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Published on: June 28, 2021
Autoimmune pancreatitis in an Asian-dominant American population
Chuong T Tran1, Owen T M Chan, Livingston M F Wong
1Hawaii Medical Center - East, Honolulu, HI, USA.
Summary
Autoimmune pancreatitis, a rare condition, often mimics pancreatic cancer. Elevated serum IgG4 levels can help differentiate it, avoiding unnecessary surgery for patients with obstructive jaundice.
Area of Science:
- Gastroenterology
- Immunology
- Oncology
Background:
- Autoimmune pancreatitis (AIP) is a rare chronic inflammatory condition.
- It predominantly affects males and was first described in Asian populations.
- AIP can present with symptoms and imaging findings similar to pancreatic cancer.
Purpose of the Study:
- To characterize autoimmune pancreatitis in Hawai'i's Asian-dominant population.
- To evaluate the diagnostic utility of serum IgG4 in differentiating AIP from pancreatic malignancy.
Main Methods:
- Retrospective review of 65 pancreaticoduodenectomy cases (2000-2010).
- Analysis of clinical presentation, laboratory findings (serum IgG4, CA19-9, lipase), and imaging.
- Histopathological review of surgical specimens and pre-operative biopsies.
Main Results:
- Six cases of autoimmune pancreatitis were identified (3 post-surgery, 3 pre-surgery).
- All patients were male, presenting with obstructive jaundice, weight loss, epigastric pain, and elevated serum lipase.
- Elevated serum IgG4 was observed in all AIP patients; imaging showed pancreatic head mass and bile duct stricture, but no nodal involvement or vascular invasion.
Conclusions:
- Autoimmune pancreatitis should be considered in patients with obstructive jaundice, especially when presenting with elevated serum IgG4 and normal CA19-9.
- Serum IgG4 is a valuable biomarker for distinguishing AIP from pancreatic cancer.
- Accurate diagnosis of AIP is crucial to prevent unnecessary surgical intervention.
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