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Pavicic, Walter H; Laguens, Martin; Richard, Silvina M
Molecular medicine, 05/2009, Letnik: 15, Številka: 5-6Journal Article
The aim of this study was to determine the existence of association between the genetic polymorphisms of metabolizing genes GSTM-1, GSTT-1, and NAT-2, and the presence of mitochondrial genome instability (mtGI) in breast cancer cases. Ninety-four pairs of tumoral/nontumoral breast cancer samples were analyzed. Our samples showed 40.42% of mtGI by analysis of two D-loop region markers, a (CA)n mtMS starting at the 514-bp position, and four informative MnlI sites between the 16,108-16,420-bp. GSTM-1 null genotype has shown a significant association with mtGI presence (chi(2) = 7.62; P = 0.006) in breast cancer cases; moreover, these genotypes also are related to an increased risk for mtDNA damage (odds ratio OR = 3.71 1.41-9.88; 95% Cornfield confidence interval CI). These results suggest that the absence of GSTM-1 enzymatic activity favors chemical actions in damaging the mtDNA. Analysis of GSTT-1 and NAT-2 polymorphisms showed no association with mtGI (chi(2) = 0.03; P = 0.87 and chi(2) = 2.76; P = 0.09, respectively). The analysis of invasive breast cancer cases showed mtGI in 74.36% of ILC cases (29 of 39 samples), and in only 18.75% (9 out of 48) IDC cases; this result suggests a possible relation between mtDNA mutations and variations in molecular pathways of tumor development.
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