Score	Inflammatory cell infiltration	Depth of invasion	Crypt injury	Pathological range (%)
0	None	None	None	0
1	±	Mucosa layer	1/3	1–25
2	+	Mucosa and submucosa	2/3	26–50
3	+  +	Full	Full	51–75
4	+  +  +	Full	Full	76–100