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

Research Paper

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

Xia Li1,3, Jianbo Huang1,2, Xinrong Luo1,2, Dejuan Yang1, Xuedong Yin1,2, Weiyan Peng1, Can Bi1, Guosheng Ren1,2✉, Tingxiu Xiang1✉

1. Chongqing Key Laboratory of Molecular Oncology and Epigenetics, the First Affiliated Hospital of Chongqing Medical University, Chongqing, China;
2. Department of Endocrine and Breast Surgery, the First Affiliated Hospital of Chongqing Medical University, Chongqing, China
3. Department of Oncology, 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: PAX5, Breast cancer, biomarker

This is an open access article distributed under the terms of the Creative Commons Attribution (CC BY-NC) license (https://creativecommons.org/licenses/by-nc/4.0/). See http://ivyspring.com/terms for full terms and conditions.
How to cite this article:
Li X, Huang J, Luo X, Yang D, Yin X, Peng W, Bi C, Ren G, Xiang T. Paired box 5 is a novel marker of breast cancers that is frequently downregulated by methylation. Int J Biol Sci 2018; 14(12):1686-1695. doi:10.7150/ijbs.27599. Available from http://www.ijbs.com/v14p1686.htm