HDAC6 expression is correlated with better survival in breast cancer

Zhenhuan Zhang, Hiroko Yamashita, Tatsuya Toyama, Hiroshi Sugiura, Yoko Omoto, Yoshiaki Ando, Keiko Mita, Maho Hamaguchi, Shin Ichi Hayashi, Hirotaka Iwase

Research output: Contribution to journalArticlepeer-review

220 Citations (Scopus)

Abstract

Purpose: The structure and function of chromatin can be altered by modifications to histone. Histonc acctylation in vivo is a dynamic reversible process governed by histone acetyltransferases (HATs) and histone deacetylases (HDACs). HDAC6 is a unique isoform among the HDACs, and a gene expression pattern study, with cDNA microarray in MCF-7 cells, showed the HDAC6 gene to be late responsive, estrogen induced, and up-regulated. This led us to hypothesize that there was a link between levels of HDAC6 expression and the metastatic potential of breast cancer and also, therefore, the prognosis of these patients. Experimental Design: In the present study, the level of HDAC6 mRNA expression was analyzed with quantitative real-time reverse transcription-PCR, in 135 female patients with invasive breast cancer. HDAC6 protein expression was also determined by immunohistochemistry. An association was sought between HDAC6 expression and various clinicopathologic factors. Results: HDAC6 mRNA was expressed at significantly higher levels in breast cancer patients with small tumors measuring less than 2 cm, with low histologic grade, and in estrogen receptor α- and progesterone receptor-positive tumors. By contrast, no relationship was found between HDAC6 mRNA expression and any of the other clinicopathologic factors, namely, age, menopausal status, and axillary lymph node involvement. Patients expressing high levels of HDAC6 niRNA and protein had a better prognosis than those expressing low levels, in terms of disease-free survival. However, multivariate analysis failed to show that HDAC6 mRNA and protein are an independent prognostic factors for disease-free survival and overall survival. Furthermore, the patients with high levels of HDAC6 mRNA tended to be more responsive to endocrine treatment than those with low levels. Specific HBAC6 staining was found in the nucleus of some normal epithelial cells and in the cytoplasm of the majority of cancer cells. Although postmenopausal patients showed higher HDAC6 protein expression, there were no relationship between protein expression and any other clinicopathologic factors. Conclusions: We conclude that the levels of HDAC6 mRNA expression may have potential both as a marker of endocrine responsiveness and also as a prognostic indicator in breast cancer. Additional investigations are warranted concerning the relationship between EGBAC6 expression and response to endocrine therapy.

Original languageEnglish
Pages (from-to)6962-6968
Number of pages7
JournalClinical Cancer Research
Volume10
Issue number20
DOIs
Publication statusPublished - 2004 Oct 15
Externally publishedYes

ASJC Scopus subject areas

  • Oncology
  • Cancer Research

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