Revista médica de Chile
versión impresa ISSN 0034-9887
ARAYA O, Juan Carlos et al. Mutations of TP53 suppressor gene in pre-neoplastic and neoplastic lesions of the stomach. Rev. méd. Chile [online]. 2003, vol.131, n.4, pp. 359-365. ISSN 0034-9887. http://dx.doi.org/10.4067/S0034-98872003000400002.
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-µm 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% 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 (Rev Méd Chile 2003; 131: 359-65).
Palabras clave : Adenocarcinoma; Genes; supressor; tumor; Metaplasia.