Cancer surveillance after ureterosigmoidostomy: colonic microscopic changes

Area of Science:

• Gastroenterology
• Oncology
• Urology

Background:

• Ureterosigmoidostomy (U-S) diverts urine into the sigmoid colon.
• This procedure significantly elevates the risk of colonic carcinoma near ureteral entry sites.
• Surveillance for colonic carcinoma in U-S patients is crucial.

Purpose of the Study:

• To investigate the role of mucosal mucin changes in the sigmoid colon of U-S patients.
• To determine if histological examination of unremarkable mucosa can aid in early colonic carcinoma detection.

Main Methods:

• Colonoscopic examination up to 60 cm in U-S patients.
• Random biopsies of the sigmoid colon distal to ureteral orifices.
• Histological analysis of mucosal mucin composition (sulphomucin and sialomucin).
• Evaluation of mucosal changes after diverting the urinary stream.

Main Results:

• Eight U-S patients showed a shift from sulphomucin to sialomucin in histologically unremarkable mucosa.
• In two patients, diverting urine from the U-S site restored sulphomucin composition.
• These mucin alterations appear to be a non-specific response to urine and feces admixture.

Conclusions:

• While U-S patients require regular colonic cancer surveillance, examining unremarkable sigmoid colon mucosa for mucin changes is not currently a useful diagnostic tool.
• The observed mucin changes do not reliably predict or aid in the early detection of colonic carcinoma in this cohort.