Primary tumor (T)
TX: Primary tumor cannot be assessed
T0: No evidence of primary tumor
Tis: Carcinoma in situ: intraepithelial tumor without invasion of the lamina propria
T1: Tumor invades lamina propria or submucosa
T2: Tumor invades the muscularis propria or the subserosa*
	T2a: Tumor invades muscularis propria
	T2b: Tumor invades subserosa
T3: Tumor penetrates the serosa (visceral peritoneum) without invading adjacent structures†‡
T4: Tumor invades adjacent structures†‡
Regional lymph nodes (N)
NX: Regional lymph node(s) cannot be assessed
N0: No regional lymph node metastasis§
N1: Metastasis in 1 to 6 regional lymph nodes
N2: Metastasis in 7 to 15 regional lymph nodes
N3: Metastasis in more than 15 regional lymph nodes
Distant metastasis (M)
MX: Distant metastasis cannot be assessed
M0: No distant metastasis
M1: Distant metastasis