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Role of GSTM1 and GSTT1 genotypes in differentiated thyroid cancer and interaction with lifestyle factors: Results from case- control studies in France and New Caledonia

Abstract : BACKGROUND: GSTM1 and GSTT1 are involved in detoxification of xenobiotics, products of oxidative stress and in steroid hormones metabolism. We investigated whether GSTM1 and GSTT1 gene deletion was associated with DTC risk and explored interaction with non-genetic risk factors of DTC. METHODS: The study included 661 DTC cases and 736 controls from two case-control studies conducted in France and New Caledonia. Odds ratios (OR) and their confidence interval (CI) for DTC associated with GST genotypes, alcohol drinking, tobacco smoking, body mass index and hormonal factors were calculated using logistic regression models. RESULTS: Results are presented for Europeans and Melanesians combined, as no heterogeneity between groups was detected. We found that DTC risk increased with obesity and decrease with alcohol drinking. After stratification by gene deletion status, the OR for obesity was 5.75, (95%CI 2.25-14.7) among individuals with GSTT1 and GSTM1-deleted genotype, and 1.26, (95%CI 0.89-1.77) in carriers of both genes (p-interaction = 0.02). The OR for drinking ≥1 glass/week was 0.33 (95%CI 0.15-0.74) in GSTT1-null individuals while it was 1.01 (95%CI 0.67-1.52) in non-null carriers of the gene (p-interaction = 0.01). No interaction between GST genotypes and other non-genetic risk factors was detected. CONCLUSION: GSTM1 and GSTT1 genotypes may modulate the DTC risk associated with BMI and alcohol consumption.
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Catherine Tcheandjieu, Emilie Cordina-Duverger, Claire Mulot, Dominique Baron-Dubourdieu, Anne-Valérie Guizard, et al.. Role of GSTM1 and GSTT1 genotypes in differentiated thyroid cancer and interaction with lifestyle factors: Results from case- control studies in France and New Caledonia. PLoS ONE, Public Library of Science, 2020, 15 (1), pp.e0228187. ⟨10.1371/journal.pone.0228187⟩. ⟨inserm-02468903⟩

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