Castleman Disease

What is Castleman Disease?

Castleman disease is a rare condition that affects your lymph nodes and immune system. It causes lymph nodes to become enlarged and overproduce certain immune proteins. The condition comes in two main forms: unicentric, affecting one lymph node area, and multicentric, affecting multiple lymph node regions throughout the body.

The multicentric form is more serious and involves excessive production of interleukin-6, or IL-6. This protein normally helps your immune system fight infections. When your body makes too much IL-6, it triggers widespread inflammation that can affect multiple organs. This ongoing inflammation can lead to fever, fatigue, fluid buildup, and organ damage if left untreated.

Castleman disease is not cancer, but it shares some features with lymphoma. People with certain types of the condition have a higher risk of developing lymphoma later. Understanding your IL-6 levels and getting proper diagnosis helps guide treatment and monitor your health over time.

Interleukin-6 (IL-6), Serum

Measures body's inflammation response
Checks for immune system activity
Assesses body's infection indicators

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Symptoms

Enlarged lymph nodes in the neck, chest, abdomen, or groin
Persistent fever and night sweats
Unintentional weight loss
Extreme fatigue and weakness
Fluid buildup in the abdomen or around the lungs
Skin rashes or lesions
Enlarged liver or spleen
Neuropathy, or nerve damage causing numbness and tingling
Anemia causing pale skin and shortness of breath

People with unicentric Castleman disease may have no symptoms at all. The enlarged lymph node might be discovered during imaging for an unrelated reason. Multicentric disease usually causes more noticeable symptoms due to the widespread inflammation affecting multiple body systems.

Causes and risk factors

The exact cause of Castleman disease remains unclear in many cases. The multicentric form is often linked to viral infections, particularly human herpesvirus-8, or HHV-8. This virus is more common in people with weakened immune systems, including those with HIV. The virus triggers cells to overproduce IL-6, leading to chronic inflammation and the symptoms of the disease.

Risk factors include having HIV or AIDS, being older than 60 years, and living in regions where HHV-8 is more common. People with autoimmune conditions or other immune system disorders may also face higher risk. The unicentric form has no clear viral connection and may develop without any known trigger. Genetics likely play a role, but Castleman disease does not typically run in families.

How it's diagnosed

Diagnosing Castleman disease requires multiple tests because the condition is rare and mimics other disorders. Doctors typically start with imaging studies like CT scans or PET scans to locate enlarged lymph nodes. A lymph node biopsy is essential for confirming the diagnosis. During this procedure, doctors remove all or part of an enlarged lymph node to examine under a microscope.

Blood tests help assess inflammation levels and organ function. Testing for interleukin-6, or IL-6, shows how much of this inflammatory protein is in your blood. High IL-6 levels support the diagnosis and help doctors monitor disease activity during treatment. Additional blood work checks for anemia, kidney function, liver enzymes, and viral infections like HHV-8 and HIV. Talk to a doctor about specialized testing for this rare condition.

Treatment options

Surgical removal of the affected lymph node for unicentric disease
Siltuximab, a medication that blocks IL-6 activity in multicentric disease
Rituximab, an antibody therapy targeting immune cells
Chemotherapy for severe or aggressive cases
Antiviral medications for HHV-8 positive patients
Antiretroviral therapy for patients with HIV
Corticosteroids to reduce inflammation during flares
Regular monitoring with blood tests and imaging
Supportive care for anemia, fluid buildup, and organ complications

Frequently asked questions

Unicentric Castleman disease affects only one lymph node area and is usually less severe. Multicentric disease involves multiple lymph node regions throughout the body and causes systemic symptoms. Unicentric disease can often be cured with surgery, while multicentric disease requires ongoing medication. The multicentric form is associated with viral infections and higher IL-6 levels.

Castleman disease is not cancer, but it is a lymphoproliferative disorder. This means it involves abnormal growth of lymph tissue and immune cells. People with the multicentric form have a higher risk of developing lymphoma, a type of blood cancer. Regular monitoring helps detect any progression early so treatment can begin promptly.

In Castleman disease, immune cells and lymph tissue overproduce interleukin-6. This protein normally helps coordinate immune responses to infection. In the multicentric form, viral infection with HHV-8 often triggers this overproduction. The excessive IL-6 causes widespread inflammation affecting multiple organs and systems throughout the body.

Unicentric Castleman disease can often be cured with surgical removal of the affected lymph node. Multicentric disease typically requires long-term treatment with medications to control symptoms and inflammation. While not always curable, multicentric disease can be managed effectively with modern therapies. Many people achieve remission with proper treatment and monitoring.

Diagnosis requires a lymph node biopsy to examine tissue under a microscope. Doctors also use CT scans or PET scans to locate enlarged lymph nodes throughout the body. Blood tests measure IL-6 levels, check for anemia, and assess organ function. Testing for HHV-8 and HIV helps identify underlying infections that may contribute to the disease.

People with HIV or AIDS face higher risk, especially for the multicentric form. Older adults over 60 years are more likely to develop the condition. Those living in areas where HHV-8 is common have increased risk. However, Castleman disease is rare overall and can occur in people with no known risk factors.

Siltuximab is a targeted therapy that blocks IL-6 and reduces inflammation. Rituximab is an antibody treatment that targets specific immune cells involved in the disease. Chemotherapy may be used for severe cases that do not respond to other treatments. Antiviral medications help patients with HHV-8, and antiretroviral therapy is essential for those with HIV.

Lifestyle changes support overall health but cannot replace medical treatment for Castleman disease. Eating a balanced diet rich in nutrients helps maintain strength during treatment. Getting adequate rest and managing stress support immune function. Avoiding infections through good hygiene and staying up to date on vaccinations is important for people with this condition.

Monitoring frequency depends on disease severity and treatment response. Doctors typically check IL-6 levels every few months during active treatment. Once the disease is stable or in remission, testing may happen less frequently. Regular monitoring helps doctors adjust medications and catch disease flares early before symptoms become severe.

Untreated multicentric disease can cause severe organ damage from chronic inflammation. Kidney failure, liver problems, and heart complications may develop over time. Severe anemia can lead to fatigue and difficulty breathing. The condition can also progress to lymphoma or other serious blood disorders if not properly managed with treatment.