About Autoimmune Pancreatitis
Autoimmune pancreatitis (AIP) is a specific type of pancreatitis (inflammation and swelling of the pancreas) caused by the immune system attacking the pancreas. It has two types:
- Type 1 AIP is the most common and happens when a specific antibody called IgG4 attacks healthy tissue in the pancreas. It may also affect other organs such as the bile ducts, kidneys, and thyroid. Type 1 AIP is more common in people assigned male at birth, those 60 years and older, and people of Asian descent.
- Type 2 AIP has different features and affects people differently than type 1.
The exact cause of AIP is still unknown, but it is believed to involve a mix of genetics and environmental factors. Diagnosis of AIP involves clinical exam, imaging tests, blood tests for IgG4 levels, and sometimes a biopsy. Treatment usually includes corticosteroid medication which usually works well for most patients.
The cause of AIP is the immune system attacking specific parts of the pancreas, which leads to long-term inflammation and scarring.
Risk factors for AIP include:
- Genetics: Some genetic factors may increase the risk of developing AIP, even though specific genes have not been found yet.
- Gender: People assigned male at birth are at higher risk.
- Autoimmune disorders: Other autoimmune disorders such as ulcerative colitis (a condition where the immune system causes inflammation in the colon) or thyroiditis (inflammation of the thyroid gland) can increase the risk of developing AIP.
It's important to note that these risk factors are linked with a higher chance of developing AIP but does not mean it will happen. If you think you may have AIP or have concerns about your risk factors, it's best to talk with your healthcare professional to get the correct diagnosis and the right treatment plan.
The most common early symptoms of autoimmune pancreatitis include:
- Jaundice (yellowing of the skin and eyes)
- Upper abdominal pain
- Fatigue (feeling very tired)
- Loss of appetite
- Unplanned weight loss
- Nausea or vomiting
As the condition gets worse over time or becomes more serious, other common symptoms may occur, such as:
- Dark urine
- Pale or clay-colored stools: Stools that are lighter than normal
- Enlargement of the pancreas: Pancreas becomes larger than usual
It's important to note that abdominal pain is more common in type 2 than in type 1. The pain is usually mild and comes and goes. These symptoms, along with the pancreas being larger than normal, and noncancerous growths, can sometimes be mistaken for pancreatic cancer. If you have any of these symptoms, it is important to see your doctor for the right diagnosis and treatment.
To diagnose autoimmune pancreatitis, the following exams, tests, and procedures are commonly performed:
- History and physical exam: The healthcare provider will ask about your symptoms and any factors that could be related to your condition.
- Lab tests: Blood tests may be ordered.
- IgG4 levels: High levels of IgG4 antibodies are often seen in type 1 AIP. This is a key marker for diagnosing the condition.
- Liver function tests: These check for signs of bile duct blockage, which can happen if the pancreas is inflamed.
- Inflammation markers: Tests such a C-reactive protein (CRP) can show inflammation in the body, showing an active immune response.
- Imaging studies: Imaging tests like computed tomography (CT) scan, magnetic resonance imaging (MRI) scan, or ultrasound can provide a view of the pancreas and its ducts.
To determine the stage or seriousness of autoimmune pancreatitis, additional exams, tests, and procedures may be recommended:
- Biopsy: A biopsy may be done to collect a small sample of tissue from the pancreas for more testing.
- Additional imaging studies: Depending on the symptoms and which part of the body is being checked, your doctor might suggest additional imaging tests, such as a magnetic resonance cholangiopancreatography (MRCP), which helps doctors see if there are any blockages or other issues in the ducts.
It is important to talk with your healthcare provider for advice and to discuss any concerns you may have.
The goals of treatment for autoimmune pancreatitis (AIP) are to relieve symptoms, bring the disease into remission (where symptoms go away), and prevent it from getting worse. Here are the different types of treatments and how they work to achieve these goals:
Medications:
- Corticosteroids: These drugs, such as prednisone and prednisolone, reduce inflammation by calming down the immune system. They are the first treatment used for active AIP and can help bring the disease into remission.
Therapies:
- Biologic drugs: In some cases, biologic therapies (treatments made from living cells) like anti-tumor necrosis factor (TNF) therapy (which blocks a protein that causes inflammation) may be used if AIP type 2 comes back or if the patient depends on steroids. These drugs offer another option to corticosteroids and immune-suppressing drugs (medicines that weaken the immune system to stop it from attacking healthy parts of the body), which may have serious side effects.
Therapeutic procedures:
- Stent placement: If there is a narrowing or blockage in the pancreatic or bile ducts due to AIP, a stent (a small tube) may be placed in the affected duct. This helps keep the duct open and allows fluids to flow properly.
It's important to note that these treatments help control symptoms, bring the disease into remission, and stop it from getting worse. However, treatment plans may be different for each person depending on how serious their symptoms are and how well they respond to the treatment. Always talk with your healthcare professional for personalized advice.
Medication dosing may be affected by many factors. Check with your health care professional about dosing for your individual situation. Other side effects can occur. Check with your health care professional or read the information provided with your medication for additional side effect information.