Thyroid cancer is the most common malignant tumor of the endocrine system, and
its incidence is increasing worldwide each year. This study aimed to explore the
association between XRCC1, GSTM1, and GSTT1 polymorphisms in the model of
thyroid cancer. The experiment was conducted by searching PubMed, Embase, and
Web of Science, with the last search performed in March 2022. A total of 12
studies were included in this meta-analysis, with sample sizes ranging from 211
to 1124. The proportion of XRCC1 polymorphisms (rs25489, GG) in thyroid cancer
was slightly lower than that of the normal control group, but the difference was
not statistically significant (Mean difference=1.13, 95% CI:
0.99–1.28, p=0.08). The proportion of XRCC1 polymorphisms
(rs25489, GA) in thyroid cancer was significantly lower than that of the normal
control group (Mean difference=1.32, 95% CI: 1.16–1.52,
p<0.00001). The proportion of XRCC1 polymorphisms (rs25489, AA) in
thyroid cancer was slightly lower than that of the normal control group, but
again, the difference was not statistically significant (Mean
difference=0.78, 95% CI: 0.61–1.01, p=0.06).
Similarly, the proportion of XRCC1 polymorphisms (rs25487, GG) and (rs25487, GA)
in thyroid cancer was lower than that of the normal control group, but the
differences were not statistically significant (p=0.22 and
p=0.49, respectively). In conclusion, this study found that the
proportion of XRCC1 polymorphisms (rs25489, AA) in thyroid cancer was lower than
that of the normal control group.