Figure 3.

Survival analyses according to AJCC 7^th and AJCC 8^th TNM staging systems. A: AJCC 8^th TNM staging system (4 subgroups). The AJCC 8^th staging system was the same as AJCC 7^th staging system when classified into four major stages. B: AJCC 7^th TNM staging system (8 subgroups). C: AJCC 8^th TNM staging system (8 subgroups). D: Survival comparison of stage IIIC and IV in AJCC 8^th staging system. T4N3bM0 and T4bN3aM0 were compared with stage IV of AJCC 8^th staging system. Detailed subgroup analysis was shown at the lower right corner of each part. P-value in bold red indicated that the survival rate of the subgroup was significantly different.