Hung et al. examined the associations between lung cancer risk and 18 polymorphisms in 12 DNA repair genes, including APEX1, OGG1, XRCC1, XRCC2, XRCC3, ERCC1, XPD, XPF, XPG, XPA, MGMT, and TP53 [55]. This evidence concerns the gene XRCC3 and lung cancer.