Proposal for a new clinical entity, IgG4-positive multiorgan lymphoproliferative syndrome: analysis of 64 cases of IgG4-related disorders

Published on Aug 1, 2009in Annals of the Rheumatic Diseases16.102
· DOI :10.1136/ARD.2008.089169
Yasufumi Masaki28
Estimated H-index: 28
(Kanazawa Medical University),
Lingli Dong16
Estimated H-index: 16
(Kanazawa Medical University)
+ 29 AuthorsHisanori Umehara43
Estimated H-index: 43
(Kanazawa Medical University)
Background: Mikulicz’s disease (MD) has been considered as one manifestation of Sjogren’s syndrome (SS). Recently, it has also been considered as an IgG 4 -related disorder. Objective: To determine the differences between IgG 4 -related disorders including MD and SS. Methods: A study was undertaken to investigate patients with MD and IgG 4 -related disorders registered in Japan and to set up provisional criteria for the new clinical entity IgG 4 -positive multiorgan lymphoproliferative syndrome (IgG 4 +MOLPS). The preliminary diagnostic criteria include raised serum levels of IgG 4 (>135 mg/dl) and infiltration of IgG 4 + plasma cells in the tissue (IgG 4 +/IgG+ plasma cells >50%) with fibrosis or sclerosis. The clinical features, laboratory data and pathologies of 64 patients with IgG 4 +MOLPS and 31 patients with typical SS were compared. Results: The incidence of xerostomia, xerophthalmia and arthralgia, rheumatoid factor and antinuclear, antiSS-A/Ro and antiSS-B/La antibodies was significantly lower in patients with IgG 4 +MOLPS than in those with typical SS. Allergic rhinitis and autoimmune pancreatitis were significantly more frequent and total IgG, IgG 2 , IgG 4 and IgE levels were significantly increased in IgG 4 +MOLPS. Histological specimens from patients with IgG 4 +MOLPS revealed marked IgG 4 + plasma cell infiltration. Many patients with IgG 4 +MOLPS had lymphocytic follicle formation, but lymphoepithelial lesions were rare. Few IgG 4 + cells were seen in the tissue of patients with typical SS. Thirty-eight patients with IgG 4 +MOLPS treated with glucocorticoids showed marked clinical improvement. Conclusion: Despite similarities in the involved organs, there are considerable clinical and pathological differences between IgG 4 +MOLPS and SS. Based on the clinical features and good response to glucocorticoids, we propose a new clinical entity: IgG 4 +MOLPS.
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