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Master's Dissertation
DOI
https://doi.org/10.11606/D.5.2008.tde-02042008-134033
Document
Author
Full name
Jeronimo de Alencar Nogueira
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2008
Supervisor
Committee
Nita, Suzane Kioko Ono (President)
Nascimento, Elizabeth de Souza
Pinho, João Renato Rebello
Title in Portuguese
Mutação pontual do códon 249 do TP53 no carcinoma hepatocelular
Keywords in Portuguese
Aflatoxina B1
Carcinoma hepatocelular
Genes p53
Mutação
Abstract in Portuguese
Mutação 249Ser no TP53 no Carcinoma Hepatocelular (CHC), frequente em países da África e Ásia, é uma evidência molecular de exposição à aflatoxina. O objetivo deste estudo é analisar a freqüência de 249Ser em 74 amostras de CHC no Brasil. A mutação foi analisada por RFLP e sequenciamento. A presença de vírus da hepatite B (VHB) foi analisada por PCR em tempo real. 249Ser foi encontrada em 13/74 (28%) e VHB em 13/74 (16%). A mutação foi encontrada em maior freqüência em tumores indiferenciados (OR = 2,415, IC = 1,001 - 5,824). O tamanho médio de tumores com 249Ser foi de 9,4 cm contra 5,5 cm de amostras sem a mutação (p=0,012). Não foi encontrada relação entre VHB e 249Ser. Os resultados indicam que 249Ser é um fator importante na carcinogênese do CHC no Brasil sendo associada à uma forma maior e menos diferenciada de tumor.
Title in English
Mutation of TP53 codon 249 in the hepatocellular carcinoma
Keywords in English
Aflatoxin B1
Genes p53
Hepatocellular Carcinoma
Mutation
Abstract in English
TP53 249Ser mutation has been proved a molecular evidence for aflatoxin-related Hepatocellular Carcinoma (HCC) and is frequent in Africa and Asia. The aim of our study was to analyze the frequency of 249Ser mutation in HCC from Brazil. We studied 74 samples of paraffin embedded HCC. 249Ser mutation was analyzed by RFLP and sequencing. Presence of HBV DNA was determined by Real-Time PCR. 249Ser was found in 21/74 (28%) samples while HBV DNA was found in 13/74 (16%). Poorly differentiated HCC was more likely to have 249Ser mutation (OR = 2.415, IC = 1.001 - 5.824). The mean tumor size of 249Ser HCC was 9.4 cm versus 5.5cm on wild type (p=0.012). HBV DNA was not related with 249Ser. Results indicate that 249Ser is an important factor of HCC carcinogenesis in Brazil and is associated with large and poorly differentiated tumors.
 
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Publishing Date
2008-04-07
 
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