RESUMO
OBJECTIVES: The study explored the association between rs10069690C/T and rs2736100G/T of human telomerase reverse transcriptase (hTERT) gene, and the prognosis of thyroid cancer. METHODS: The study had 452 thyroid cancer patients recruited as case group who hospitalized in Jingzhou Central Hospital from January 2001 to June 2004 and 452 healthy people recruited as control group at the same area. The hTERT gene polymorphisms at rs10069690 C/T and rs2736100 G/T were tested by polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP) method. The association between patients' life quality and hTERT gene polymorphisms six months after surgery was evaluated based on the Cancer patients' quality of life index rating scale. RESULTS: There were statistical differences in genotype and allele frequencies of rs10069690 C/T between the case group and control group (both P < 0.05). An association between rs10069690C/T polymorphism and an increased risk of thyroid cancer was shown by logistic regression analysis (CT vs. CC, OR = 1.333, 95%CI = 1.006-1.766, P = 0.045; TT vs. CC, OR = 1.910, 95%CI = 1.084-3.367, P = 0.023; CT + TT vs. CC, OR = 2.246, 95%CI = 1.078-1.840, P = 0.006; T vs. C, OR = 1.376, 95%CI = 1.104-1.715, P = 0.004). Genotype frequency of rs2736100G/T between the two groups had no statistical differences (P > 0.05). After stratification according to age, T stage, tumor size and tumor node metastasis (TNM) stage, the distribution frequencies of CC genotype and CT + TT genotype of rs10069690C/T showed significant difference (P < 0.05). The life quality of patients with CC genotype was better than that of patients with CT $+$ TT genotype. The results of Cox regression model multifactor analysis showed that age, T stage, tumor size and rs10069690C/T were independent risk factors of thyroid cancer prognosis. CONCLUSIONS: hTERT gene polymorphism at rs10069690C/T is associated with the risk and prognosis of thyroid cancer, but hTERT gene polymorphism at rs2736100G/T is not.
