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Breast Cancer Research and Treatment

, Volume 173, Issue 3, pp 657–665 | Cite as

Age-related risk factors associated with primary contralateral breast cancer among younger women versus older women

  • Tae In Yoon
  • Beom Seok Kwak
  • On Vox Yi
  • Seonok Kim
  • Eunhae Um
  • Keong Won Yun
  • Hae-na Shin
  • SaeByul Lee
  • Guiyun Sohn
  • Il Yong Chung
  • Jisun Kim
  • Beom Seok Ko
  • Jong Won Lee
  • Byung Ho Son
  • Sei Hyun Ahn
  • Hee Jeong KimEmail author
Epidemiology

Abstract

Purpose

Contralateral prophylactic mastectomy is increasing, despite unclear evidence of improving survival. To investigate the age-related risk factors for contralateral breast cancer (CBC).

Methods

This study included 8716 patients diagnosed with non-metastatic unilateral invasive breast cancer between 1989 and 2008. Data on primary tumor size, node metastasis, grade and subtype using individual matching were used to adjust for differences in the primary tumor and treatment between younger and older age groups. CBC risk factors, CBC-free survival, and annual CBC risk were analyzed by age.

Results

The younger group included 652 patients aged under 35 years, and the older group included 2608 women aged 35 years or older. The median time to CBC development was 6.1 years. CBC was detected in 6.6% of the women in the younger group and 2.5% of those in the older group. Multivariable analysis revealed a relative CBC risk of 2.48 in younger women compared to older women. The risk was significantly higher among women with human epidermal growth factor receptor 2 (HER2)-overexpressing tumors (hazard ratio [HR] 4.98), a family history of breast cancer (HR 7.79), and anti-hormone therapy (HR 3.46). In younger women with HER2-positive cancer, CBC occurrence peaked at 4.6 years after surgery, in those with hormone receptor-positive cancer, it peaked at 7.1 years after surgery, and in triple-negative disease cases, and it increased steadily over time.

Conclusions

After adjusting for primary breast tumor characteristics, patients < 35 years old had 2.5 times the risk of CBC development compared to the older women. CBC occurrence peaked within 5 years after primary breast cancer in younger women with the HER2-positive subtype and after 5 years in cases with the hormone receptor-positive subtype.

Keywords

Young breast cancer Contralateral breast cancer HER2/neu Metachronous 

Notes

Funding

This research did not receive any specific grant from funding agencies in the public, commercial, or not-for-profit sectors.

Compliance with ethical standards

Conflict of interest

The authors declare that they have conflict of interest

Research involving human participants and/or animals

This article does not contain any studies with human participants performed by any of the authors.

Informed consent

Not applicable.

Supplementary material

10549_2018_5031_MOESM1_ESM.docx (25 kb)
Supplementary material 1 (DOCX 24 KB)

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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  • Tae In Yoon
    • 1
  • Beom Seok Kwak
    • 3
  • On Vox Yi
    • 1
  • Seonok Kim
    • 4
  • Eunhae Um
    • 2
  • Keong Won Yun
    • 2
  • Hae-na Shin
    • 2
  • SaeByul Lee
    • 2
  • Guiyun Sohn
    • 2
  • Il Yong Chung
    • 2
  • Jisun Kim
    • 2
  • Beom Seok Ko
    • 2
  • Jong Won Lee
    • 2
  • Byung Ho Son
    • 2
  • Sei Hyun Ahn
    • 2
  • Hee Jeong Kim
    • 2
    Email author
  1. 1.Division of Breast Surgery, Department of SurgeryDongnam Institute of Radiological and Medical ScienceBusanRepublic of Korea
  2. 2.Division of Breast Surgery, Department of Surgery, College of MedicineUniversity of Ulsan, Asan Medical CenterSeoulRepublic of Korea
  3. 3.Department of SurgeryDongguk University Ilsan HospitalGoyang-siRepublic of Korea
  4. 4.Department of Clinical Epidemiology and Biostatics, College of MedicineUniversity of Ulsan, Asan Medical CenterSeoulRepublic of Korea

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