Characteristics and Prognostic Significance of Preoperative Magnetic Resonance Imaging-Assessed Circumferential Margin in Rectal Cancer

Table 1

The relationship between mrCRM status and clinicopathological characteristics.

	Frequency		mrCRM status				value
			Clear mrCRM		Involved mrCRM
	Number	%	Number	%	Number	%
Total	—	—	171	84.2	32	15.8
Age, years
65	113	55.7	94	83.2	19	16.8	0.645
65	90	44.3	77	85.6	13	14.4
Sex
Male	104	51.2	87	83.7	17	16.3	0.815
Female	99	48.8	84	84.8	15	15.2
Preoperative CEA
5 ng/L	147	72.4	124	84.4	23	15.6	0.941
5 ng/L	56	27.6	47	83.9	9	16.1
mrT classification
mrT1-2	30	14.8	30	100	0	0	0.01
mrT3	173	85.2	141	81.5	32	18.5
mrN classification
mrN(−)	114	56.2	102	89.5	12	10.5	0.02
mrN(+)	89	43.8	69	77.5	20	22.5
Location of closest mrCRM in bowel wall
Anterior	107	52.7	83	77.6	24	22.4	0.023
Lateral	84	41.4	77	91.7	7	8.3
Posterior	12	5.9	11	91.7	1	8.3
Peritoneal reflex relationship
Above	39	19.2	35	89.7	4	10.3	0.294
Below	164	80.8	136	82.9	28	17.1
Tumor distance from anal verge
5 cm	85	41.9	78	91.8	7	8.2	0.012
5 cm	11.8	58.1	93	78.8	25	21.2
pT classification
pT1-2	60	29.6	58	96.7	2	3.3	0.002
pT3-4	143	70.4	113	79.0	30	21.0
pN classification
pN0	113	55.7	106	93.8	7	6.2	0.0001
pN1-2	90	44.3	65	72.2	25	27.8
TNM stage
Stage I	48	23.6	46	95.8	2	4.2	0.0001
Stage II	65	32.0	60	92.3	5	7.7
Stage III	90	44.3	65	72.2	25	27.8
pCRM status
pCRM(−)	189	93.1	164	86.8	25	13.2	0.0002
pCRM(+)	14	6.9	7	50.0	7	50.0
Tumor grade
Low-medium	170	83.7	146	85.9	24	14.1	0.144
High	33	16.3	25	75.8	8	24.2

mrCRM, MRI-assessed circumferential margin; CEA, carcinoembryonic antigen; pCRM, pathological circumferential margin.