Autoimmune Lymphoproliferative Syndrome

Overview

Autoimmune lymphoproliferative syndrome, or ALPS, is a very rare genetic condition that affects the immune system. Normally, after immune cells (called lymphocytes) finish fighting an infection, the body tells them to die off naturally to keep everything balanced. In ALPS, those cells do not die off as they should, so too many lymphocytes build up. This can cause swollen lymph nodes, an enlarged spleen or liver, and sometimes the immune system attacks the body's own blood cells.

No. ALPS is very rare. Doctors do not know exactly how many people have it, but it affects only a very small number of people worldwide.

ALPS can affect anyone, but it is most often diagnosed in children. It affects boys and girls equally and occurs in people of all backgrounds. Some people are diagnosed in adulthood, especially if their symptoms are mild.

Symptoms

Common symptoms

• Swollen lymph nodes (small bean-shaped glands) in the neck, armpits, or groin
• Enlarged spleen or liver, which may cause belly discomfort or fullness
• Low red blood cells (anemia), causing tiredness, pale skin, or shortness of breath
• Low platelets, causing easy bruising, bleeding, or tiny red or purple spots on the skin
• Low white blood cells, which can lead to more frequent or more severe infections

Symptoms in children

• Large but usually painless lymph node swelling that comes and goes
• Recurrent infections, especially ear, sinus, or chest infections
• Fatigue and pale skin
• Frequent nosebleeds or easy bruising
• Slow growth or difficulty gaining weight

Symptoms in older adults

• ALPS is less common in older adults and symptoms may appear later in life
• Symptoms may be milder and sometimes are found by accident during blood tests
• Swollen lymph nodes and low blood counts can still occur, but they may not cause obvious problems at first

Causes

Main causes

• Changes (mutations) in genes that help immune cells die naturally, most often in the FAS gene
• These gene changes are usually inherited from a parent, but they can also happen on their own as a new change
• Because the immune cells survive too long, they build up in the body and can cause inflammation or autoimmunity

Risk factors

• Having a parent, sibling, or other close family member with ALPS
• Carrying a known gene change linked with ALPS
• A family history of certain autoimmune or blood conditions may increase the chance of being checked for ALPS

When to see a doctor

See a doctor urgently if:

• Contact your care team or go to urgent care the same day if you have a fever, unusual bruising or bleeding, yellow skin or eyes, or signs of infection.

Book a routine appointment if:

• Make a routine appointment if lymph nodes stay swollen for more than a few weeks, you feel very tired, you bruise easily, or you keep getting infections.

Diagnosis

A doctor will ask about your symptoms, examine you, and order blood tests. The diagnosis is usually confirmed by special blood tests and often genetic testing that show the specific immune system problem linked with ALPS.

Tests that may be done

• Complete blood count (CBC) to check levels of red blood cells, white blood cells, and platelets
• Blood tests for autoimmune antibodies and immunoglobulin levels
• Flow cytometry, a special blood test that looks for a type of immune cell called double-negative T cells
• Genetic testing to look for known ALPS gene changes

What to expect at your appointment

Testing for ALPS can take a little time. You may be referred to an immunologist or hematologist, doctors who specialize in immune system and blood disorders. They will explain what each test shows and work with you on a care plan.

Treatment

There is no one-size-fits-all treatment for ALPS. Some people need little or no treatment, while others need help managing low blood counts, autoimmune reactions, infections, or an enlarged spleen. Treatment is personal and based on your symptoms, blood results, and how the condition affects your daily life.

Self-care at home

• Keep all follow-up appointments and blood tests
• Wash hands often and do your best to avoid people with active infections
• Tell your healthcare team quickly if you get a fever or unusual bleeding
• Wear a medical alert bracelet or carry a doctor's letter explaining ALPS and any treatments you take

Medical treatments

Treatment may include steroid-type medicines to calm the immune system, medicines that support blood cell counts, antibody replacement therapy given through a vein to help fight infections, or other treatments that calm overactive immune activity. The exact approach is decided by your specialist team and is never one-size-fits-all.

When is surgery considered?

In some cases, surgery to remove an enlarged spleen, called a splenectomy, may be considered if the spleen is causing very low blood counts or other serious problems. Doctors usually avoid this operation unless it is truly necessary, because it increases the risk of serious infections.

Living with this condition

Living with ALPS often means managing ups and downs. Some days you may feel full of energy; other days you may need more rest. Keeping a simple symptom diary and staying in touch with your care team can help you notice changes early and feel more in control.

Lifestyle tips

• Get the vaccines your healthcare provider recommends, but always ask which ones are safe for your immune system
• Protect your skin from cuts, scrapes, and contact sports if your platelets are low
• Stay active when you feel well and rest on days you feel run down
• Carry a list of your treatments and allergies with you

Diet and exercise

Eat a balanced diet with plenty of vegetables, fruit, whole grains, and protein to support your immune system. Gentle exercise like walking, swimming, or stretching can help your energy and mood. If your immune function is low, ask your team about food safety, such as avoiding unpasteurized dairy, raw eggs, or undercooked meat.

Mental health and emotional wellbeing

Living with a rare illness can feel overwhelming at times, and it is completely normal to feel anxious or low. Talking to a counselor, joining a support group, and staying close to family and friends can help. If you ever have thoughts of harming yourself, reach out to your local emergency services or a crisis helpline right away.

Prevention

No. ALPS is caused by inherited genetic changes, so it cannot be prevented. What doctors can do is monitor, treat symptoms, and reduce complications as early as possible.

Vaccines

Vaccines are very important for anyone with ALPS, but some live vaccines may not be safe because the immune system is different. Always tell your healthcare provider and pharmacist about ALPS before receiving any vaccine.

Screening programmes

If you have ALPS, regular blood tests and physical exams are part of routine monitoring. If a family member is diagnosed, genetic counseling can help other relatives understand their own risk and options.

Complications

If left untreated

• Severe anemia that causes profound tiredness and can strain the heart
• Bleeding problems from very low platelets
• Frequent or serious infections from low white blood cells
• Autoimmune conditions, such as the immune system destroying red blood cells or platelets
• A higher chance of lymphoma, a cancer of the lymph system, compared to people without ALPS

Long-term outlook

The outlook for people with ALPS is generally hopeful. With regular monitoring and modern care, many people manage the condition well and live long, productive lives. Some children find their symptoms become milder as they grow older. The risk of lymphoma is real but remains low, and regular check-ups are designed to catch any problems early. Your healthcare team will support you at every step.

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