Breast Cancer

, Volume 22, Issue 4, pp 399–405

Association of body mass index with risk of luminal A but not luminal B estrogen receptor-positive and HER2-negative breast cancer for postmenopausal Japanese women

  • Yoshimasa Miyagawa
  • Tomohiro Miyake
  • Ayako Yanai
  • Keiko Murase
  • Michiko Imamura
  • Shigetoshi Ichii
  • Yuichi Takatsuka
  • Takashi Ito
  • Seiichi Hirota
  • Masaru Saito
  • Yoshinao Kotoura
  • Keisuke Miyauchi
  • Yasuhisa Fujimoto
  • Takuya Hatada
  • Mitsunori Sasa
  • Yasuo Miyoshi
Original Article

DOI: 10.1007/s12282-013-0493-z

Cite this article as:
Miyagawa, Y., Miyake, T., Yanai, A. et al. Breast Cancer (2015) 22: 399. doi:10.1007/s12282-013-0493-z

Abstract

Background

The impact of body mass index (BMI) on the risk of postmenopausal estrogen receptor (ER)-positive breast cancers has been well documented. However, the mechanism for the impact of BMI on the etiology of luminal A and luminal B subtypes has not yet been identified.

Methods

We analyzed associations between BMI and breast cancers stratified by immunohistochemically defined intrinsic subtypes, and 1,297 Japanese women (615 breast cancer patients and 682 healthy women from a breast cancer screening program) were enrolled in a case–control study. ER-positive/human epidermal growth factor receptor 2 (HER2)-negative breast cancers were classified into luminal A and B subtypes according to Ki67 expression levels.

Results

Higher BMI was significantly positively associated with postmenopausal breast cancer risk for one-unit increase in BMI (adjusted odds ratio (aOR) 1.09, 95 % confidence interval (CI) 1.04–1.15; P = 0.0008). Analyses of postmenopausal women revealed that BMI was consistently and exclusively associated with luminal A incidence (aOR 1.18, 95 % CI 1.10–1.26; P < 0.0001). When BMI was divided into three categories corresponding to those of controls, among postmenopausal women, the observed positive association was confined to luminal A (high vs low, aOR 2.98, 95 % CI 1.53–5.80; P < 0.005), but not luminal B (aOR 0.95, 95 % CI 0.47–1.91) subtypes.

Conclusions

We observed that BMI was significantly positively associated with increased risk of postmenopausal breast cancer for Japanese women with luminal A, but not with luminal B tumor subtype.

Keywords

Body mass indexBreast cancer riskEstrogen receptorLuminal A

Copyright information

© The Japanese Breast Cancer Society 2013

Authors and Affiliations

  • Yoshimasa Miyagawa
    • 1
  • Tomohiro Miyake
    • 1
  • Ayako Yanai
    • 1
  • Keiko Murase
    • 1
  • Michiko Imamura
    • 1
  • Shigetoshi Ichii
    • 1
  • Yuichi Takatsuka
    • 1
  • Takashi Ito
    • 2
  • Seiichi Hirota
    • 2
  • Masaru Saito
    • 3
  • Yoshinao Kotoura
    • 3
  • Keisuke Miyauchi
    • 4
  • Yasuhisa Fujimoto
    • 5
  • Takuya Hatada
    • 6
  • Mitsunori Sasa
    • 7
  • Yasuo Miyoshi
    • 1
  1. 1.Division of Breast and Endocrine, Department of SurgeryHyogo College of MedicineNishinomiyaJapan
  2. 2.Surgical PathologyHyogo College of MedicineNishinomiyaJapan
  3. 3.Maikodai HospitalKobeJapan
  4. 4.Miyauchi ClinicAmagasakiJapan
  5. 5.Tachibana HospitalAmagasakiJapan
  6. 6.Uminosato ClinicMinamiawajiJapan
  7. 7.Tokushima Breast Care ClinicTokushimaJapan