Fluorescence in situ hybridisation in the cytological diagnosis of pancreatobiliary tumours

Renzo Boldorini, Alessia Paganotti, Massimo Sartori, Sara Allegrini, Umberto Miglio, Marco Orsello, Claudia Veggiani, Mario Del Piano, Guido Monga

Risultato della ricerca: Contributo su rivistaArticolo in rivistapeer review

Abstract

AIMS: To assess the sensitivity, specificity, positive and negative predictive values of fluorescence in situ hybridisation (FISH) and conventional cytology in identifying bile duct stricture malignancies. METHODS: Brushing samples were collected from 64 patients by means of endoscopic retrograde cholangiopancreatography, and assessed cytologically and by means of a multi-probe FISH set. The cytological diagnoses were: positive, negative and suspicious, whereas criteria for FISH positivity were: more than five polysomic cells or more than 10 trisomic cells for chromosomes 3 or 7. RESULTS: Forty-eight of the 64 patients showed histological or clinical signs of malignancy. The sensitivity of cytology was high (77%) if suspicious cases were considered positive, but was significantly lower than that of FISH if suspicious cases were considered negative (58% versus 90%; p < 0.05). The specificity of cytology was 81% (positive and suspicious) or 100% (negative and suspicious), and the specificity of FISH was 94% (p = 1). FISH yielded one false negative result (isolated chromosome 7 trisomy). FISH allowed a definite diagnosis of 9/12 cytologically inconclusive cases. CONCLUSIONS: Our findings suggest using FISH in the case of bile duct strictures cytologically negative or inconclusive; a FISH diagnosis of malignancy should only be made in the presence of polysomic pattern.
Lingua originaleInglese
pagine (da-a)335-339
Numero di pagine5
RivistaPathology
Volume43
Numero di pubblicazione4
DOI
Stato di pubblicazionePubblicato - giu 2011

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