Krüppel-like factor 5 in human breast carcinoma: A potent prognostic factor induced by androgens

Kiyoshi Takagi, Yasuhiro Miki, Yoshiaki Onodera, Yasuhiro Nakamura, Takanori Ishida, Mika Watanabe, Satoshi Inoue, Hironobu Sasano, Takashi Suzuki

研究成果: Article査読

28 被引用数 (Scopus)


Krüppel-like factor 5 (intestinal) or Krüppel-like factor 5 (KLF5) is a zinc finger-containing transcription factor and involved in important biological processes including cell proliferation and differentiation. However, clinical significance of KLF5 protein has remained largely unknown in breast cancer. Therefore, in this study, we immunolocalized KLF5 in 113 human breast carcinoma cases. KLF5 immunoreactivity was frequently detected in the nuclei of breast carcinoma cells, and median value of the ratio of KLF5-positive carcinoma cells was 30% and was positively associated with the status of androgen receptor. KLF5 immunoreactivity was also significantly associated with increased risk of recurrence and worse clinical outcome in breast cancer patients by univariate analyses, and subsequent multivariate analyses demonstrated that KLF5 immunoreactivity was an independent prognostic factor for both disease-free and breast cancer-specific survival of the patients. We then examined possible regulation of KLF5 by androgen using MCF-7 breast carcinoma cells. KLF5 mRNA was induced by biologically active androgen 5α-dihydrotestosterone in a dose- and time-dependent manner in MCF-7 cells. In addition, results of transfection experiments demonstrated that proliferation activity of MCF-7 cells was significantly associated with the KLF5 expression level. These findings suggest that KLF5 is an androgen-responsive gene in humanbreast carcinomas and play important roles in the progression of breast carcinomas. KLF5 immunoreactivity is therefore considered a potent prognostic factor in human breast cancers.

ジャーナルEndocrine-Related Cancer
出版ステータスPublished - 2012 12

ASJC Scopus subject areas

  • 内分泌学、糖尿病および代謝内科学
  • 腫瘍学
  • 内分泌学
  • 癌研究


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