Evaluation of the potential use of GSTP1, GSTO1 and p53 genotype profiles as markers of thyroid cancer predisposition and response to treatment / Avaliação do potencial de uso dos perfis genotipicos de GSTP1, GSTO1 e P53 como marcadores de presiposição ao cancer da tireoide e como preditores de resposta ao tratamento

AUTOR(ES)

Fabiana Granja

DATA DE PUBLICAÇÃO

2005

RESUMO

The development of screening tools designed to identify individuals at risk for thyroid odule cancer is of utmost necessity. The aim of the present research is to evaluate the utility of GSTP1, GSTO1 and p53 genotype profiles as markers of risk to thyroid cancer and its response to treatment. We compared peripheral blood samples from 157 controls to 144 patients with thyroid nodules: 44 benign (30 hyperplasias and 14 folicular adenomas - AF) and 98 malignant (77 papillary carcinomas - PC and 21 folicular carcinomas - FC). All patients were managed according to a standard protocol. Thyroid carcinoma patients presented more frequently GSTP1 (cancer = 27.5% versus controls = 5.7% - p<0.0001) and codon 72 of p53 (cancer =12.2% versus controls =2% - p<0.001) polymorphisms than the control population. There was no difference between cancer and controls regarding GSTO gene. These variant genotypes increased the risk for thyroid câncer more than 7 times for GSTP1 (Odds ratio= 7.415; 95% CI: 2.472-22.243) and codon 72 of p53 (Odds ratio=7.023; 95% CI: 1.928-25.588). GSTP1 and codon 72 p53 polymorphisms identify thyroid câncer with a sensitivity of 75% and 80% and specificity of 68% and 63%, respectively. Logistic regression analysis adjusted for gender, age and color demonstrated that GSTP1 and p53, but not GSTO1 polymorphisms are independent factors of risk for malignancy. There was no correlation between any genetic profile and the response to treatment or the outcome of cancer patients. Our data indicates that the use of these molecular markers, together with the classic clinico-epidemiologic features associated to thyroid cancer susceptibility may be useful in screening thyroid nodules malignancy in Brazilian population

ASSUNTO(S)

genotipo genes p53 predisposição genetica para doenças bocio cancer polimorfismo (genetica) tireoide - tumores

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