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. 2015 Oct;39(5):418-21.
doi: 10.1111/1753-6405.12457.

Cancers in Australia in 2010 attributable to total breastfeeding durations of 12 months or less by parous women

Susan J Jordan  1   2 , Louise F Wilson  1 , Christina M Nagle  1   2 , Adele C Green  1   2   3 , Catherine M Olsen  1   2 , Christopher J Bain  1   4 , Nirmala Pandeya  1   2 , David C Whiteman  1   2 , Penelope M Webb  1   2
Affiliations

Cancers in Australia in 2010 attributable to total breastfeeding durations of 12 months or less by parous women

Susan J Jordan et al. Aust N Z J Public Health. 2015 Oct.

Abstract

Objectives: To estimate the proportion and number of cancers occurring in Australia in 2010 attributable to parous women having breastfed for total durations of ≤12 months.

Methods: We estimated the population attributable fraction (PAF) of breast cancers (the only cancer site with convincing evidence of causal association) associated with women breastfeeding for ≤12 months in total, using standard formulae incorporating breastfeeding prevalence data, relative risks associated with breastfeeding and cancer incidence. We also estimated the proportion change in disease incidence (potential impact fraction [PIF]) that might have occurred under two hypothetical scenarios of women breastfeeding for longer durations.

Results: An estimated 235 (1.7%) breast cancer cases that occurred in Australian in 2010 could be attributed to women breastfeeding for total durations of ≤12 months. Assuming a hypothetical increase in breastfeeding, we estimated that the number of breast cancers prevented would range from 36 to 51 (prevented fraction = 0.3% to 0.4%).

Conclusions: More than 200 breast cancers were attributable to women breastfeeding for total durations of ≤12 months.

Implications: Policies to increase breastfeeding duration may help prevent breast cancers in the future.

Keywords: breast feeding; cancer; population attributable fraction; potential impact fraction; risk factor.

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