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Published in: Journal of Translational Medicine 1/2014

Open Access 01-12-2014 | Research

Plasma mRNA expression levels of BRCA1 and TS as potential predictive biomarkers for chemotherapy in gastric cancer

Authors: Jie Shen, Jia Wei, Wenxian Guan, Hao Wang, Yitao Ding, Xiaoping Qian, Lixia Yu, Zhengyun Zou, Li Xie, Carlota Costa, Trever Bivona, Rafael Rosell, Baorui Liu

Published in: Journal of Translational Medicine | Issue 1/2014

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Abstract

Objective

Personalized chemotherapy based on predictive biomarkers can maximize efficacy. However, tumor tissue obtained at the time of initial diagnosis will not reflect genetic alterations observed at the time of disease progression. We have examined whether plasma mRNA levels can be a surrogate for tumor levels in predicting chemosensitivity.

Methods

In 150 gastric cancer patients, mRNA levels of BRCA1 and TS were assessed in plasma and paired tumor tissue. The Mann-Whitney U-test was used to compare mRNA expression levels between tumor samples exhibiting in vitro sensitivity or resistance to docetaxel and pemetrexed. All statistical tests were two-sided.

Results

There were significant correlations between plasma and tumor mRNA levels of BRCA1 (rho = 0.696, P < 0.001) and TS (rho = 0.620, P < 0.001). BRCA1 levels in plasma (docetaxel-sensitive: 1.25; docetaxel-resistant: 0.50, P < 0.001) and tumor (docetaxel-sensitive: 8.81; docetaxel-resistant: 4.88, P < 0.001) were positively associated with docetaxel sensitivity. TS levels in plasma (pemetrexed-sensitive: 0.90; pemetrexed-resistant: 1.82, P < 0.001) and tumor (pemetrexed-sensitive: 6.56; pemetrexed-resistant: 16.69, P < 0.001) were negatively associated with pemetrexed sensitivity.

Conclusions

Plasma mRNA expression levels mirror those in the tumor and may have a promising role as potential predictive biomarkers for chemotherapy.
Appendix
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Metadata
Title
Plasma mRNA expression levels of BRCA1 and TS as potential predictive biomarkers for chemotherapy in gastric cancer
Authors
Jie Shen
Jia Wei
Wenxian Guan
Hao Wang
Yitao Ding
Xiaoping Qian
Lixia Yu
Zhengyun Zou
Li Xie
Carlota Costa
Trever Bivona
Rafael Rosell
Baorui Liu
Publication date
01-12-2014
Publisher
BioMed Central
Published in
Journal of Translational Medicine / Issue 1/2014
Electronic ISSN: 1479-5876
DOI
https://doi.org/10.1186/s12967-014-0355-2

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