title: Clinical significance of prostaglandin E synthase expression in gastric cancer tissue.
abstract: Studies have linked microsomal prostaglandin E synthase (mPGES)-1 with gastric cancer. The purpose of this study was to determine mPGES-1, mPGES-2, and cytosolic PGES (cPGES) expression in gastric cancer and to evaluate the correlation between mPGES-1 and mPGES-2 expression and clinicopathological factors and cyclooxygenase-2 expression. PGES protein expression was examined by Western blot in gastric cancer cell lines and in biopsy samples from patients with gastric cancer. mPGES-1, mPGES-2, and cPGES protein localizations were examined immunohistochemically in 129 archival gastric cancer surgical resections. mPGES-1 protein expression was found in gastric cancer biopsies and cancer cell lines with differentiated or undifferentiated adenocarcinoma. There was no mPGES-1 expression in nonneoplastic biopsies. All cell lines and tissue samples expressed mPGES-2 and cPGES. Immunohistochemical analysis showed cancer cells expressed mPGES-1 in 47% of cases. mPGES-2 immunoreactivity was seen both in nonneoplastic glandular epithelium and cancer cells; however, cancer cell immunoreactivity was significantly more pronounced in 29% of cases. cPGES expression was constitutive both in nonneoplastic and neoplastic tissues, with no significant variation among cases. mPGES-1 and mPGES-2 expression correlated with cyclooxygenase-2 expression. mPGES-1 and mPGES-2 expression, and tumor-node-metastasis stage had independent prognostic significance under multivariate analysis in patients with gastric cancer overall and in patients with differentiated cancers. However, only tumor-node-metastasis stage and mPGES-2 expression retained independent prognostic significance in patients with poorly differentiated cancers. mPGES-1 and mPGES-2 correlate with clinicopathological factors and may be valuable prognostic factors in gastric cancer.
authors.affiliation: Division of Gastroenterology, Department of Medicine, Nippon Medical School, Graduate School of Medicine, Tokyo 113-8603, Japan.
authors.forename: Katya
authors.initials: K
authors.lastname: Gudis
authors.forename: Atsushi
authors.initials: A
authors.lastname: Tatsuguchi
authors.forename: Ken
authors.initials: K
authors.lastname: Wada
authors.forename: Tetsuro
authors.initials: T
authors.lastname: Hiratsuka
authors.forename: Seiji
authors.initials: S
authors.lastname: Futagami
authors.forename: Yuh
authors.initials: Y
authors.lastname: Fukuda
authors.forename: Teruo
authors.initials: T
authors.lastname: Kiyama
authors.forename: Takashi
authors.initials: T
authors.lastname: Tajiri
authors.forename: Kazumasa
authors.initials: K
authors.lastname: Miyake
authors.forename: Choitsu
authors.initials: C
authors.lastname: Sakamoto
mesh_terms: D000230:Adenocarcinoma / Q000201:enzymology* / Q000401:mortality / Q000473:pathology; D000368:Aged; D015153:Blotting, Western; D051546:Cyclooxygenase 2 / Q000096:biosynthesis; D005260:Female; D006801:Humans; D007150:Immunohistochemistry; D019746:Intramolecular Oxidoreductases / Q000096:biosynthesis*; D053208:Kaplan-Meier Estimate; D008207:Lymphatic Metastasis / Q000473:pathology; D008297:Male; D008875:Middle Aged; D011379:Prognosis; D000071876:Prostaglandin-E Synthases; D013274:Stomach Neoplasms / Q000201:enzymology* / Q000401:mortality / Q000473:pathology
chemical_list: D051546:Cyclooxygenase 2; D019746:Intramolecular Oxidoreductases; C000605862:PTGES protein, human; C000605863:PTGES2 protein, human; D000071876:Prostaglandin-E Synthases