The risk of definitive stoma formation at 10 years after low and ultralow anterior resection for rectal cancer.

Aim: The long-term risk of definitive stoma after sphincter-saving resection (SSR) for rectal cancer is underestimated and has never been reported for ultralow conservative surgery. We report the 10-year risk of definitive stoma after SSR for low rectal cancer.

Method: From 1994 to 2008, patients with low rectal cancer who were suitable for SSR were analysed retrospectively. Patients were divided into the following four groups: low colorectal anastomosis (LCRA); coloanal anastomosis (CAA); partial intersphincteric resection (pISR); and total intersphincteric resection (tISR). The end-point was the risk of a definitive stoma according to the type of anastomosis.

Results: During the study period, 297 patients had SSR for low rectal cancer. The incidence of definitive stoma increased from 11% at 1 year to 22% at 10 years. The reasons were no closure of the loop ileostomy (4.7%), anastomotic morbidity (6.5%), anal incontinence (8%) and local recurrence (5.2%). The risk of definitive stoma was not influenced by type of surgery: 26% vs 18% vs 18% vs 19% (P = 0.578) for LCRA, CAA, pISR and tISR, respectively. Independent risk factors for definitive stoma were age > 65 years and surgical morbidity.

Conclusion: The risk of a definitive stoma after SSR increased two-fold between 1 and 10 years after surgery, from 11% to 22%. Ultralow conservative surgery (pISR and tISR) did not increase the risk of definitive stoma compared with conventional CAA or LCRA.