title: Prognostic significance of cyclin A in gastric cancer.
abstract: High level of cyclin A promotes carcinogenesis, and overexpression of cyclin A has been associated with poor prognosis of cancer patients. We validated the prognostic role of cyclin A in gastric cancer and evaluated its correlation with expression of an mRNA stability factor HuR. From 342 consecutive histologically confirmed gastric cancer patients were obtained 325 representative tissue specimens for cyclin A and 316 for HuR immunohistochemistry. Specimens were stained by cyclin A and HuR specific monoclonal antibodies. Nuclear immunostaining detected in > or =5% of the tumor cells was considered the cut-off for cyclin A positivity. Positive HuR immunoreactivity was scored as nuclear or cytoplasmic. Associations between scores, clinicopathological factors and survival were calculated by the chi2-test, Fisher's exact test, Kaplan-Meier test and Cox model. Cyclin A detected in the nuclei of cancer cells was positive in 55% (179 of 325) of the specimens; 40% (127 of 316) of the specimens had cytoplasmic and 88% (279 of 316) nuclear immunoreactivity of HuR. Cyclin A expression was an independent prognostic factor for poor survival. Cyclin A immunoreactivity was associated with old age, high stage, proximal location of the tumor, intestinal type, noncurative resection, advanced penetration depth and with nodal metastases but not distant metastases. Furthermore, cyclin A expression was associated with cytoplasmic HuR expression, whereas no association with nuclear HuR was evident. Cyclin A is an independent prognostic factor in gastric cancer, and one mechanism for its overexpression may depend on cytoplasmic localization of HuR.
authors.affiliation: Department of Surgery, Helsinki University Central Hospital, Helsinki, Finland.
authors.forename: Johanna
authors.initials: J
authors.lastname: Mrena
authors.forename: Jan-Patrik
authors.initials: JP
authors.lastname: Wiksten
authors.forename: Arto
authors.initials: A
authors.lastname: Kokkola
authors.forename: Stig
authors.initials: S
authors.lastname: Nordling
authors.forename: Caj
authors.initials: C
authors.lastname: Haglund
authors.forename: Ari
authors.initials: A
authors.lastname: Ristimäki
mesh_terms: D000368:Aged; D000954:Antigens, Surface / Q000378:metabolism; D019925:Cyclin A / Q000276:immunology / Q000378:metabolism*; D051959:ELAV Proteins; D000067780:ELAV-Like Protein 1; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D007150:Immunohistochemistry; D008297:Male; D011379:Prognosis; D016601:RNA-Binding Proteins / Q000378:metabolism; D013274:Stomach Neoplasms / Q000378:metabolism* / Q000473:pathology*; D015996:Survival Rate
chemical_list: D000954:Antigens, Surface; D019925:Cyclin A; D051959:ELAV Proteins; D000067780:ELAV-Like Protein 1; C098770:ELAVL1 protein, human; D016601:RNA-Binding Proteins