title: Different roles of p53 between Epstein-Barr virus-positive and -negative gastric carcinomas of matched histology.
abstract: To clarify the role of p53 in the development of Epstein-Barr virus (EBV)-associated gastric carcinoma, we examined DNA-ploidy pattern, the immunoreactivity of p53, p21(WAF1) and Ki-67 and the incidence of mitosis and apoptosis in EBV-positive and -negative gastric carcinomas of similar histology: a lace pattern and/or gastric carcinoma with lymphoid stroma. There was no significant difference in DNA-ploidy pattern, Ki-67 index or frequencies of mitosis and apoptosis between the two groups. In deeply invasive tumours (involving the muscularis propria or deeper), p53-positive ones were rare in the EBV-encoded small RNA (EBER)-positive group and very common in the EBER-negative group, while in superficial tumours, around one-half of them were p53-positive in both groups. In p53-positive superficial tumours, p21(WAF1)-positive ones accounted for 80% in the EBER-positive group and were scarce in the EBER-negative group. It is thus possible that p53 immunoreactivity reflects the overexpression of wild-type p53 and the stabilization of mutant p53 in the EBER-positive and -negative groups, respectively. The role of p53 in tumour development seems to be smaller in EBER-positive than in -negative gastric carcinomas.
authors.affiliation: Department of Pathology, Shiga University of Medical Science, Seta-Tsukinowa-cho, Ohtsu, Shiga, 520-2192, Japan. mori@belle.shiga-med.ac.jp
authors.forename: Suzuko
authors.initials: S
authors.lastname: Moritani
authors.forename: Hiroyuki
authors.initials: H
authors.lastname: Sugihara
authors.forename: Ryoji
authors.initials: R
authors.lastname: Kushima
authors.forename: Takanori
authors.initials: T
authors.lastname: Hattori
mesh_terms: D000230:Adenocarcinoma / Q000235:genetics* / Q000473:pathology / Q000821:virology; D000328:Adult; D000368:Aged; D017209:Apoptosis; D002455:Cell Division; D050759:Cyclin-Dependent Kinase Inhibitor p21; D016213:Cyclins / Q000378:metabolism; D004273:DNA, Neoplasm / Q000032:analysis; D020031:Epstein-Barr Virus Infections / Q000150:complications / Q000235:genetics* / Q000473:pathology; D005260:Female; D016158:Genes, p53 / Q000235:genetics*; D004854:Herpesvirus 4, Human / Q000235:genetics / Q000302:isolation & purification*; D006801:Humans; D019394:Ki-67 Antigen / Q000378:metabolism; D008297:Male; D008875:Middle Aged; D011003:Ploidies; D016601:RNA-Binding Proteins / Q000032:analysis; D012269:Ribosomal Proteins; D013274:Stomach Neoplasms / Q000235:genetics* / Q000473:pathology / Q000821:virology; D016159:Tumor Suppressor Protein p53 / Q000235:genetics / Q000378:metabolism; D014412:Tumor Virus Infections / Q000150:complications / Q000235:genetics* / Q000473:pathology / Q000821:virology
chemical_list: C493956:CDKN1A protein, human; D050759:Cyclin-Dependent Kinase Inhibitor p21; D016213:Cyclins; D004273:DNA, Neoplasm; D019394:Ki-67 Antigen; D016601:RNA-Binding Proteins; D012269:Ribosomal Proteins; D016159:Tumor Suppressor Protein p53; C067169:RPL22 protein, human