Table 2.

Tumour node metastases staging for colorectal cancer study participants

TNM stage	Description	n
Tis N0 M0	Tis: Tumour confined to mucosa; cancer-in-situ	2
T1 N0 M0	T1: Tumour invades submucosa	2
T2 N0 M0	T2: Tumour invades muscularis propria	12
T3 N0 M0	T3: Tumour invades subserosa or beyond (without other organs involved)	16
T4 N0 M0	T4: Tumour invades adjacent organs or perforates the visceral peritoneum	3
T1-2 N1 M0	N1: metastasis to one to three regional lymph nodes. T1 or T2.	3
T3-4 N1 M0	N1: metastasis to one to three regional lymph nodes. T3 or T4.	8
any T, N2 M0	N2: metastasis to four or more regional lymph nodes. Any T.	1
any T, any N, M1	M1: distant metastases present. Any T, any N.	0

TNM, tumour node metastases.