OGG1 and gastric cancer: In subgroup analyses by cancer types, we found that the hOGG1 Ser326Cys polymorphism was significantly associated with lung cancer (Cys/Cys vs. Ser/Ser: OR = 1.29, 95%CI = 1.16–1.44, P<0.001; Cys/Cys vs. Cys/ Ser+Ser/Ser: OR = 1.22, 95%CI = 1.12–1.33, P<0.001; Table S2, Figure 2), but not with colorectal, breast, bladder, prostate, and gastric cancer.