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Int J Biol Sci. 2018 Sep 7;14(12):1686-1695. doi: 10.7150/ijbs.27599. eCollection 2018.

Paired box 5 is a novel marker of breast cancers that is frequently downregulated by methylation.

Li X1,2, Huang J1,3, Luo X1,3, Yang D1, Yin X1,3, Peng W1, Bi C1, Ren G1,3, Xiang T1.

Author information

1
Chongqing Key Laboratory of Molecular Oncology and Epigenetics, the First Affiliated Hospital of Chongqing Medical University, Chongqing, China.
2
Department of Oncology, the First Affiliated Hospital of Chongqing Medical University, Chongqing, China.
3
Department of Endocrine and Breast Surgery, the First Affiliated Hospital of Chongqing Medical University, Chongqing, China.

Abstract

Identifying markers for breast cancer is important for both diagnosis and the design of treatment strategies. Recent studies have implicated Paired box 5 (PAX5) as a suppressor in various cancer types, where it is silenced by hypermethylation. However, determining the role of PAX5 in breast cancer requires further study, and the relationship between PAX5 methylation and breast cancer remains unclear. In this study, we found that PAX5 expression was frequently silenced or reduced by methylation in breast cancer cell lines as well as in breast cancer tissues. Restoring expression of PAX5 in breast cancer cells led to tumor suppression through inhibited proliferation and invasion, which resulted from modulation of the cell cycle and altered vascular endothelial growth factor (VEGF) expression. Most importantly, we found that PAX5 methylation status in breast cancer tissues was significantly correlated with patients' age, estrogen receptor (ER) status, progesterone receptor (PR) status, indicating that PAX5 could serve as a marker for breast cancer diagnosis and treatment strategy design.

KEYWORDS:

Breast cancer; PAX5; biomarker

Conflict of interest statement

Competing Interests: The authors have declared that no competing interest exists.

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