Table 2.

Results of postoperative surveillance

	Stapled n = 24	Hand-sewn n = 29	P value
Median follow-up period after surgery, months (range)	198.7 (13–447.8)	149.0 (7.9–539.5)	0.163
Follow up status			0.017
End of follow-up*, cases (%)	1 (4.2)	4 (13.8)
Lost to follow-up, cases (%)	3 (12.5)	5 (17.2)
Followed up, cases (%)	11 (45.8)	19 (65.5)
Dead, cases (%)	9 (37.5)	1 (3.4)
Temporary drop-out from surveillance, cases (%)	2 (8.3)	2 (6.9)	1.000
Adenoma in the remnant rectum or ATZ, cases (%)	11 (45.8)	3 (10.3)	0.005
FAP-related malignancies
Metachronous remnant rectal cancer, cases (%)	7 (29.2)	0 (0)	0.002
Gastric cancer, cases (%)	4 (16.7)	1 (4.2)	0.164
Duodenal cancer, cases (%)	2 (8.3)	2 (6.9)	1.000
Thyroid cancer, cases (%)	0 (0)	1 (4.2)	1.000
Pouch cancer, cases (%)	0 (0)	2 (6.9)	0.495
Desmoid tumor, cases (%)	6 (25)	8 (17.6)	1.000
Malignancies not related to FAP
Lung cancer	0 (0)	2 (6.9)	0.495
Uterine cancer	1 (4.2)	0 (0)	0.453
Cause of death, cases (%)
FAP-related malignancies, cases (%)	6 (25)	1 (3.4)	0.038
Metachronous rectal cancer, cases (%)	4 (16.7)	0 (0)	0.036
Preoperative colorectal cancer, cases (%)	1 (4.2)	1 (3.4)	1.000
Others, cases (%)	3 (12.5)	0 (0)	0.106

ATZ anal transitional zone, FAP familial adenomatous polyposis

*Patients who are over 75 years of age or wish to end surveillance