Clinical features and long-term outcomes of patients with colonic oligopolyposis of unknown etiology

Table 5 Extra colonic malignancies in the colonic adenomatous polyposis of unknown etiology cohort

Type of malignancy	Number	%	Incidence rate (Per 1000 person-years)
Non-melanoma skin cancer	25	51	5.1
Prostate	6	12.2	1.2
Melanoma	5	10.2	1
Breast	4	8.2	0.8
Lung	2	4.1	0.4
Uterine	1	2	0.2
Non-Hodgkin's Lymphoma	1	2	0.2
Gallbladder	1	2	0.2
Ovary	1	2	0.2
Bladder	1	2	0.2
Pancreas	1	2	0.2
Merkel cell tumor	1	2	0.2

35 patients reported an extra-colonic malignancy. Highest frequencies were noted for Non-melanoma skin cancer (51%), Prostate (12.2%) and Melanoma (10.2%)