Cumulative Incidence of Permanent Stoma After Sphincter Preserving Low Anterior Resection of Mid and Low Rectal Cancer

BACKGROUND: Changes in the treatment of rectal cancer during the past decades have led to an increase in sphincter preservation with a consecutive decline in abdominoperineal resection rates. OBJECTIVE: The aim of this study was to analyze the cumulative incidence of permanent stoma in patients undergoing sphincter-preserving resection of mid and low rectal cancer. DESIGN: This study is a retrospective analysis of prospectively collected data. SETTINGS: This study was conducted at a tertiary referral cancer hospital. PATIENTS: From 2003 to 2010, 125 patients with primary mid and low rectal cancer who underwent sphincter-preserving low anterior resection were included. MAIN OUTCOME MEASURES: The occurrence of a permanent stoma over time was investigated by using a Cox proportional hazards regression model and competing-risk models, with death as a competing risk. The risk factors were assessed by computing HRs and a Cox proportional hazards regression. RESULTS: After a median follow-up time of 61 months (range, 22-113), 15 of 125 patients ended up with a permanent stoma, accounting for a 5-year cumulative incidence of 6% (95% CI, 4%-11%). The reasons for obtaining a permanent stoma were anastomotic leakage (60%, 9/15), intractable fecal incontinence (27%, 4/15), and local recurrence (13%, 2/15). The Cox proportional hazards regression identified anastomotic leakage (HR, 6.10; 95% CI, 2.23-16.71; p = 0.0004) and coloanal anastomosis (HR, 4.31; 95% CI, 1.49-12.47; p = 0.007) as statistically significant risk factors. LIMITATIONS: Because of the small number of events in this sample, further investigations with a larger number of patients are required. Fecal incontinence was assessed by patient self-reported data without the use of a validated score. CONCLUSION: The 5-year cumulative incidence of a permanent stoma was 6%. Anastomotic leakage and coloanal anastomosis were identified as risk factors. These details should be considered before sphincter-preserving surgery.