Stratifying the risk of lymph node metastasis in undifferentiated-type early gastric cancer

Figure 2 Decision tree analysis. A: Preoperatively evaluable factors. Based on nine factors of age, gender, location, size, form, ulcer, depth, histology, and mixed-type, 567 cases were classified into five subgroups. Boxes indicate the factors used for splitting with cut-off points. Pie charts indicate the rate of lymph node metastasis in each group. Numbers show the rate of lymph node metastasis with 95%CI; B: Postoperatively evaluable factors. Based on 11 factors of age, gender, location, size, form, ulcer, depth, histology, mixed-type, lymphatic involvement, venous involvement, and lymph node metastasis, 567 cases were classified into four subgroups on the decision tree. Boxes indicate the factors used for splitting with cut-off points. Pie charts indicate the rate of lymph node metastasis in each group. Numbers shows the rate of lymph node metastasis with 95%CI. LNM: Lymph node metastasis; M/U: Middle/upper third of the stomach; L: Lower third of the stomach; LI: Lymphatic involvement.