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Published on: January 16, 2013
Autoimmune pancreatitis-associated prostatitis: distinct clinicopathological entity.
Takeshi Uehara1, Hideaki Hamano, Masako Kawakami
1Department of Laboratory Medicine, Shinshu University School of Medicine, Matsumoto, Japan. tuehara@hsp.md.shinshu-u.ac.jp
Pathology International
|January 18, 2008
Summary
Autoimmune pancreatitis-associated prostatitis (AIP-P) is a distinct condition characterized by elevated IgG4 levels. This research highlights its unique pathology and suggests a similar mechanism to autoimmune pancreatitis.
Area of Science:
- Immunology
- Pathology
- Urology
Background:
- Autoimmune pancreatitis (AIP) is a recently defined entity characterized by elevated serum IgG4 levels.
- AIP can be associated with other inflammatory conditions like retroperitoneal fibrosis and sclerosing cholangitis.
Purpose of the Study:
- To clarify the clinicopathological features of autoimmune pancreatitis-associated prostatitis (AIP-P).
- To compare IgG subclass expression in AIP-P patients versus controls.
Main Methods:
- Clinicopathological evaluation of six AIP-P patients.
- Immunohistochemical analysis of IgG subclasses (IgG1-4) in AIP-P patients and 10 controls.
- Comparison of IgG4-positive plasma cell ratios between groups.
Main Results:
- All AIP-P patients exhibited AIP characteristics, with lower urinary tract symptoms improving after steroid therapy.
- Prostate enlargement was noted in 4/5 AIP-P patients via digital rectal examination.
- Histology revealed lymphoplasmacytic infiltration, eosinophils, obliterative phlebitis, atrophy, and fibrosis.
- The IgG4-positive plasma cell/mononuclear cell ratio was significantly higher in AIP-P patients (P=0.0011).
Conclusions:
- Autoimmune pancreatitis-associated prostatitis (AIP-P) represents a distinct clinicopathological entity.
- The pathogenesis of AIP-P may involve mechanisms similar to those in AIP.
- Elevated IgG4 levels are a key feature, suggesting its role in the disease process.
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