title: Correlation of COX-2 and K-ras expression to clinical outcome in gastric cancer.
abstract: Recent studies have suggested that K-ras play an important role in the induction of COX-2 expression in tumor cells. In the present study, tumor samples of 89 gastric cancer patients were prepared in tissue microarrays and they were stained by immunohistochemistry with antibodies against COX-2 and K-ras. We investigated the relationship between the protein expressions of COX-2 and K-ras in gastric cancer and their significance as prognostic markers in gastric cancer patients. The over expression rate of COX-2 and K-ras in gastric cancer was 61.8% and 61.8% (55/89) of all the patients, respectively. There was a significant positive correlation between COX-2 and K-ras expression in gastric cancer. COX-2 and K-ras positivity were correlated with depth of invasion and lymph node metastasis, respectively. K-ras positivity was correlated with growth pattern. Patients with COX-2 and K-ras positive tumors had a poorer prognosis than those with COX-2 and K-ras negative tumors. Over expression of COX-2 and K-ras were closely correlated to prognostic of patients with gastric cancer and they educed synergistic effect with carcinogenesis and development in gastric cancer.
authors.affiliation: School of Life Science, Lanzhou University Lanzhou, Gansu Province, People's Republic of China.
authors.forename: Min
authors.initials: M
authors.lastname: Li
authors.forename: Wei
authors.initials: W
authors.lastname: Liu
authors.forename: Yan-Fang
authors.initials: YF
authors.lastname: Zhu
authors.forename: Yong-Lin
authors.initials: YL
authors.lastname: Chen
authors.forename: Bang-Zhi
authors.initials: BZ
authors.lastname: Zhang
authors.forename: Rui
authors.initials: R
authors.lastname: Wang
mesh_terms: D000328:Adult; D000368:Aged; D051546:Cyclooxygenase 2 / Q000378:metabolism*; D005260:Female; D011905:Genes, ras; D006801:Humans; D007150:Immunohistochemistry; D008297:Male; D008875:Middle Aged; D011379:Prognosis; D016283:Proto-Oncogene Proteins p21(ras) / Q000378:metabolism*; D013274:Stomach Neoplasms / Q000378:metabolism* / Q000401:mortality / Q000473:pathology; D046888:Tissue Array Analysis
chemical_list: D051546:Cyclooxygenase 2; D016283:Proto-Oncogene Proteins p21(ras)