P53 Gene mutation in gallbladder cancer

Roa, I; Melo A.; Roa, J; Araya J.; Villaseca M.; De Aretxabala X.

Abstract

Background: Gallbladder cancer frequency and mortality renders it one of the most important neoplastic diseases in Chile. P53 tumor suppressor gene has been studied in most types of cancer, but there is scarce information about it in gallbladder cancer. Aim: To study the frequency of P53 gene mutation in gallbladder cancer in the ninth region of Chile. Material and methods: In 25 pathological samples of gallbladder cancer, the direct amplification and sequencing of p53 gene exons 5,6,7,8-8 was possible. Results: Seventeen punctual mutations were observed in 13 cases (52%). There were 10 transitions, 5 transversion, one insertion (codon 194) and one deletion (codon 186). Eight cases had mutations in exon 5, six had mutations in exon 6, two had mutations in exon 7 and one had mutations in exons 8-9. In 14 of 25 cases, gene p53 protein was positive. when immunohistochemical expression of gene p53 protein was positive in more than 20% of cells, there was a high correlation between genetic alterations and immunohistochemical expression of the protein, with a specificity, sensitivity, positive and negative predictive values over 80%. Conclusions: P53 gene mutation is observed in a high proportion of gallbladder cancers at it can be accurately detected with conventional immunohistochemical techniques. The importance of this gene in the genesis of this carcinoma should be determined studying preneoplastic lesions and early carcinomas.

Más información

Título según WOS: P53 Gene mutation in gallbladder cancer
Título de la Revista: REVISTA MEDICA DE CHILE
Volumen: 128
Número: 3
Editorial: SOC MEDICA SANTIAGO
Fecha de publicación: 2000
Página de inicio: 251
Página final: 258
Idioma: Spanish
Notas: ISI