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Recent advances in autoimmune pancreatitis
Terumi Kamisawa1, Taku Tabata, Seiichi Hara
1Department of Internal Medicine, Tokyo Metropolitan Komagome Hospital Tokyo, Japan.
Frontiers in Physiology
|October 13, 2012
Summary
Autoimmune pancreatitis (AIP) has two types: Type-1 (LPSP) and Type-2. Steroid therapy is effective for both, with specific protocols for oral prednisolone to manage symptoms and prevent relapse.
Area of Science:
- Gastroenterology
- Immunology
- Pathology
Background:
- Autoimmune pancreatitis (AIP) is increasingly recognized with two distinct histological subtypes: Type-1 (lymphoplasmacytic sclerosing pancreatitis - LPSP) and Type-2.
- Type-1 AIP is characterized by lymphoplasmacytic infiltration and IgG4 elevation, while Type-2 AIP shows neutrophilic infiltration of pancreatic ducts.
- Geographical variations exist, with Type-1 AIP predominant in Japan and Korea, and Type-2 AIP more frequently observed in Western countries.
Purpose of the Study:
- To delineate the key differences between Type-1 and Type-2 autoimmune pancreatitis.
- To outline the international consensus diagnostic criteria for AIP.
- To describe the standard steroid therapy protocols for managing AIP.
Main Methods:
- Histopathological classification differentiating Type-1 (LPSP) and Type-2 AIP based on characteristic inflammatory cell infiltrates.
- Application of international consensus diagnostic criteria incorporating five cardinal features.
- Clinical observation of patient demographics, associated conditions, and treatment responses.
Main Results:
- Type-2 AIP patients are generally younger, less likely to have elevated serum IgG4, and more prone to acute pancreatitis and ulcerative colitis compared to Type-1 patients.
- Type-1 AIP is associated with sclerosing extrpancreatic diseases, unlike Type-2 AIP.
- Steroid therapy, particularly oral prednisolone, demonstrates significant clinical, morphological, and serological efficacy in AIP management.
Conclusions:
- Distinguishing between Type-1 and Type-2 AIP is crucial for understanding disease behavior and prognosis.
- International consensus criteria facilitate accurate diagnosis of both AIP subtypes.
- Steroid therapy, with a defined tapering regimen, is the cornerstone treatment for autoimmune pancreatitis, effectively managing symptoms and preventing relapses.
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