title: Low frequency of apoptosis in Epstein-Barr virus-associated gastric carcinoma with lymphoid stroma.
abstract: In order to understand the character of Epstein-Barr virus (EBV)-associated gastric carcinoma with lymphoid stroma (GCLS), we examined cell proliferation and death in comparison with gastric carcinoma without prominent lymphoid stroma (conventional gastric carcinoma). The EBV-encoded small RNA I (EBER-1) and apoptotic cells were examined by in situ hybridization (ISH) and by terminal deoxynucleotidyl transferase (TdT)-mediated dUTP-biotin nick end-labeling (TUNEL), respectively, on formalin-fixed paraffin-embedded surgical specimens from 22 GCLSs and 23 conventional gastric carcinomas. Immunostaining was performed for the detection of Ki-67 antigen (Ki-67), P53 protein (P53) and bcl-2 oncoprotein (BCL-2). The percentages of apoptotic and Ki-67-positive cells were expressed as apoptotic indices (AI) and Ki-67 labeling indices (KI), respectively. EBER-1 was detected in 19 (86%) GCLSs in contrast to none in conventional carcinomas. Mean AI was 1.8 +/- 0.6 in the EBER-1-positive GCLSs and 3.3 +/- 1.7 in the conventional gastric carcinomas, the value being significantly lower in the former (p < 0.01). Mean KI was 40.0 +/- 10.8 in the GCLSs and 48.5 +/- 9.1 in the conventional gastric carcinomas, the value being significantly lower in the former (p < 0.05). P53 expression showed no significant difference between the 2 categories of carcinoma.
authors.affiliation: First Department of Pathology, School of Life Science, Faculty of Medicine, Tottori University, Yonago, Japan.
authors.forename: S
authors.initials: S
authors.lastname: Ohfuji
authors.forename: M
authors.initials: M
authors.lastname: Osaki
authors.forename: S
authors.initials: S
authors.lastname: Tsujitani
authors.forename: M
authors.initials: M
authors.lastname: Ikeguchi
authors.forename: T
authors.initials: T
authors.lastname: Sairenji
authors.forename: H
authors.initials: H
authors.lastname: Ito
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D017209:Apoptosis / Q000502:physiology*; D014408:Biomarkers, Tumor; D002277:Carcinoma / Q000473:pathology* / Q000821:virology; D005260:Female; D006566:Herpesviridae Infections / Q000473:pathology / Q000821:virology; D004854:Herpesvirus 4, Human / Q000302:isolation & purification; D006801:Humans; D007150:Immunohistochemistry / Q000379:methods; D017403:In Situ Hybridization / Q000379:methods; D008221:Lymphoid Tissue / Q000473:pathology*; D008297:Male; D008875:Middle Aged; D012367:RNA, Viral / Q000032:analysis; D013274:Stomach Neoplasms / Q000473:pathology* / Q000821:virology; D017154:Stromal Cells / Q000473:pathology; D014412:Tumor Virus Infections / Q000473:pathology
chemical_list: D014408:Biomarkers, Tumor; C099537:Epstein-Barr virus encoded RNA 1; D012367:RNA, Viral