Table 2.
T: Primary tumor: |
Tx: It can not be evaluated |
T0: No evidence of primary tumor |
Tis: High-grade dysplasia (intra-epithelial neoplasia noninvasive) |
T1: Tumor invades own lamina, muscularis mucosae and submucosa: |
T1a: Tumor invades own lamina or muscularis mucosae |
T1b: Tumor invades the submucosa |
T2: Tumor invades the muscularis |
T3: Tumor invades the adventitia |
T4: Tumor invades adjacent structures: |
T4a: Tumor invades resectable pleura, pericardium, or diaphragm |
T4b: Unresectable tumor that invades other adjacent structures: aorta, vertebral body, trachea, etc. |
N: Regional lymph nodes: |
Nx: They can not be evaluated |
N1: Metastasis in 1-2 regional lymph nodes |
N2: Metastasis in 3-6 regional lymph nodes |
N3: Metastasis in 7 or more regional lymph nodes |
M: Distant metastasis: |
M0: None |
M1: There are distant metastases |
Modified from AJCC 2010[29].