EPIDERMAL GROWTH FACTOR-RECEPTOR EXPRESSION CORRELATES WITH TUMOR-CELL PROLIFERATION AND PROGNOSIS IN GASTRIC-CANCER

Currently, the most accurate prognostic indicator in gastric cancer is stage. Studies on proliferating cell nuclear antigen (PCNA) in gastri c cancer have demonstrated that the PCNA labeling index correlates wit h depth of invasion, organ metastasis, vascular invasion, and tumor st age, suggesting that this marker may be a valuable prognostic factor. Epidermal growth factor (EGF) promotes the growth of cells of both ect odermal and mesodermal origin, and plays an important role in cellular proliferation and differentiation. Furthermore, there has been increa sing evidence that growth factors and their receptors are involved in carcinogenesis. The aim of this study was to investigate the correlati on between expression of the EGF-receptor (EGF-r) and proliferative ac tivity (PCNA labeling index) in gastric cancer by immunohistochemical analysis. Our preliminary results on 56 gastric cancers indicate that the PCNA labeling index correlates with EGF-r immunoreactivity. Furthe rmore, survival was significantly lower in patients with EGF-r positiv e tumors and a high PCNA labeling index. These in situ observations su ggest that EGF-r may play an important role in the growth regulation o f human gastric carcinomas.