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The first signs of oral cancer may resemble developing infections in the mucous membranes, with throat cancer symptoms being similar to those of upper respiratory tract infections. This greatly hinders rapid diagnosis and treatment. Better knowledge of the changes occurring in the metabolism of folic acid can help in understanding the carcinogenesis affecting DNA methylation and genome stability. Polymorphisms in genes encoding enzymes involved in this pathway may influence enzyme activity and thereby interfere with the concentrations of homocysteine and S-adenosylmethionine, which are important for DNA synthesis and cellular methylation reactions. The aim of the study was to determine the risk of oral cancer associated with the TC2 C776G polymorphism, as determined in 119 patients. Genotypes were determined by polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP). The test genotype was found to correspond to the Hardy-Weinberg (HW) equilibrium (p &gt; 0.05). In our population G/G homozygosity of C776G TC2 gene polymorphism increases the risk of oral cancer; OR (odds ratio): 4.3875; 95% CI (confidence interval): 2.0518-9.319; p = 0.001. Regarding C/G genotype of the C776G TC2 gene, polymorphism also increases the risk of developing this cancer; OR 2.4146 95% CI: 1.2803-4.5541; p = 0.01.

TC2 C776G polymorphism studies in patients with oral cancer in the Polish population