Immunoglobulin G4-related prostatitis: A case-control study focusing on clinical and pathologic characteristics

Jorie Buijs, Lucas Maillette De Buy Wenniger, Geert Van Leenders, Joanne Verheij, Ilze Van Onna, Bettina Hansen, Marianne Van Heerde, Nanda Krak, Ulrich Beuers, Marco Bruno, Henk Van Buuren*

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review


Objective To evaluate the occurrence and histopathologic characteristics of immunoglobulin G4 (IgG4)-related prostatic involvement in patients diagnosed with autoimmune pancreatitis. Methods Nine cases of IgG4-related prostatitis were identified among 117 men in the autoimmune pancreatitis and IgG4-associated cholangitis patient databases in 2 tertiary hospitals. Clinical information was retrieved, and available prostatic tissue samples and 18 prostatitis control samples were evaluated for characteristic IgG4-related disease (IgG4-RD) features: maximum number of IgG4-positive cells per high-power field; dense lymphoplasmacytic infiltrate; fibrosis, arranged at least focally in a storiform pattern; phlebitis with or without obliteration of the lumen; and increased number of eosinophils. Results The aspecific sign of urine retention was commonly present in IgG4-RD patients with prostatic involvement. In these patients with IgG4-related prostatitis, the median number of IgG4-positive cells in prostatic tissue was 150 (interquartile range, 20-150) per high-power field compared with a median of 3 (interquartile range, 1-11) in control patients (P =.008). Dense lymphoplasmacytic infiltrate was observed in most (86% in cases and 72% in control patients) tissue samples independent of the underlying cause of prostatitis. Fibrosis in at least a focally storiform pattern was seen rarely in both groups, and (obliterative) phlebitis was absent in all patients. Furthermore, eosinophil numbers were more often elevated in patients with IgG4-RD compared with controls (P <.001). In 2 cases, amelioration of the prostatitis symptoms on corticosteroid treatment was documented. Conclusion Prostatic involvement might not be rare in patients with pancreatic or biliary IgG4-RD. Clinicians should consider this disease entity in patients with IgG4-RD and prostatic symptoms.

Original languageEnglish
Pages (from-to)521-527
Number of pages7
Issue number3
Publication statusPublished - 2014

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