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Since little is known about the efficacy of Oct4 as a potential biomarker for gastric cancer (GC), we investigated its expression in GC tissues and its relationship to various clinicopathological parameters.<\/jats:p><\/jats:sec><jats:sec><jats:title>Methods<\/jats:title><jats:p>Primary tumor tissues and matching, adjacent non\u2010cancerous tissues were obtained from 62 GC patients, and Oct4 expression was examined by reverse transcription\u2010PCR (RT\u2010PCR) and real\u2010time PCR. Twenty biopsy specimens of atrophic gastritis and gastric ulcer individually were collected as control. To detect Oct4 expression in the paired GC and non\u2010cancerous tissues at the protein level, Western blotting and immunohistochemistry (IHC) were employed. Correlation analyses were conducted to assess the relationship between Oct4 expression and clinicopathological parameters.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>Oct4 expression levels were higher in GC tissues compared to matching, adjacent non\u2010cancerous tissues, atrophic gastritis and gastric ulcer tissues. Additionally, Oct4 expression in GC tumors correlated with their differentiation status, but not with patient age or gender, tumor size, TNM stage, depth of invasion, or the presence of lymph node metastasis.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusions<\/jats:title><jats:p>Oct4 may be a potential biomarker for the initiation, progression, and differentiation of human GC. J. Surg. Oncol. 2009;99:414\u2013419. \u00a9 2009 Wiley\u2010Liss, Inc.<\/jats:p><\/jats:sec>","DOI":"10.1002\/jso.21270","type":"journal-article","created":{"date-parts":[[2009,4,3]],"date-time":"2009-04-03T14:51:02Z","timestamp":1238770262000},"page":"414-419","source":"Crossref","is-referenced-by-count":71,"title":["Oct4, a novel marker for human gastric 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