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

Table 4 Relationship between tumor stage and NG

	NG 1	NG 2	NG 3
Local tumor stage1b
ypT0	1	-	-
ypT1	3	1	-
ypT2	1	1	4
ypT3	4	4	21
Lymph node involvement2a
ypN0	9	5	12
ypN1	-	-	8
ypN2	-	1	5

¹Spearman R correlation r = 0.42;

^bP < 0.01, comparison between different local tumor stages.

²Spearman R correlation r = 0.45;

^aP < 0.005, comparison of lymph node involvement.