XRCC1 and gastric cancer: In dominant model, the XRCC1 399 A allele was not associated with high risks of disease progression for gastric cancer patients (G/A + A/A versus G/G: HR, 1.04; 95%CI, 0.49–2.25; I2 = 85%, p = 0.001 for heterogeneity) (Fig. 3).