Table 2.

TNM Classification of Colorectal Cancer.

T: Primary tumor	N: Regional lymph node	M: Distant metastasis
Tx: Tumor cannot be assessed	Nx: Nodes cannot be assessed	Mx: Distant metastasis cannot be assessed
T0: No evidence of primary tumor	N0: No node metastasis	M0: No distant metastasis
Tis: Carcinoma in situ	N1: Metastasis in 1-3 nodes	M1: Distant metastasis
T2: Tumor invades muscularis propria	N2: Metastasis in 4 or more nodes
T3: Tumor invades through into subserosa
T4: Tumor directly invades other organs

Abbreviation: TNM, tumor–node–metastasis.