Stage

Description

Primary tumor

TX

T0

T1

T2

T3

T4

Not classifiable.

No evidence of primary tumor.

Tumor invades lamina propria or submucosa and tumor size ≤ 1 cm.

Tumor invades muscularis propria or tumor size > 1 cm.

Tumor invades muscularis propria and subserosa, no invasion of serosa.

Tumor invades visceral peritoneum (serosa) or invades other organs.

Lymph nodes

NX

N0

N1

N2

Regional lymph node involvement cannot be assessed.

No regional lymph node involvement.

Regional lymph node involvement <12 nodes.

Large mesenteric tumor (>2 cm) and/or ≥ 12 nodal deposits (especially those encasing the superior mesenteric vessels).

Metastasis

M0

M1

M1a

M1b

M1c

No distant metastasis.

Distant metastasis.

Metastasis confined to liver.

Metastasis in at least one extrahepatic site.

Hepatic and extrahepatic metastases.

Stage

I

II

III

IV

T1, N0, M0.

T2/T3, N0, M0.

T4, N0, M0.

Any T, N1/N2, M0.

Any T, any N, M1.

Tm

Multiple tumors.