XRCC3 and lung cancer: The frequency of the 241Met/Met genotype in XRCC3 was similar in the study cases (12.4%) and in controls (13.8%), and no association was found between XRCC3 Thr241Met polymorphism and lung cancer risk (adjusted OR = 0.92; 95% CI = 0.56–1.50, P = 0.898) (Table 4).