Figure 2. Disease-free survival curves of all patients (n = 331). The 5-year disease-free survival rate was 71.6% (95% confidence interval [CI], 61.9%–79.2%) for blood group O, 62.3% (95% CI, 53.5%–69.8%) for blood group A, 68.8% (95% CI, 55.2%–79.1%) for blood group B, and 65.3% (95% CI, 44%–80.2%) for blood group AB.