Usefulness of two independent histopathological classifications of tumor regression in patients with rectal cancer submitted to hyperfractionated pre-operative radiotherapy

Table 3 Relationship between tumor stage and TRG

	TRG 1	TRG 2	TRG 3	TRG 4	TRG 5
Local tumor stage1a
ypT0	1	-	-	-	-
ypT1	-	2	2	-	-
ypT2	-	-	4	2	-
ypT3	-	1	11	14	3
Lymph nodes involvement2c
ypN0	1	3	14	8	-
ypN1	-	-	1	5	2
ypN2	-	-	2	3	1

¹Spearman R correlation r = 0.47;

^aP < 0.005, comparison between different local tumor stages.

²Spearman R correlation r = 0.47;

^cP < 0.005, comparison between different lymph nodes involvements.