A study of a Chinese ethnic population evaluated the association of SNPs in the 3′-UTR double-strand break repair genes RAD51, RAD51B, BRCA1 (rs12516, rs8176318), BRCA2 (rs15869), XRCC4, and XRCC5 with the risk of thyroid cancer in 206 patients with PTC [48]. This evidence concerns the gene XRCC4 and thyroid cancer.