title: Expression of cyclooxygenase-2, p53 and Ki-67 in gastric cancer.
abstract: It has been reported that p53 mutation may contribute to upregulate cyclooxygenase (COX)-2 expression that is observed in malignant tissues. These molecules are involved in carcinogenesis by affecting tumor cell proliferation. The aim of this study was to examine the relationship between COX-2 or p53 expression and clinico-pathological characteristics including tumor cell proliferation in gastric cancer. COX-2 and p53 expressions were investigated with immunostaining, in tissue specimens obtained from 119 patients who underwent surgery for gastric cancer. The Ki-67 labeling index (LI) was counted by Ki-67 immunostaining. COX-2 and p53 expressions correlated significantly with depth of tumor invasion. However, there was no association between COX-2 or p53 expression and survival. p53 expression did not correlate with COX-2 expression. There was no significant difference in various clinicopathological variables between Ki-67 LI subgroups. The mean Ki-67 LI value of COX-2 positive tumors was significantly higher than that of negative tumors. The mean Ki-67 LI value of p53 positive tumors was not significantly higher than that of negative tumors. The mean Ki-67 LI value of both COX-2 and p53 positive tumors was significantly higher than that of both negative tumors. These results imply that COX-2 expression is associated with tumor cell proliferation of gastric cancer.
authors.affiliation: Gastrointestinal Cancer Research Program, Department of Internal Medicine, Chonnam National University School, Gwangju, Korea. yejoo@jnu.ac.kr
authors.forename: Young-Eun
authors.initials: YE
authors.lastname: Joo
authors.forename: Ik-Joo
authors.initials: IJ
authors.lastname: Chung
authors.forename: Young-Kyu
authors.initials: YK
authors.lastname: Park
authors.forename: Yang-Seok
authors.initials: YS
authors.lastname: Koh
authors.forename: Jae-Hyuk
authors.initials: JH
authors.lastname: Lee
authors.forename: Chang-Hwan
authors.initials: CH
authors.lastname: Park
authors.forename: Wan-Sik
authors.initials: WS
authors.lastname: Lee
authors.forename: Hyun-Soo
authors.initials: HS
authors.lastname: Kim
authors.forename: Sung-Kyu
authors.initials: SK
authors.lastname: Choi
authors.forename: Jong-Sun
authors.initials: JS
authors.lastname: Rew
authors.forename: Chang-Soo
authors.initials: CS
authors.lastname: Park
authors.forename: Sei-Jong
authors.initials: SJ
authors.lastname: Kim
mesh_terms: D000328:Adult; D000368:Aged; D051546:Cyclooxygenase 2 / Q000032:analysis*; D005260:Female; D006801:Humans; D007150:Immunohistochemistry; D019394:Ki-67 Antigen / Q000032:analysis*; D008297:Male; D008875:Middle Aged; D011379:Prognosis; D013274:Stomach Neoplasms / Q000737:chemistry* / Q000401:mortality / Q000473:pathology; D016159:Tumor Suppressor Protein p53 / Q000032:analysis*
chemical_list: D019394:Ki-67 Antigen; D016159:Tumor Suppressor Protein p53; D051546:Cyclooxygenase 2