Table 1

Patient characteristics of eight patients in whom serrated adenomas were identified in St Mark’s polyposis registry

Patient No (sex)	Age at colectomy (y)	Preoperative endoscopy	Colectomy specimen polyp count	Site and size of serrated adenoma	APC mutation analysis
FAP, familial adenomatous polyposis.
1 Male	29	Not available	3550	Sigmoid colon 1.2 cm (colectomy)	Ex 15 4175 c >g
2 Female	36	Classical FAP	1230	Descending colon 0.5 cm (colectomy	Under investigation
3 Male	19	Low polyp count	Not available	Rectum 0.5 cm (colectomy)	Unsuccessful
4 Female	39	Classical FAP	900	Rectal polyp (surgical excision)	Unsuccessful
5 Female	17	Classical FAP	648	Descending colon (colectomy)	Ex 15 2367-2368 deletion
6 Male	19	Low polyp count	868	Rectal biopsy	Unsuccessful
7 Male	19	Classical FAP	Hundreds	Rectal biopsy	Ex 15 3254-3257 del
8 Female	14	Not available	1425	Colectomy specimen	Unsuccessful