Anal Transitional Zone Neoplasia in Patients with Familial Adenomatous Polyposis after Restorative Proctocolectomy and IPAA

Abstract

Restorative proctocolectomy and IPAA in patients with familial adenomatous polyposis may leave residual anal transitional zone mucosa that is prone to neoplasia. The aim of this study was to evaluate the long-term control of neoplasia at the IPAA, the functional outcomes, and the influence of anastomotic technique on these results. : This research is a retrospective cohort study from a prospective database. The investigation took place in a high-volume specialized colorectal surgery department. Patients with familial adenomatous polyposis who underwent IPAA between 1983 and 2010 were included. The primary outcomes measured were functional outcomes, quality of life, and the incidence of neoplasia in the anal transitional zone. Eighty-six patients underwent mucosectomy and 174 underwent stapled anastomosis with mean 155 ± 99 and 95 ± 70 months follow-up. Eighteen patients (20.9%) in the mucosectomy group and 59 patients (33.9%) in the stapled group developed anal transitional zone adenomas (p = 0.03). One of 86 (1.2%) patients undergoing mucosectomy and 3 of 174 (1.7%) patients undergoing stapled anastomosis developed cancer in the anal transitional zone (p > 0.05). Three of these patients underwent an abdominoperineal resection, but one who refused abdominoperineal resection underwent transanal excision with neoileoanal anastomosis. Patients undergoing a mucosectomy had a significantly higher rate of anastomotic stricture, but other complications were similar. Incontinence, seepage, and pad usage were higher in the mucosectomy group. Cleveland global quality-of-life score was 0.8 ± 0.2 in patients with handsewn anastomoses and 0.8 ± 0.3 in patients with a stapled anastomoses (p > 0.05). This study was limited by its nonrandomized retrospective design. Risk for the development of adenomas in the anal transitional zone is higher after a stapled IPAA than after a mucosectomy with handsewn anastomosis. However, control of anal transitional zone neoplasia results in a similar risk of cancer development. Because the stapled procedure is associated with better long-term functional outcomes than a mucosectomy, stapled IPAA is the preferable procedure for most patients with familial adenomatous polyposis.