Genetic Polymorphism Contributes to 131 I Radiotherapy-Induced Toxicities in Patients with Differentiated Thyroid Cancer

Aim: To investigate the association between SNPs in DNA damage response pathways and toxicities following 131I radiotherapy of differentiated thyroid cancer (DTC). Materials & methods: We identified 22 functional SNPs of genes in DNA damage response pathways. MassArray was used to sequence SNP genotypes in 203 DTC patients. Hardy–Weinberg equilibrium and the associations between the two alleles of each SNP and toxicity reactions were evaluated using χ2 analysis. Results: Ataxia-telangiectasia mutated (ATM) rs620815 T-allele carriers were at increased risk of 131I radiation-induced gastrointestinal reaction compared with C allele carriers. TNFα rs1800629 GA genotype may increase the incidence of neck pain compared with GG genotype. Furthermore, TNFα rs1800629, ATM rs11212570, NF-κβ rs230493, and TGF-β rs1800469, rs2241716 were associated with throat pain following 131I radiotherapy. Conclusion: The identified SNPs might serve as novel biomarkers for DTC treated with 131I radiotherapy.