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Published in: BMC Cancer 1/2012

Open Access 01-12-2012 | Research article

Presence of S100A9-positive inflammatory cells in cancer tissues correlates with an early stage cancer and a better prognosis in patients with gastric cancer

Authors: Biao Fan, Lian-Hai Zhang, Yong-ning Jia, Xi-Yao Zhong, Yi-Qiang Liu, Xiao-Jing Cheng, Xiao-Hong Wang, Xiao-Fang Xing, Ying Hu, Ying-Ai Li, Hong Du, Wei Zhao, Zhao-Jian Niu, Ai-Ping Lu, Ji-You Li, Jia-Fu Ji

Published in: BMC Cancer | Issue 1/2012

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Abstract

Background

S100A9 was originally discovered as a factor secreted by inflammatory cells. Recently, S100A9 was found to be associated with several human malignancies. The purpose of this study is to investigate S100A9 expression in gastric cancer and explore its role in cancer progression.

Methods

S100A9 expression in gastric tissue samples from 177 gastric cancer patients was assessed by immunohistochemistry. The expression of its dimerization partner S100A8 and the S100A8/A9 heterodimer were also assessed by the same method. The effect of exogenous S100A9 on motility of gastric cancer cells AGS and BGC-823 was then investigated.

Results

S100A9 was specifically expressed by inflammatory cells such as macrophages and neutrophils in human gastric cancer and gastritis tissues. Statistical analysis showed that a high S100A9 cell count (> = 200) per 200x magnification microscopic field in cancer tissues was predictive of early stage gastric cancer. High S100A9-positive cell count was negatively correlated with lymph node metastasis (P = 0.009) and tumor invasion (P = 0.011). S100A9 was identified as an independent prognostic predictor of overall survival of patients with gastric cancer (P = 0.04). Patients with high S100A9 cell count were with favorable prognosis (P = 0.021). Further investigation found that S100A8 distribution in human gastric cancer tissues was similar to S100A9. However, the number of S100A8-positive cells did not positively correlate with patient survival. The inflammatory cells infiltrating cancer were S100A8/A9 negative, while those in gastritis were positive. Furthermore, exogenous S100A9 protein inhibited migration and invasion of gastric cancer cells.

Conclusions

Our results suggested S100A9-positive inflammatory cells in gastric cancer tissues are associated with early stage of gastric cancer and good prognosis.
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Metadata
Title
Presence of S100A9-positive inflammatory cells in cancer tissues correlates with an early stage cancer and a better prognosis in patients with gastric cancer
Authors
Biao Fan
Lian-Hai Zhang
Yong-ning Jia
Xi-Yao Zhong
Yi-Qiang Liu
Xiao-Jing Cheng
Xiao-Hong Wang
Xiao-Fang Xing
Ying Hu
Ying-Ai Li
Hong Du
Wei Zhao
Zhao-Jian Niu
Ai-Ping Lu
Ji-You Li
Jia-Fu Ji
Publication date
01-12-2012
Publisher
BioMed Central
Published in
BMC Cancer / Issue 1/2012
Electronic ISSN: 1471-2407
DOI
https://doi.org/10.1186/1471-2407-12-316

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