Fig. 1

Expression of CD44s in ampullary cancer. Representative immunohistochemistry analysis of membranous CD44s staining (×400) showing (a) negative immunoreactivity, (b) weak expression of CD44s in < 25 % of ampullary cancer cells, (c) moderate expression of CD44s in 25 to 50 % of ampullary cancer cells, and (d) dense expression of CD44s in > 50 % of ampullary cancer cells