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Article

Aberrant expression of enhancer of zeste homologue 2, correlated with HIF-1α, refines relapse risk and predicts poor outcome for breast cancer

  • Authors:
    • Min Dong
    • Xin-Juan Fan
    • Zhan-Hong Chen
    • Tian-Tian Wang
    • Xing Li
    • Jie  Chen
    • Qu Lin
    • Jing-Yun Wen
    • Xiao-Kun Ma
    • Li Wei
    • Dan-Yun Ruan
    • Ze-Xiao Lin
    • Quentin Liu
    • Xiang-Yuan Wu
    • Xiang-Bo Wan
  • View Affiliations / Copyright

    Affiliations: Department of Medical Oncology, The Third Affiliated Hospital, Sun Yat-sen University, Guangzhou 510630, P.R. China, Department of Pathology, Gastrointestinal Institute, The Sixth Affiliated Hospital, Sun Yat-sen University, Guangzhou 510655, P.R. China, State Key Laboratory of Oncology in South China, Cancer Center, Sun Yat-sen University, Guangzhou 510065, P.R. China
  • Pages: 1101-1107
    |
    Published online on: July 10, 2014
       https://doi.org/10.3892/or.2014.3322
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Abstract

Overexpression of enhancer of zeste homologue 2 (EZH2), a key component of polycomb proteins, has been linked to aggressive tumor behavior in a variety of cancers. In vitro, hypoxia-inducible factor 1α (HIF-1α) transcriptionally activates EZH2 and promotes the progression of breast tumor initiating cells. Here, we characterized the clinicopathological effect of EZH2 and HIF-1α in 410 breast cancer patients. We examined EZH2 and HIF-1α expression using immunohistochemistry and western blotting. We found that EZH2 and HIF-1α were highly expressed in 99 (24.1%) and 272 (70.6%) patients, respectively. EZH2 overexpression was associated with lymphatic invasion (P=0.025), HER2 expression (P=0.005) and hypoxia (P<0.001). Overexpression of EZH2 predicted a poor 5-year overall survival (OS, 74.8 vs. 93.4%, P=0.001), disease-free survival (DFS, 72.2 vs. 88.6%, P=0.031), local failure-free survival (LFFS, 95.7 vs. 97.9%, P=0.045) and distant metastasis-free survival (DMFS, 75.4 vs. 90.5%, P=0.039). Multivariate analysis confirmed that EZH2 is an independent prognostic factor for OS, DFS and LFFS. Moreover, a positive correlation was identified between EZH2 and HIF-1α (r=0.299, P<0.001). Importantly, tumors coexpressing HIF-1α and EZH2 had a poorer OS (P=0.007). In conclusion, our study demonstrated that EZH2 is an independent negative prognostic biomarker for breast cancer. Tumors overexpressing HIF-1α and EZH2 are more prone to disease progression.
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Copy and paste a formatted citation
Spandidos Publications style
Dong M, Fan X, Chen Z, Wang T, Li X, Chen J, Lin Q, Wen J, Ma X, Wei L, Wei L, et al: Aberrant expression of enhancer of zeste homologue 2, correlated with HIF-1α, refines relapse risk and predicts poor outcome for breast cancer. Oncol Rep 32: 1101-1107, 2014.
APA
Dong, M., Fan, X., Chen, Z., Wang, T., Li, X., Chen, J. ... Wan, X. (2014). Aberrant expression of enhancer of zeste homologue 2, correlated with HIF-1α, refines relapse risk and predicts poor outcome for breast cancer. Oncology Reports, 32, 1101-1107. https://doi.org/10.3892/or.2014.3322
MLA
Dong, M., Fan, X., Chen, Z., Wang, T., Li, X., Chen, J., Lin, Q., Wen, J., Ma, X., Wei, L., Ruan, D., Lin, Z., Liu, Q., Wu, X., Wan, X."Aberrant expression of enhancer of zeste homologue 2, correlated with HIF-1α, refines relapse risk and predicts poor outcome for breast cancer". Oncology Reports 32.3 (2014): 1101-1107.
Chicago
Dong, M., Fan, X., Chen, Z., Wang, T., Li, X., Chen, J., Lin, Q., Wen, J., Ma, X., Wei, L., Ruan, D., Lin, Z., Liu, Q., Wu, X., Wan, X."Aberrant expression of enhancer of zeste homologue 2, correlated with HIF-1α, refines relapse risk and predicts poor outcome for breast cancer". Oncology Reports 32, no. 3 (2014): 1101-1107. https://doi.org/10.3892/or.2014.3322
Copy and paste a formatted citation
x
Spandidos Publications style
Dong M, Fan X, Chen Z, Wang T, Li X, Chen J, Lin Q, Wen J, Ma X, Wei L, Wei L, et al: Aberrant expression of enhancer of zeste homologue 2, correlated with HIF-1α, refines relapse risk and predicts poor outcome for breast cancer. Oncol Rep 32: 1101-1107, 2014.
APA
Dong, M., Fan, X., Chen, Z., Wang, T., Li, X., Chen, J. ... Wan, X. (2014). Aberrant expression of enhancer of zeste homologue 2, correlated with HIF-1α, refines relapse risk and predicts poor outcome for breast cancer. Oncology Reports, 32, 1101-1107. https://doi.org/10.3892/or.2014.3322
MLA
Dong, M., Fan, X., Chen, Z., Wang, T., Li, X., Chen, J., Lin, Q., Wen, J., Ma, X., Wei, L., Ruan, D., Lin, Z., Liu, Q., Wu, X., Wan, X."Aberrant expression of enhancer of zeste homologue 2, correlated with HIF-1α, refines relapse risk and predicts poor outcome for breast cancer". Oncology Reports 32.3 (2014): 1101-1107.
Chicago
Dong, M., Fan, X., Chen, Z., Wang, T., Li, X., Chen, J., Lin, Q., Wen, J., Ma, X., Wei, L., Ruan, D., Lin, Z., Liu, Q., Wu, X., Wan, X."Aberrant expression of enhancer of zeste homologue 2, correlated with HIF-1α, refines relapse risk and predicts poor outcome for breast cancer". Oncology Reports 32, no. 3 (2014): 1101-1107. https://doi.org/10.3892/or.2014.3322
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