Fig 1.
Classification of lymph node groups based on anatomical location.
Lesser curvature (LC) group (station number 1, 3, and 5, according to Japanese classification), greater curvature (GC) group (station number 2, 4sa, 4sb, 4d, 6), and extra-perigastric (EP) group.
Table 1.
Patient demographics and characteristics of gastric cancer.
Table 2.
Number of metastatic lymph nodes for each combination of the three status-based groups.
Fig 2.
Overall survival for new N stages.
A) patient survival among each combination of status-based lymph node groups, B) patient survival for each new N stage at pN1 (number of metastatic lymph nodes: 1–2), C) patient survival for each new N stage at pN2 (number of metastatic lymph nodes: 3–6), D) patient survival for each new N new stage at pN3 (number of metastatic lymph nodes ≥ 7). LC, lesser-curvature group; GC, greater-curvature group; EP; extra-perigastric group.
Table 3.
Patient distributions for the TNM 7th edition and new staging system.
Table 4.
Hazard ratios from Cox proportional hazard model and mean survival rates for the TNM 7th edition and the new staging system.
Table 5.
The prognostic performance of each staging system (Harrell C-index) at each center.
Fig 3.
Kaplan-Meier curves for overall survival of each staging system.
A) TNM 7th edition system with substages in Yonsei set, B) new TNM staging system with substages in Yonsei set, C) TNM 7th edition system with substages in NCC set, D) new TNM staging system with substages in NCC set, E) TNM 7th edition system with substages in TU set, F) new TNM staging system with substages in TU set. NCC, National Cancer Center in Japan; TU, Tokyo University Hospital in Japan.