The proliferative activity of mammary epithelial cells in normal tissue predicts breast cancer risk in premenopausal women

Sung Jin Huh, Hannah Oh, Michael A. Peterson, Vanessa Almendro, Rong Hu, Michaela Bowden, Rosina L. Lis, Maura B. Cotter, Massimo Loda, William T. Barry, Kornelia Polyak, Rulla M. Tamimi

Research output: Contribution to journalArticlepeer-review

41 Citations (Scopus)


The frequency and proliferative activity of tissue-specific stem and progenitor cells are suggested to correlate with cancer risk. In this study, we investigated the association between breast cancer risk and the frequency of mammary epithelial cells expressing p27, estrogen receptor (ER), and Ki67 in normal breast tissue. We performed a nested case-control study of 302 women (69 breast cancer cases, 233 controls) who had been initially diagnosed with benign breast disease according to the Nurses' Health Studies. Immunofluorescence for p27, ER, and Ki67 was performed on tissue microarrays constructed from benign biopsies containing normal mammary epithelium and scored by computational image analysis. We found that the frequency of Ki67+ cells was positively associated with breast cancer risk among premenopausal women [OR = 10.1, 95% confidence interval (CI) = 2.12-48.0]. Conversely, the frequency of ER+ or p27+ cells was inversely, but not significantly, associated with subsequent breast cancer risk (ER+:OR=0.70,95%CI, 0.33-1.50; p27+:OR=0.89, 95% CI, 0.45-1.75). Notably, high Ki67+/low p27+ and high Ki67+/low ER+ cell frequencies were significantly associated with a 5-fold higher risk of breast cancer compared with low Ki67+/low p27+ and low Ki67+/low ER+ cell frequencies, respectively, among premenopausal women (Ki67hi/p27lo: OR = 5.08, 95% CI, 1.43-18.1; Ki67hi/ERlo:OR=4.68,95%CI, 1.63-13.5). Taken together, our data suggest that the fraction of actively cycling cells in normal breast tissue may represent a marker for breast cancer risk assessment, which may therefore impact the frequency of screening procedures in at-risk women.

Original languageEnglish
Pages (from-to)1926-1934
Number of pages9
JournalCancer Research
Issue number7
Publication statusPublished - 2016 Apr 1
Externally publishedYes

Bibliographical note

Funding Information:
This work was supported by the National Cancer Institute UM1 CA186107, UM1 CA176726, P01 CA87969, F32 CA156991 (S.J. Huh), T32 CA09001 (H. Oh), P01 CA080111 (K. Polyak), R01 CA046575 (R.M. Tamimi), P01 CA087969 (R.M. Tamimi), Avon Foundation (R.M. Tamimi and K. Polyak), the CJL Foundation (W.T. Barry), US Army Congressionally Directed Research W81XWH-07-1-0294 (K. Polyak) and the Susan G. Komen Foundation (K. Polyak and R.M. Tamimi). The costs of publication of this article were defrayed in part by the payment of page charges. This article must therefore be hereby marked advertisement in accordance with 18 U.S.C. Section 1734 solely to indicate this fact.

Publisher Copyright:
© 2016 AACR.

ASJC Scopus subject areas

  • Oncology
  • Cancer Research


Dive into the research topics of 'The proliferative activity of mammary epithelial cells in normal tissue predicts breast cancer risk in premenopausal women'. Together they form a unique fingerprint.

Cite this