Brief report

Cancer Causes & Control

, 22:1061

First online:

Telomere length in peripheral blood and breast cancer risk in a prospective case-cohort analysis: results from the Sister Study

  • Sangmi KimAffiliated withEpidemiology Branch, National Institute of Environmental Health Sciences Email author 
  • , Dale P. SandlerAffiliated withEpidemiology Branch, National Institute of Environmental Health Sciences
  • , Gleta CarswellAffiliated withLaboratory of Molecular Carcinogenesis, National Institute of Environmental Health Sciences
  • , Lisa A. De RooAffiliated withEpidemiology Branch, National Institute of Environmental Health Sciences
  • , Christine G. ParksAffiliated withEpidemiology Branch, National Institute of Environmental Health Sciences
  • , Richard CawthonAffiliated withUniversity of Utah
  • , Clarice R. WeinbergAffiliated withBiostatistics Branch, National Institute of Environmental Health Sciences
  • , Jack A. TaylorAffiliated withEpidemiology Branch, Laboratory of Molecular Carcinogenesis, National Institute of Environmental Health Sciences

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Abstract

Objective

Telomeres are required for maintaining genomic integrity and may play a role in carcinogenesis. Some, but not all, epidemiologic studies have found that short telomeres in leukocytes are associated with an increased risk of breast cancer. To further elucidate this potential association, we examined telomere length in relation to breast cancer risk in prospectively collected blood samples from the Sister Study, a cohort of women aged 35–74 years who have a sister with breast cancer.

Methods

We performed a case-cohort analysis comparing incident breast cancer cases (n = 342) with a subcohort (n = 735), randomly selected from 29,026 participants, enrolled by June 1, 2007. Relative telomere length in peripheral blood cells was estimated using a single-tube monochrome multiplex quantitative PCR assay.

Results

No association was observed between telomere length and breast cancer risk. Compared with the longest quartile, hazard ratios (HR) associated with the second, third, and the shortest quartile were 0.91 [95% confidence interval (95% CI): 0.62–1.34], 1.11 (95% CI: 0.77–1.60), and 0.93 (95% CI: 0.64–1.35), respectively. Subgroup analyses by menopausal status, invasiveness, or estrogen receptor status of breast cancer did not reveal evidence of association between telomere length in blood cells and subsequent breast cancer risk.

Conclusions

This prospective investigation does not support telomere length in blood cells as a biomarker for breast cancer risk.

Keywords

Breast cancer Telomere length Prospective study Biomarker qPCR