Elevated FOXO6 expression correlates with progression and prognosis in gastric cancer
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Jia-Hong Wang1,*, Hong-sheng Tang1,*, Xiao-Shan Li2,*, Xiang-Liang Zhang1, Xian-Zi Yang1, Li-Si Zeng1, Qiang Ruan1, Yong-Hong Huang1, Gao-Jie Liu1, Jin Wang1,** and Shu-Zhong Cui1,**
1Department of Abdominal Surgery, Affiliated Cancer Hospital & Institute of Guangzhou Medical University, Guangzhou, 510095, Guangdong, China
2Department of Medical Oncology, Affiliated Cancer Hospital & Institute of Guangzhou Medical University, Guangzhou, 510095, Guangdong, China
*These authors have contributed equally to this work
**Shu-Zhong Cui and Jin Wang jointly supervised this work
Shu-Zhong Cui, email: email@example.com
Jin Wang, email: firstname.lastname@example.org
Keywords: FOXO6, gastric cancer, aggressiveness, prognosis
Received: December 08, 2016 Accepted: January 24, 2017 Published: March 06, 2017
The FOXO6 correlated with tumor progression in a wide range of carcinomas, yet little is known in gastric cancer. The expression of FOXO6 and matrix metallopeptidase 9 (MMP-9) was assessed by immunohistochemistry in 192 gastric carcinoma specimens. The correlation between FOXO6 expression with MMP-9, clinicopathological/prognostic value in gastric cancer was examined. FOXO6 overexpression was significantly associated with depth of invasion, lymph node metastasis and stage of disease. In univariate and multivariate analyses, FOXO6 was an independent prognostic factor for both overall survival (OS) and recurrence-free survival (RFS). Moreover, FOXO6 over-expression was correlated with poor prognosis in patients subgroups stratified by tumor size, depth of invasion and lymph node metastasis. FOXO6 expression was increased in both prominent serosal invasion group and lymph node metastasis group. In addition, FOXO6 expression was positively correlated with MMP-9 among 192 gastric cancer tissues. Patients with FOXO6 over-expression had poor OS and shorter RFS in low and high invasiveness groups. Furthermore, stratified analysis showed that the TNM stage I patients with high FOXO6 expression had poor prognosis than those with low FOXO6 expression. In conclusion, FOXO6 overexpression promotes tumor aggressiveness and prognosis, and could be a promising target for prognostic prediction in gastric cancer patients.
Condensed abstract: The aim of this study was to analyze the role of FOXO6 in patients with gastric carcinoma. FOXO6 may play an important role on tumor invasion, metastasis and prognosis. It may also serve as a novel target for prognostic prediction.
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