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Open Access Research article

Multilevel examination of minor salivary gland biopsy for Sjögren's syndrome significantly improves diagnostic performance of AECG classification criteria

Patrizia Morbini1*, Antonio Manzo2, Roberto Caporali2, Oscar Epis2, Chiara Villa1, Carmine Tinelli3, Enrico Solcia1 and Carlomaurizio Montecucco2

Author Affiliations

1 Department of Pathology, IRCCS Policlinico S Matteo, Pavia, Italy

2 Department of Rheumatology, IRCCS Policlinico S Matteo, Pavia, Italy

3 Biometric Unit, IRCCS Policlinico S Matteo, Pavia, Italy

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Arthritis Res Ther 2005, 7:R343-R348  doi:10.1186/ar1486

Published: 17 January 2005

Abstract

The recently observed low reproducibility of focus score (FS) assessment at different section depths in a series of single minor salivary gland biopsies highlighted the need for a standardized protocol of extensive histopathological examination of such biopsies in Sjögren's syndrome. For this purpose, a cumulative focus score (cFS) was evaluated on three slides cut at 200-μm intervals from each of a series of 120 salivary biopsies. The cFS was substituted for the baseline FS in the American–European Consensus Group (AECG) criteria set for Sjögren's syndrome classification, and then test specificity and sensitivity were assessed against clinical patient re-evaluation. Test performances of the AECG classification with the original FS and the score obtained after multilevel examination were statistically compared using receiver operating characteristic (ROC) curve analysis. The diagnostic performance of AECG classification significantly improved when the cFS was entered in the AECG classification; the improvement was mostly due to increased specificity in biopsies with a baseline FS ≥ 1 but <2. The assessment of a cFS obtained at three different section levels on minor salivary gland biopsies can be useful especially in biopsies with baseline FSs between 1 and 2.

Keywords:
focus score; minor salivary gland biopsy; multilevel examination; Sjögren's syndrome