Figure 1. Overall survival curves of all patients (n = 333). The 5-year overall survival rate was 83.6% (95% confidence interval [CI], 75%–89.5%) for blood group O, 68.5% (95% CI, 59.8%–75.6%) for blood group A, 68.8% (95% CI, 55.2%–79.1%) for blood group B, and 69.2% (95% CI, 47.8%–83.3%) for blood group AB. The patients in blood group O showed significantly better survival than the patients in the non-O blood groups (P = 0.016).