Expression of STAT3 in human gastric cancer tissues.

<p>The expression and localization of STAT3, IL-6, VEGF, and survivin in gastric cancer cells were determined using immunohistochemical staining. There was weak or negative expression of STAT3 in adjacent normal mucosa. However, there was strong expression of phosphorylated STAT3 in gastric cancer tissues. The STAT3 staining was mainly localized in the nuclei of tumor epithelial cells, which was indicated by numerous yellowish granules. STAT3 overexpression was associated with with increased expression of IL-6, surviving, and VEGF as well as with increased vessel density (Original magnification of A1-A3 and B1-B3, ×400; A4 and B4, ×200)..