Abstract
Autoimmune pancreatitis (AIP) is an entity that has been recognized since 1961. Prior to the discovery of elevated serum IgG4 as a useful biomarker for its diagnosis, Dr. Yoshida in 1995 first described the entity of AIP, which in retrospect closely resembles the current concept of type 1 AIP. Since the discovery of IgG4 as a biomarker (the IgG4-era), a novel concept of IgG4-related disease (IgG4-RD) has been accepted as being comprised of two subtypes of AIP: type 1 defined as the pancreatic manifestation of IgG4-RD, and type 2 characterized by granulocytic epithelial lesions. The characteristic features of type 1 AIP are increased serum IgG4 levels, lymphoplasmacytic sclerosing pancreatitis (abundant infiltration of IgG4+ plasmocytes and lymphocytes, storiform fibrosis, and obliterative phlebitis), extrapancreatic manifestations of IgG4-RD (e.g., sclerosing cholangitis, sclerosing sialadenitis, retroperitoneal fibrosis), and steroid responsiveness. These entities can be differentiated from mimickers by a combination of serum IgG4 level, imaging features, and histopathological findings. The current first-line therapy is corticosteroids, or rituximab in high-risk patients with steroid intolerance. Although relapse rates are high, treatment of relapsed disease remains experimental.
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Abbreviations
- AIP:
-
Autoimmune pancreatitis
- ANA:
-
Anti-nuclear antibody
- CDC:
-
Comprehensive diagnostic criteria
- ERCP:
-
Endoscopic retrograde cholangiopancreatography
- GEL:
-
Granulocytic epithelial lesion
- ICDC:
-
International consensus of diagnostic criteria
- IDCP:
-
Idiopathic duct-centric pancreatitis
- IgG4-RD:
-
IgG4-related disease
- JPS:
-
Japan Pancreas Society
- LPSP:
-
Lymphoplasmacytic sclerosing pancreatitis
- MD:
-
Mikulicz disease
- MIF:
-
Multifocal idiopathic fibrosclerosis
- MOLPS:
-
Multi-organ lymphoproliferative disease
- MPD:
-
Main pancreatic duct
- OOI:
-
Other organ involvement
- PSC:
-
Primary sclerosing cholangitis
- RF:
-
Rheumatoid factor
- SIPS:
-
IgG4-systemic plasmacytic syndrome
- SjS:
-
Sjögren’s syndrome
- SLE:
-
Systemic lupus erythematosus
- UNL:
-
Upper normal limit
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Acknowledgments
This study was partly supported by a Grant-in-Aid for Scientific Research from the Ministry of Culture and Science of Japan (23591017), and a Grant-in-Aid for “Research for Intractable Disease” Program from the Ministry of Health, Labor and Welfare of Japan.
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Okazaki, K. Autoimmune Pancreatitis and IgG4-Related Disease: The Storiform Discovery to Treatment. Dig Dis Sci 64, 2385–2394 (2019). https://doi.org/10.1007/s10620-019-05746-9
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DOI: https://doi.org/10.1007/s10620-019-05746-9