-fed child are associated with a decrease in the risk of ovarian cancer independent of numbers of births, which may be strongest for the endometrioid subtype.

Keywords

Ovarian cancer Breast-feeding Histological subtype 

Notes

Acknowledgments

The study was funded by grants R01 CA112523 and R01 CA87538 from the US National Cancer Institute. SJ is supported by an Early Career Fellowship (public health) from the National Health and Medical Research Council of Australia.

Conflict of interest

The authors declare that they have no conflicts of interest.

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Copyright information

© Springer Science+Business Media B.V. 2012

Authors and Affiliations

  • S. J. Jordan
    • 1
    • 2
  • K. L. Cushing-Haugen
    • 3
  • K. G. Wicklund
    • 3
  • J. A. Doherty
    • 3
    • 4
  • M. A. Rossing
    • 3
    • 5
  1. 1.School of Population HealthThe University of QueenslandHerstonAustralia
  2. 2.Population Health DepartmentThe Queensland Institute of Medical Research, Royal Brisbane HospitalHerstonAustralia
  3. 3.Program in EpidemiologyFred Hutchinson Cancer Research CenterSeattleUSA
  4. 4.Section of Biostatistics and EpidemiologyDartmouth Medical SchoolHanoverUSA
  5. 5.Department of EpidemiologySchool of Public Health and Community Medicine, University of WashingtonSeattleUSA

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