Cancer Causes & Control

, Volume 28, Issue 6, pp 569–578

Dietary fiber intake and risk of breast cancer defined by estrogen and progesterone receptor status: the Japan Public Health Center-based Prospective Study

  • Saki Narita
  • Manami Inoue
  • Eiko Saito
  • Sarah K. Abe
  • Norie Sawada
  • Junko Ishihara
  • Motoki Iwasaki
  • Taiki Yamaji
  • Taichi Shimazu
  • Shizuka Sasazuki
  • Kenji Shibuya
  • Shoichiro Tsugane
  • for the JPHC Study Group
Original paper

DOI: 10.1007/s10552-017-0881-3

Cite this article as:
Narita, S., Inoue, M., Saito, E. et al. Cancer Causes Control (2017) 28: 569. doi:10.1007/s10552-017-0881-3

Abstract

Purpose

Epidemiological studies have suggested a protective effect of dietary fiber intake on breast cancer risk while the results have been inconsistent. Our study aimed to investigate the association between dietary fiber intake and breast cancer risk and to explore whether this association is modified by reproductive factors and hormone receptor status of the tumor.

Methods

A total of 44,444 women aged 45 to 74 years from the Japan Public Health Center-based Prospective Study were included in analyses. Dietary intake assessment was performed using a validated 138-item food frequency questionnaire (FFQ). Hazard ratios (HRs) and 95% confidence intervals (CIs) for breast cancer incidence were calculated by multivariate Cox proportional hazards regression models.

Results

During 624,423 person-years of follow-up period, 681 breast cancer cases were identified. After adjusting for major confounders for breast cancer risk, inverse trends were observed but statistically non-significant. Extremely high intake of fiber was associated with decreased risk of breast cancer but this should be interpreted with caution due to limited statistical power. In stratified analyses by menopausal and hormone receptor status, null associations were observed except for ER-PR- status.

Conclusions

Our findings suggest that extreme high fiber intake may be associated with decreased risk of breast cancer but the level of dietary fiber intake among Japanese population might not be sufficient to examine the association between dietary fiber intake and breast cancer risk.

Keywords

Breast cancer Dietary fiber intake Estrogen receptor (ER) Progesterone receptor (PR) 

Funding information

Funder NameGrant NumberFunding Note
National Cancer Center Research and Development Fund
  • 23-A-31(toku), 26-A-2
Japan Society for the Promotion of Science
  • 25253051

Copyright information

© Springer International Publishing Switzerland 2017

Authors and Affiliations

  • Saki Narita
    • 1
  • Manami Inoue
    • 2
    • 3
  • Eiko Saito
    • 2
    • 3
  • Sarah K. Abe
    • 1
  • Norie Sawada
    • 3
  • Junko Ishihara
    • 4
  • Motoki Iwasaki
    • 3
  • Taiki Yamaji
    • 3
  • Taichi Shimazu
    • 3
  • Shizuka Sasazuki
    • 3
  • Kenji Shibuya
    • 1
  • Shoichiro Tsugane
    • 3
  • for the JPHC Study Group
  1. 1.Department of Global Health Policy, Graduate School of MedicineThe University of TokyoTokyoJapan
  2. 2.AXA Department of Health and Human Security, Graduate School of MedicineThe University of TokyoTokyoJapan
  3. 3.Epidemiology and Prevention Group, Center for Public Health SciencesNational Cancer CenterTokyoJapan
  4. 4.Department of Nutrition ManagementSagami Women’s UniversityKanagawaJapan

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