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Published on: January 21, 2019
IMP3 immunocytochemical staining increases sensitivity in the routine cytologic evaluation of biliary brush specimens
Jesse Hart1, Meena Parab, Daniza Mandich
1Department of Pathology and Laboratory Medicine, Hartford Hospital, Hartford, CT 06102-8000, USA. jhart02@harthosp.org
Insights
Combining routine biliary cytology with IMP3 immunocytochemistry significantly improves malignancy detection in biliary strictures. This enhanced diagnostic approach offers superior sensitivity compared to either method alone.
Area of Science:
- Gastroenterology
- Oncology
- Cytopathology
Background:
- Biliary strictures require accurate diagnosis, often challenging with standard methods.
- Biliary brush cytology is a key diagnostic tool for biliary strictures.
Purpose of the Study:
- To evaluate the diagnostic utility of combining routine Papanicolaou-stained cytology with insulin-like growth factor mRNA-binding protein-3 (IMP3) immunocytochemistry for biliary strictures.
- To compare the sensitivity and specificity of routine cytology, IMP3 immunocytochemistry, and their combination in diagnosing malignancy.
Main Methods:
- Retrospective analysis of 64 patients with biliary strictures undergoing ERCP with bile duct brushings.
- Cytologic evaluation using routine Papanicolaou stain and immunocytochemical staining for IMP3.
- Definitive diagnosis confirmed by tissue resection, biopsy, fine needle aspiration, or clinical progression.
Main Results:
- Malignancy was diagnosed in 39 of 64 patients.
- Sensitivity for malignancy detection: routine cytology (33.3%), IMP3 (64.1%), combined (71.8%).
- All methods demonstrated 100% specificity; combined approach yielded the highest sensitivity.
Conclusions:
- IMP3 immunocytochemistry shows superior sensitivity to routine cytology for detecting malignancy in biliary brushings.
- The combination of biliary brushing cytology and IMP3 immunohistochemistry offers a more sensitive diagnostic strategy for biliary strictures than either method individually.
Abstract:
Biliary brush cytology is an important diagnostic tool in the evaluation of biliary strictures. Here, we evaluated 64 patients with biliary strictures who underwent endoscopic retrograde cholangiopancreatography with bile duct brushings. We assessed the utility of combining routine Papanicolaou-stained cytologic evaluation with immunocytochemical expression of insulin-like growth factor mRNA-binding protein-3 (IMP3). Definitive diagnoses were obtained via tissue resection/autopsy, biopsy, fine needle aspiration, or clinical progression of disease. Thirty-nine of the 64 patients were ultimately diagnosed with malignancy. The sensitivity of routine cytology for the detection of malignancy was 33.3%, immunocytochemical-IMP3 expression was 64.1%, and the combined sensitivity was 71.8%. The specificity of each method was 100%. The sensitivity of IMP3 immunocytochemical staining in the detection of malignancy in biliary brushings was superior to routine PAP-stained cytologic evaluation. Moreover, the combined use of biliary brushing cytology and IMP3 immunohistochemistry proved superior to the use of either method alone.
