Sensitivity analysis of XPC Lys939Gln polymorphism and CRC risk in the overall populations. This figures show the influence of individual studies on the summary OR. The middle vertical axis indicates the overall OR and the two vertical axes indicate its 95% CI. Every hollow round indicates the pooled OR when the left study is omitted in this meta-analysis. The two ends of every broken line represent the 95% CI. A Glnlys vs. LysLys; B dominant model GlnGln + Glnlys vs. LysLys.