The AgNoR count in ulcerative colitis with and without dysplasia

Area of Science:

• Gastroenterology
• Oncology
• Pathology

Background:

• Inflammatory Bowel Disease (IBD), specifically ulcerative colitis (UC), poses diagnostic challenges, particularly in distinguishing dysplasia from inflammation.
• Accurate classification of UC and its associated dysplastic changes is crucial for patient management and prognosis.

Purpose of the Study:

• To investigate the utility of nucleolar organizer region (NOR) silver precipitates (AgNORs) in classifying ulcerative colitis (UC) with and without dysplasia.
• To compare AgNOR counts in UC with varying degrees of dysplasia, active vs. inactive disease, colonic adenocarcinomas, and normal colonic mucosa.

Main Methods:

• A quantitative analysis using the one-step silver staining AgNOR technique was performed on 134 colonoscopic biopsy specimens from UC patients.
• Specimens included UC without dysplasia, UC with dysplasia, active and inactive disease, 40 colonic adenocarcinomas, and 22 normal colonic mucosae.

Main Results:

• A highly significant difference in mean AgNOR number was observed between UC without dysplasia and UC with dysplasia (P < 0.001).
• AgNOR counts also showed significant differences between active and inactive UC.
• However, AgNOR counts could not differentiate colonic adenocarcinomas from UC with dysplasia (high, low, or indefinite grade).

Conclusions:

• Quantitative AgNOR evaluation offers a valuable adjunct to morphological criteria for assessing epithelial changes in UC patients.
• This method may aid in establishing clinical management strategies for colitis patients by helping to identify dysplastic changes.