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P16 and Ki67 Immunostains Decrease Intra- and Interobserver Variability in the Diagnosis and Grading of Anal
Ann E Walts1, Juan Lechago, Bing Hu
1Department of Pathology and Laboratory Medicine, Cedars-Sinai Medical Center, Los Angeles, CA.
Clinical Medicine. Pathology
|August 31, 2011
Summary
Adding p16 and Ki67 immunostains significantly improves the accuracy of diagnosing anal intraepithelial neoplasia (AIN). This reduces variability among pathologists, aiding in precise AIN grading.
Area of Science:
- Pathology
- Oncology
- Virology
Background:
- HPV-associated anal intraepithelial neoplasia (AIN) diagnosis shows significant variability.
- Previous research linked high p16 and Ki67 positivity to high-grade AIN.
Purpose of the Study:
- To assess if p16 and Ki67 immunostaining reduce diagnostic variability in AIN.
- To improve the accuracy of AIN grading.
Main Methods:
- Three pathologists established consensus diagnoses on 60 anal biopsy slides (25 negative, 12 low-grade, 23 high-grade AIN).
- Three independent pathologists initially diagnosed H&E slides, then re-evaluated them with p16 and Ki67 immunostains.
Main Results:
- Immunostaining reduced both intra- and interobserver variability in AIN diagnosis.
- Concurrence with consensus diagnoses improved, particularly for negative and high-grade AIN.
- Two-step diagnostic differences were reduced with the addition of immunostains.
Conclusions:
- P16 and Ki67 immunostaining are valuable tools for AIN diagnosis and grading.
- These markers enhance diagnostic consistency and accuracy.
