Hairy cell leukemia is a cancer of the white blood cells. The white blood cells help fight off germs. There are a few different types of white blood cells. The white blood cells involved in hairy cell leukemia are called B cells. B cells are also called B lymphocytes.
In hairy cell leukemia, the body makes too many B cells. The cells don't look like healthy B cells. Instead, they've undergone changes to become leukemia cells. The leukemia cells look "hairy" under a microscope.
Hairy cell leukemia cells keep living when healthy cells would die as part of the natural cell life cycle. The leukemia cells build up in the body and cause symptoms.
Hairy cell leukemia often gets worse slowly. Treatment might not need to start right away. When it's needed, treatment is usually with chemotherapy.
Scientists found a type of cancer that looks like hairy cell leukemia, but it gets worse much faster. This other type of cancer is called hairy cell leukemia variant. It's considered a separate type of cancer from hairy cell leukemia, even though it has a similar name.
Hairy cell leukemia might not cause symptoms. Sometimes a health care provider finds it by accident during a blood test for another condition.
When it causes symptoms, hairy cell leukemia might cause:
Make an appointment with your health care provider if you have any persistent signs and symptoms that worry you.
It's not clear what causes hairy cell leukemia.
Hairy cell leukemia begins in the white blood cells. The white blood cells help fight germs in the body. There are a few types of white blood cells. The white blood cells involved in hairy cell leukemia are called B cells.
Hairy cell leukemia happens when B cells develop changes in their DNA. A cell's DNA contains the instructions that tell a cell what to do. The changes tell the B cells to make a lot more B cells that don't work right. These cells go on living when healthy cells would die as part of the natural cell life cycle.
The B cells that don't work right crowd out healthy blood cells in the bone marrow and other organs. This leads to the symptoms and complications of hairy cell leukemia. For example, the extra cells can cause swelling in the spleen, liver and lymph nodes. If there isn't enough room for healthy blood cells, this can lead to frequent infections, easy bruising and feeling very tired.
The risk of hairy cell leukemia may be higher in:
Hairy cell leukemia often gets worse very slowly. Sometimes it stays stable for many years. For this reason, few complications of the disease occur.
If there are too many leukemia cells in the body, they can crowd out the healthy blood cells. That can lead to:
Some studies found that people with hairy cell leukemia have an increased risk of other types of cancer. The other cancers include non-Hodgkin's lymphoma, Hodgkin's lymphoma and others. It's not clear if the other cancers are caused by hairy cell leukemia or by cancer treatments.
To diagnose hairy cell leukemia, your health care provider may recommend:
Blood tests. You might have a blood test to measure the levels of blood cells in your blood. This test is called a complete blood count (CBC) with differential.
You have three main types of blood cells in your blood. They include red blood cells, white blood cells and platelets. In hairy cell leukemia, a CBC test may show all levels of these cells are too low.
Another type of blood test might involve looking at your blood under the microscope. This test can find hairy cell leukemia cells. This test is called a peripheral blood smear.
Hairy cell leukemia treatments are good at controlling the disease. But they can't make it go away completely. Instead, treatments can control the cancer so that you can go about your life as usual. People with hairy cell leukemia can live with the disease for many years.
Treatment for hairy cell leukemia doesn't always need to start right away. This cancer often gets worse very slowly over time. You might choose to wait and have treatment if the cancer starts to cause symptoms.
If you don't have treatment, you'll have regular appointments with your health care provider. You might have blood tests to see if hairy cell leukemia is getting worse.
You might decide to start treatment if you start to get hairy cell leukemia symptoms. Most people with hairy cell leukemia will eventually need treatment.
Chemotherapy is a drug treatment that uses powerful drugs to kill cancer cells. It's often the first treatment for hairy cell leukemia. Chemotherapy is very effective for hairy cell leukemia. Most people get a complete or partial remission after chemotherapy. Remission means you have no signs of cancer.
Chemotherapy for hairy cell leukemia can be given as a shot. Or it can be given as an infusion into a vein.
If your hairy cell leukemia comes back, your provider might recommend repeating chemotherapy with the same drug or trying a different drug. Another option may be targeted drug therapy.
Targeted drug treatments attack specific chemicals present within cancer cells. By blocking these chemicals, targeted drug treatments can cause cancer cells to die.
Targeted drug therapy is sometimes used as a first treatment for hairy cell leukemia. It can be used with chemotherapy. More often, targeted therapy is an option if the cancer comes back after chemotherapy.
Your health care provider will have your cancer cells tested to see whether targeted drug therapy is likely to work for you.
No alternative medicines are helpful for treating hairy cell leukemia. Alternative medicine might be helpful in other ways. It may help you cope with the stress of a cancer diagnosis and the treatment side effects.
Talk to your health care provider about your options, such as:
A cancer diagnosis can feel overwhelming. To help you cope, you might consider trying to:
Connect with other cancer survivors. Friends and family provide an important support network during your cancer experience. But they can't always understand what it's like to face cancer. Other cancer survivors provide a unique network of support.
Ask your provider about support groups or organizations in your community that can connect you with other cancer survivors. Organizations such as the Hairy Cell Leukemia Foundation and the Leukemia & Lymphoma Society offer ways to connect with others online.
Take care of yourself. You can't control whether your hairy cell leukemia comes back, but you can control other aspects of your health.
Take care of yourself by eating a balanced diet with plenty of fruits and vegetables. Exercise regularly. Get enough sleep so that you wake up feeling refreshed. Find healthy ways to cope with the stresses in your life.
Start by seeing your usual health care provider if you have any symptoms that worry you. If your provider suspects you may have hairy cell leukemia, they may suggest that you see a specialist. This might be a doctor who treats diseases of the blood and bone marrow. This doctor is called a hematologist.
Appointments can be brief, so it's a good idea to be prepared. Here's some information to help you get ready.
Your time with your provider is limited. Prepare a list of questions so that you can make the most of your time together. List your questions from most important to least important in case time runs out. For hairy cell leukemia, some basic questions to ask include the following:
Your provider is likely to ask you a number of questions. Being ready to answer them may allow more time later to cover other points you want to address. Your provider may ask:
