Fig. 4

Disease-free survival (DFS) after weighting by the Kaplan–Meier method stratified by TNM stage after IPTW. A stage I (5-year DFS rate 85.2% vs. 86.9%, p = 0.97). B stage II (5-year DFS rate 77.6% vs. 80.4%, p = 0.045). C stage III (5-year DFS rate 56.8% vs. 61.9%, p = 0.028) (Fig. 4). DFS, disease-free survival; IPTW, inverse probability of treatment weighting; WBC, white blood cell