Reproductive factors and risk of hormone receptor positive and negative breast cancer: a cohort study. - Archive ouverte HAL Access content directly
Journal Articles BMC Cancer Year : 2013

Reproductive factors and risk of hormone receptor positive and negative breast cancer: a cohort study.

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Rebecca Ritte
  • Function : Author
  • PersonId : 950010
Kaja Tikk
  • Function : Author
  • PersonId : 950011
Annekatrin Lukanova
  • Function : Author
  • PersonId : 925868
Anne Tjønneland
  • Function : Author
  • PersonId : 908178
Anja Olsen
  • Function : Author
  • PersonId : 908290
Kim Overvad
  • Function : Author
  • PersonId : 908176
Verena Grote
  • Function : Author
  • PersonId : 950013
Heiner Boeing
  • Function : Author
  • PersonId : 950014
Krasimira Aleksandrova
  • Function : Author
  • PersonId : 925874
Domenico Palli
  • Function : Author
  • PersonId : 911338
Franco Berrino
  • Function : Author
  • PersonId : 925869
Rosario Tumino
  • Function : Author
  • PersonId : 908182
Nick Wareham
  • Function : Author
  • PersonId : 902241
Kay-Tee Khaw
  • Function : Author
  • PersonId : 899925
Timothy Key
  • Function : Author
  • PersonId : 925891
Ruth Travis
  • Function : Author
  • PersonId : 950018
Eliv Lund
  • Function : Author
  • PersonId : 925889
Malin Sund
  • Function : Author
  • PersonId : 925884
Isabelle Romieu
  • Function : Author
  • PersonId : 925892
Sabina Rinaldi
  • Function : Author
  • PersonId : 908200
Melissa Merritt
  • Function : Author
  • PersonId : 950022
Elio Riboli
  • Function : Author
  • PersonId : 908199

Abstract

INTRODUCTION: The association of reproductive factors with hormone receptor (HR)-negative breast tumors remains uncertain. METHODS: Within the EPIC cohort, Cox proportional hazards models were used to describe the relationships of reproductive factors (menarcheal age, time between menarche and first pregnancy, parity, number of children, age at first and last pregnancies, time since last full-term childbirth, breastfeeding, age at menopause, ever having an abortion and use of oral contraceptives [OC]) with risk of ER-PR- (n = 998) and ER+PR+ (n = 3,567) breast tumors. RESULTS: A later first full-term childbirth was associated with increased risk of ER+PR+ tumors but not with risk of ER-PR- tumors (>=35 vs. <=19 years HR: 1.47 [95%CI 1.15-1.88] ptrend < 0.001 for ER+PR+ tumors; >=35 vs. <=19 years HR: 0.93 [95%CI 0.53-1.65] ptrend = 0.96 for ER-PR- tumors; Phet = 0.03). The risk associations of menarcheal age, and time period between menarche and first full-term childbirth with ER-PR-tumors were in the similar direction with risk of ER+PR+ tumors (phet = 0.50), although weaker in magnitude and statistically only borderline significant. Other parity related factors such as ever a full-term birth, number of births, age- and time since last birth were associated only with ER+PR+ malignancies, however no statistical heterogeneity between breast cancer subtypes was observed. Breastfeeding and OC use were generally not associated with breast cancer subtype risk. CONCLUSION: Our study provides possible evidence that age at menarche, and time between menarche and first full-term childbirth may be associated with the etiology of both HR-negative and HR-positive malignancies, although the associations with HR-negative breast cancer were only borderline significant.
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Dates and versions

inserm-00920375 , version 1 (18-12-2013)

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Rebecca Ritte, Kaja Tikk, Annekatrin Lukanova, Anne Tjønneland, Anja Olsen, et al.. Reproductive factors and risk of hormone receptor positive and negative breast cancer: a cohort study.. BMC Cancer, 2013, 13 (1), pp.584. ⟨10.1186/1471-2407-13-584⟩. ⟨inserm-00920375⟩
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