Erschienen in:
01.09.2010 | Translational Research and Biomarkers
Prognostic Role of Estrogen Receptor α and Estrogen Receptor β in Gastric Cancer
verfasst von:
C. Y. Xu, MD, J. L. Guo, MD, Z. N. Jiang, MD, S. D. Xie, MD, J. G. Shen, MD, J. Y. Shen, MD, L. B. Wang, MD
Erschienen in:
Annals of Surgical Oncology
|
Ausgabe 9/2010
Einloggen, um Zugang zu erhalten
Abstract
Background
The presence of estrogen receptor α (ERα) and estrogen receptor β (ERβ) have been reported in cell and tissue level in gastric cancer, but its impact on patients’ survival remains unclear. This study was designed to investigate the expression level of ERα and ERβ and to assess clinical significance of ERα and ERβ expression in gastric cancer.
Methods
The expression level of ERα and ERβ were assessed by reverse-transcriptase polymerase chain reaction (RT-PCR) in 35 surgically resected gastric cancer and corresponding normal tissues and by immunohistochemical staining in 211 surgically resected gastric cancer and match normal tissues.
Results
The expression level between ERα mRNA expression in gastric cancer tissues and match normal tissues had no statistically significant difference. The ERβ mRNA level in normal tissues was significantly higher than that observed in gastric cancer tissues (P = 0.001). Neither ERα nor ERβ mRNA expression levels had significant correlation with clinicopathologic parameters. Forty-eight of 211 (22.7%) gastric cancer tissues showed positive expression of ERα and ERβ detected in gastric cancer. ERα-positive expression correlated with poorer overall survival (P = 0.014), as did the absence of ERβ expression in patients with gastric cancer (P = 0.001). In multivariate analysis, the positive expression of ERα and the absence of ERβ were significant independent prognostic factors for overall survival (hazard ratio 2.159, P = 0.013, and hazard ratio 2.016, P = 0.025 respectively).
Conclusions
Our results indicated that ERα and ERβ were expressed in both gastric cancer and corresponding normal tissues. ERα expression and the absence of ERβ expression are associated with poor survival.