Mutación puntual del gen supresor de tumores TP53 en lesiones preneoplásicas y neoplásicas del estómago / Mutations of TP53 suppressor gene in pre-neoplastic and neoplastic lesions of the stomach: cross-sectional study in a high risk region
Rev. méd. Chile
;
131(4): 359-365, abr. 2003. ilus, tab
Artigo
em Espanhol
| LILACS
| ID: lil-348362
ABSTRACT
Background: In the current model for the development of gastric cancer, regions of multifocal atrophic gastritis give rise to intestinal metaplasia, dysplasia and finally, adenocarcinoma. Aim: To study the frequency and characteristics of TP53 gene mutations in preneoplastic and neoplastic lesions of the stomach. Material and methods: DNA sequencing of the TP53 gene was performed in 46 patients with gastric carcinoma. Normal mucosa, intestinal metaplasia and invasive adenocarcinoma tissues were obtained by scraping 6-Ám histological sections from formalin-fixed and paraffin-embedded tissue. Results: DNA sequencing of exons 5-9 of the TP53 gene demonstrated a mutation in 31 percent of patients. These findings were seen both in tumoral tissue (13 cases) and in intestinal metaplasia (2 cases). Most mutations were found in exons 5 and 8, and the majority of them were transitions (10 out of 19 mutations). Discussion: Patients with gastric cancer showed a frequency of TP53 mutations similar to that previously communicated in populations with low gastric cancer risk. Moreover, there was a predominance of transitions, genetic alterations that are identified with carcinogenesis associated with N-nitrosamine compounds. Finally, mutations of TP53 gene were detected in areas of intestinal metaplasia
Texto completo:
DisponíveL
Índice:
LILACS (Américas)
Assunto principal:
Neoplasias Gástricas
/
Supressão Genética
/
Genes p53
Tipo de estudo:
Estudo de etiologia
/
Estudo observacional
/
Estudo de prevalência
/
Estudo prognóstico
/
Fatores de risco
Limite:
Feminino
/
Humanos
/
Masculino
Idioma:
Espanhol
Revista:
Rev. méd. Chile
Assunto da revista:
Medicina
Ano de publicação:
2003
Tipo de documento:
Artigo
/
Documento de projeto
País de afiliação:
Chile
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