Table 2.

Surgery and histopathologic parameters

Characteristic	3D conformal radiotherapy		Volumetric modulated arc therapy		p
	No.	%	No.	%
OP-method
Low anterior resection	68	64	55	68	0.5356
Abdominoperineal resection	39	36	26	32
Distance from anal verge 0 to <6 cm, sphincter-saving surgery
Yes	9	23	11	31	0.3830
No	31	77	24	69
R-status
0	104	97	79	98	0.5330
1	1	1	2	2
2	1	1	0	0
X	1	1	0	0
ypT-stage
0	14	13	16	20	0.1397
1	11	10	5	6
2	34	32	25	31
3	42	39	35	43
4	6	6	0	0
ypN-stage
0	69	65	57	70	0.5492
1	27	25	15	19
2	11	10	9	11
Tumor regression grading
0 no regression	0	0	1	1	0.1727
1 minor regression	12	11	9	11
2 moderate regression	34	32	32	40
3 good regression	47	44	23	28
4 total regression	14	13	16	20

The Chi-Square test and the Krusal-Wallis test were used for group comparisons

Abbreviations: R-status resection status, ypT tumor stage after preoperative radiochemotherapy, ypN nodal stage after preoperative radiochemotherapy