Fig. 3

Kaplan–Meier survival curves for 1601 patients with curatively resected non-small cell lung cancer. a Group 1 (patients with the blood type O or B) had significantly prolonged overall survival compared with group 2 (patients with the blood type A or AB). b Group 1 had significantly prolonged disease-free survival compared with group 2. c Group 1 had significantly prolonged locoregional relapse-free survival compared with group 2. d No significant difference was observed for distant metastasis-free survival between groups 1 and 2