Comparison of Targeted vs Random Biopsies for Surveillance of Ulcerative Colitis-Associated Colorectal Cancer

Area of Science:

• Gastroenterology
• Oncology
• Medical Diagnostics

Background:

• Ulcerative colitis (UC) surveillance often uses random biopsies for colorectal cancer detection.
• Targeted biopsies may offer improved efficacy in identifying neoplasia.
• A randomized controlled trial was conducted to compare these methods.

Purpose of the Study:

• To compare the neoplasia detection rates between targeted and random biopsies in patients with ulcerative colitis.
• To evaluate the cost-effectiveness of each biopsy method for UC-associated colorectal cancer surveillance.

Main Methods:

• A randomized controlled trial involving 246 patients with UC (7+ years) across 52 institutions.
• Patients were assigned to either a random biopsy group (4 random biopsies every 10 cm plus targeted) or a target group (only targeted biopsies).
• Primary endpoint: number of neoplastic lesions detected per surveillance colonoscopy.

Main Results:

• Neoplasia detection rates were similar: 11.4% in the target group vs. 9.3% in the random group (P=.617).
• The mean number of neoplastic lesions per colonoscopy was comparable, with targeted biopsies showing a ratio of 1.251 (95% CI, 0.679-2.306).
• Random biopsies yielded significantly more samples and longer examination times, with no neoplasia found in non-inflamed areas.

Conclusions:

• Targeted and random biopsies demonstrate comparable neoplasia detection rates in UC patients.
• Targeted biopsy emerges as a more cost-effective surveillance strategy.
• Random biopsies from non-inflamed mucosa did not yield neoplastic tissue.