title: Expressions of p53 and p21 in primary gastric lymphomas.
abstract: The p21 overexpression is thought to be a consequence of the p53 induced activation of the p21 gene. The immunohistochemical evaluation of p53 and p21 can be a valuable means of assessing the functional status of the p53 gene product. We examined the overexpression of p21 and p53 proteins in primary gastric lymphomas and the correlation with prognosis. A total of 32 cases of gastric lymphomas was classified into low-grade lymphomas of mucosa-associated lymphoid tissue type (n=16) and high-grade B-cell lymphomas (n=16). In low-grade lymphomas, only one case showed p53 positivity and all cases were p21-negative. In high-grade lymphomas, seven cases were p53+/p21- (44%), one case was p53+/p21+ (6%), and eight cases were p53-/p21- (50%). The p53+/p21- cases had a much lower percentage of patients sustaining a continuous complete remission state (3/7, 43%) compared with other cases (6/7, 86%). From these results, we concluded that p21 expression is rare in primary gastric lymphomas. Therefore, p53-positive lymphomas can be assumed as having p53 mutation. And combined studies of p53 and p21 may be used as a prognostic indicator in primary gastric high-grade lymphomas.
authors.affiliation: Department of Pathology, Dankook University, College of Medicine, Cheonan, Korea. jaihyang@yahoo.co.kr
authors.forename: J H
authors.initials: JH
authors.lastname: Go
authors.forename: W I
authors.initials: WI
authors.lastname: Yang
mesh_terms: D000328:Adult; D000368:Aged; D000911:Antibodies, Monoclonal; D005260:Female; D006801:Humans; D007150:Immunohistochemistry; D016393:Lymphoma, B-Cell / Q000737:chemistry* / Q000473:pathology; D008297:Male; D008875:Middle Aged; D010581:Peyer's Patches / Q000737:chemistry / Q000473:pathology; D011379:Prognosis; D016283:Proto-Oncogene Proteins p21(ras) / Q000032:analysis* / Q000276:immunology; D013274:Stomach Neoplasms / Q000737:chemistry* / Q000473:pathology; D016159:Tumor Suppressor Protein p53 / Q000032:analysis* / Q000276:immunology
chemical_list: D000911:Antibodies, Monoclonal; D016159:Tumor Suppressor Protein p53; C501009:HRAS protein, human; D016283:Proto-Oncogene Proteins p21(ras)