Summary
Salivary and serum concentrations of β2-microglobulin, salivary levels of the immunoglobulins, and salivary flow (as measured by a gravimetric method) were assessed in 34 patients and 11 controls. Of the 34 study patients, 16 had a primary form of Sjögren's syndrome (pSS) and 18 had sicca syndrome. The salivary and serum concentrations of β2-microglobulin and salivary levels of IgA and IgG were much higher in the patients with pSS than in controls or those with sicca syndrome (p<0.001). Similarly, the salivary IgM levels of patients with pSS were higher (although at a lower degree of statistical significance) as compared to those of patients with sicca syndrome (p<0.01) or controls (p<0.05). No correlation was observed among the salivary flow and the salivary IgG and IgM levels, while there was a negative relationship (p<0.01 with salivary IgA levels in all 45 patients considered as a whole.
In 12 patients with pSS, the coefficient of correlation between the salivary gland biopsy focus score and the salivary (but not serum) concentration of β2-microglobulin was highly significant (p<0.001). A similar relationship was observed with the IgG (p<0.001) and IgM (p<0.05) levels, but not IgA.
In the diagnosis of pSS, the salivary IgA level demonstrates high sensitivity and low specificity. In contrast, serum and salivary concentrations of β2-microglobulin salivary IgG, and to a lesser degree, salivary IgM have high specificity and positive predictive value. Because they are non-invasive and easily repeatable, the measurement of salivary and serum β2-microglobulin concentrations and salivary IgG and IgM levels are proposed as aids in the management of patients with pSS.
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Bongi, S.M., Campana, G., D'agata, A. et al. The diagnosis value of β2-microglobulin and immunoglobulins in primary Sjögren's syndrome. Clin Rheumatol 14, 151–156 (1995). https://doi.org/10.1007/BF02214934
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DOI: https://doi.org/10.1007/BF02214934