Ryu WS et al. – The results suggest that the presence of ER–β in gastric cancer could have a protective effect against invasiveness of gastric cancer. Further studies are needed to clarify the role of ER–β in gastric cancers.Methods
- ER–α, ER–β proteins extracted from normal stomach, gastric cancer tissues, and cultured gastric cancer cells (KATO–III, mkn28, mkn45, and mkn74) were assessed by Western blot analysis.
- The clinical significance of ER–β was explored using tissue microarray methods and immunohistochemical staining of specimens from 148 gastric cancers.
- Both ER–α and β protein expression were noted in normal and gastric cancer tissues.
- However, in cultured gastric cells, only ER–β was noted in mkn28 and mkn74.
- Of 148 gastric cancers, 67 (45.3%) were ER–β positive.
- The ER–β positive group was associated with lower tumor stage, Lauren's intestinal type, negative perineural invasion, and free of recurrence.
- The ER–β positive group had a better 3–year survival compared with the negative group in survival analysis.