Long-term efficacy and short-term outcomes of intersphincteric resection vs abdominoperineal resection in patients with ultra-low rectal cancer

Table 2 Comparison of distant metastatic sites between the abdomen perineal resection and intersphincteric resection groups, n (%)

Metastatic site	APR group (n = 289)	ISR group (n = 289)	Total (n = 578)	P value
Total distant	66 (22.8)	52 (18.0)	118 (20.4)	0.149
Lung	33 (11.4)	28 (9.7)	61 (10.6)	0.498
Liver	15 (5.2)	14 (4.8)	29 (5.0)	0.849
Bone	12 (4.2)	13 (4.5)	25 (4.3)	0.838
Pelvis	15 (5.2)	7 (2.4)	22 (3.8)	0.082
Abdominal cavity	15 (5.2)	6 (2.1)	21 (3.6)	0.045
Lateral lymph nodes	14 (4.8)	5 (1.7)	19 (3.3)	0.036
Retroperitoneal	13 (4.5)	2 (0.7)	15 (2.6)	0.004
Brain	2 (0.7)	6 (2.1)	8 (1.4)	0.286
Inguinal	4 (1.4)	0 (0.0)	4 (0.7)	0.124
Perineum area	3 (1.0)	0 (0.0)	3 (0.2)	1.000
Adrenal	1 (0.3)	0 (0.0)	3 (0.5)	0.559
Not common sites1	14 (4.8)	7 (2.4)	21 (3.6)	0.120

¹Includes bladder, uterus, penis, prostate, presacral, other unknown sites.

APR: Abdomen perineal resection; ISR: Intersphincteric resection.