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Published on: April 28, 2021
Malignant biliary stenosis: conventional cytology versus DNA image cytometry
Janek Binek1, Nadja Lindenmann, Christa M Meyenberger
1Gastroenterology Unit, Department of Internal Medicine, Kantonsspital, 9007, St. Gallen, Switzerland. janek.binek@kssg.ch
Image cytometry (ICM)-DNA analysis on biliary brush specimens did not significantly improve diagnostic accuracy for neoplasias compared to conventional cytology (CC). However, combining both methods enhanced specificity, showing clinical utility in diagnosing biliary tract dysplasia or cancer without false positives.
Area of Science:
- Gastroenterology
- Oncology
- Cytopathology
Background:
- Biliary neoplasias pose diagnostic challenges.
- Accurate diagnosis is crucial for timely treatment and improved patient outcomes.
- Cytological brush specimens are commonly used for biliary tract sampling.
Purpose of the Study:
- To evaluate the diagnostic utility of image cytometry (ICM)-DNA analysis in biliary brush specimens.
- To compare the sensitivity, specificity, and predictive values of ICM-DNA analysis against conventional cytology (CC) for biliary neoplasias.
- To assess the combined diagnostic performance of ICM-DNA and CC.
Main Methods:
- A prospective study included 71 patients with 89 biliary tree brushing samples from stenoses.
- Conventional cytology (CC) and ICM-DNA ploidy analysis were performed on the samples.
- Diagnosis confirmation was achieved through surgical exploration or a minimum 12-month clinical follow-up.
Main Results:
- Conventional cytology (CC) showed a sensitivity of 0.666 and specificity of 0.920.
- ICM-DNA analysis yielded a sensitivity of 0.658 and specificity of 0.937.
- The positive predictive value (PPV) was 0.866 for CC and 0.900 for ICM-DNA.
- Agreement between CC and ICM-DNA in 73 samples raised specificity to 0.998 but not sensitivity (0.725).
Conclusions:
- ICM-DNA analysis did not significantly enhance the positive predictive value (PPV) or negative predictive value (NPV) for detecting biliary tract neoplasias compared to CC.
- A clinical advantage was observed in the agreement between CC and ICM-DNA, particularly in diagnosing dysplasia or cancer, as it avoided false positive results.
