title: Cancers in Australia in 2010 attributable to total breastfeeding durations of 12 months or less by parous women.
abstract: OBJECTIVE
  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.
  
  
  CONCLUSIONS
  Policies to increase breastfeeding duration may help prevent breast cancers in the future.
authors.affiliation: QIMR Berghofer Medical Research Institute, Queensland.|School of Public Health, The University of Queensland.
authors.forename: Susan J
authors.initials: SJ
authors.lastname: Jordan
authors.affiliation: QIMR Berghofer Medical Research Institute, Queensland.
authors.forename: Louise F
authors.initials: LF
authors.lastname: Wilson
authors.affiliation: QIMR Berghofer Medical Research Institute, Queensland.|School of Public Health, The University of Queensland.
authors.forename: Christina M
authors.initials: CM
authors.lastname: Nagle
authors.affiliation: QIMR Berghofer Medical Research Institute, Queensland.|School of Public Health, The University of Queensland.|Cancer Research UK, Manchester Institute and Institute of Inflammation and Repair, University of Manchester, United Kingdom.
authors.forename: Adele C
authors.initials: AC
authors.lastname: Green
authors.affiliation: QIMR Berghofer Medical Research Institute, Queensland.|School of Public Health, The University of Queensland.
authors.forename: Catherine M
authors.initials: CM
authors.lastname: Olsen
authors.affiliation: QIMR Berghofer Medical Research Institute, Queensland.|National Centre for Epidemiology and Population Health, Research School of Population Health, Australian National University, Australian Capital Territory.
authors.forename: Christopher J
authors.initials: CJ
authors.lastname: Bain
authors.affiliation: QIMR Berghofer Medical Research Institute, Queensland.|School of Public Health, The University of Queensland.
authors.forename: Nirmala
authors.initials: N
authors.lastname: Pandeya
authors.affiliation: QIMR Berghofer Medical Research Institute, Queensland.|School of Public Health, The University of Queensland.
authors.forename: David C
authors.initials: DC
authors.lastname: Whiteman
authors.affiliation: QIMR Berghofer Medical Research Institute, Queensland.|School of Public Health, The University of Queensland.
authors.forename: Penelope M
authors.initials: PM
authors.lastname: Webb
mesh_terms: D000328:Adult; D001315:Australia / Q000453:epidemiology; D001942:Breast Feeding; D001943:Breast Neoplasms / Q000453:epidemiology* / Q000517:prevention & control; D005260:Female; D006801:Humans; D015994:Incidence; D008875:Middle Aged; D010298:Parity; D011159:Population Surveillance; D015995:Prevalence; D012307:Risk Factors; D013997:Time Factors
keywords: breast feeding; cancer; population attributable fraction; potential impact fraction; risk factor