Patients' preferences for sphincter preservation versus abdominoperineal resection for low rectal cancer.

Background: Surgery for low rectal cancer can be associated with severe bowel dysfunction and impaired quality of life. It is important to determine how patients value the trade-off between anorectal dysfunction versus abdominoperineal resection. Therefore, the objective was to determine patients' preferences for treatment for low rectal cancer.
Methods: Ambulatory patients without colorectal cancer at a single high-volume academic colorectal referral center from September 2019 to March 2020 were included. Patients with prior stoma or malignancy were excluded. Participants were presented with a hypothetic scenario describing a low rectal cancer. A threshold task identified preferences for functional and oncologic outcomes for sphincter preservation versus abdominoperineal resection.
Results: A total of 123 patients were recruited. Patients preferred abdominoperineal resection over sphincter preservation if there were more than a mean of 6.7 (standard deviation 4.0) daily bowel movements, 1.9 (standard deviation 2.6) daily episodes of stool incontinence, and 6.5 (standard deviation 3.2) gas incontinence. Abdominoperineal resection was preferred over sphincter preservation in 38% if daily activities were altered owing to fecal urgency. Patients were willing to accept a 10% (interquartile range, 5-25) absolute increase in risk of margin involvement with sphincter preservation to avoid abdominoperineal resection. Abdominoperineal resection was the preferred option overall for 18% of patients.
Conclusion: An important proportion of patients would prefer abdominoperineal resection over sphincter preservation owing to the impairments in anorectal function associated with sphincter preservation. The decision to perform sphincter preservation or abdominoperineal resection should consider how the patients' value functional outcomes with a low anastomosis.
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