XRCC1 and head and neck cancer: Sturgis et al. [34] reported an OR of 1.6 (95% CI, 1.0–2.6) for the XRCC1 codon 399 Gln/Gln genotype in a case-control study of head and neck cancer, and Divine et al. [35] observed an odds ratio of 2.8 (95% CI, 1.2–7.9) for XRCC1 codon 399 Gln/Gln genotype in a case-control study of lung cancer.