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

Table 2 Relationship between “T-downstaging” and prognostic parameters

Feature	Group R (n = 11)	Group NR (n = 29)	P
Median age (range) (mean ± SD) (yr)	70 (55-77) (67.7 ± 7.2)	61 (45-70) (59.4 ± 9.9)	< 0.05
Tumor stage			< 0.000
ypT0	1 (9.1%)	0
ypT1	4 (36.4%)	0
ypT2	6 (54.6%)	0
ypT3	0	29 (100.0%)
TRG			< 0.08
1	1 (9.1%)	0
2	2 (18.2%)	1 (3.5%)
3	6 (54.6%)	11 (37.9%)
4	2 (18.2%)	14 (48.3%)
5	0	3 (10.3%)
NG			< 0.08
1	5 (45.5%)	4 (13.8%)
2	2 (18.2%)	4 (13.8%)
3	4 (36.4%)	21 (72.4%)