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Chronic lymphocytic leukemia (CLL) is a type of cancer of the blood and bone marrow — the spongy tissue inside bones where blood cells are made.
The term "chronic" in chronic lymphocytic leukemia comes from the fact that it typically progresses more slowly than other types of leukemia. The term "lymphocytic" in chronic lymphocytic leukemia comes from the cells affected by the disease — a group of white blood cells called lymphocytes, which help your body fight infection.
Chronic lymphocytic leukemia most commonly affects older adults. There are treatments to help control the disease.
Symptoms
Many people with chronic lymphocytic leukemia have no early symptoms. Those who do develop signs and symptoms may experience:
- • Enlarged, but painless, lymph nodes
- • Fatigue
- • Fever
- • Pain in the upper left portion of the abdomen, which may be caused by an enlarged spleen
- • Night sweats
- • Weight loss
- • Frequent infections
When to see a doctor
Make an appointment with your doctor if you have any persistent signs and symptoms that worry you.
Causes
Doctors aren't certain what starts the process that causes chronic lymphocytic leukemia. What's known is that something happens to cause a genetic mutation in the DNA of blood-producing cells. This mutation causes the blood cells to produce abnormal, ineffective lymphocytes.
Beyond being ineffective, these abnormal lymphocytes continue to live and multiply, when normal lymphocytes would die. The abnormal lymphocytes accumulate in the blood and certain organs, where they cause complications. They may crowd healthy cells out of the bone marrow and interfere with normal blood cell production.
Doctors and researchers are working to understand the exact mechanism that causes chronic lymphocytic leukemia.
Risk factors
Factors that may increase the risk of chronic lymphocytic leukemia include:
- Your age. This disease occurs most often in older adults. On average, people diagnosed with chronic lymphocytic leukemia are in their 70s.
- Your race. Whites are more likely to develop chronic lymphocytic leukemia than are people of other races.
- Family history of blood and bone marrow cancers. A family history of chronic lymphocytic leukemia or other blood and bone marrow cancers may increase your risk.
- Exposure to chemicals. Certain herbicides and insecticides, including Agent Orange used during the Vietnam War, have been linked to an increased risk of chronic lymphocytic leukemia.
Complications
Chronic lymphocytic leukemia may cause complications such as:
- Frequent infections. People with chronic lymphocytic leukemia may experience frequent infections. In most cases, these infections are common infections of the upper and lower respiratory tract. But sometimes more-serious infections can develop.
- A switch to a more aggressive form of cancer. A small number of people with chronic lymphocytic leukemia may develop a more aggressive form of cancer called diffuse large B-cell lymphoma. Doctors sometimes refer to this as Richter's syndrome.
- Increased risk of other cancers. People with chronic lymphocytic leukemia have an increased risk of other types of cancer, including skin cancer, such as melanoma, and cancers of the lung and the digestive tract.
- Immune system problems. A small number of people with chronic lymphocytic leukemia may develop an immune system problem that causes the disease-fighting cells of the immune system to mistakenly attack the red blood cells or the platelets.
Diagnosis
Blood tests
Tests and procedures used to diagnose chronic lymphocytic leukemia include blood tests designed to:
- Count the number of cells in a blood sample. A complete blood count may be used to count the number of lymphocytes in a blood sample. A high number of B cells, one type of lymphocyte, may indicate chronic lymphocytic leukemia.
Determine the type of lymphocytes involved. A test called flow cytometry or immunophenotyping helps determine whether an increased number of lymphocytes is due to chronic lymphocytic leukemia, a different blood disorder or your body's reaction to another process, such as infection.
If chronic lymphocytic leukemia is present, flow cytometry may also help analyze the leukemia cells for characteristics that help predict how aggressive the cells are.
- Analyze lymphocytes for genetic abnormalities. A test called fluorescence in situ hybridization (FISH) examines the chromosomes inside the abnormal lymphocytes to look for abnormalities. Doctors sometimes use this information to determine your prognosis and help choose a treatment.
Other tests
In some cases, your doctor may order additional tests and procedures to aid in diagnosis, such as:
- • Tests of your leukemia cells that look for characteristics that could affect your prognosis
- • Bone marrow biopsy and aspiration
- • Imaging tests, such as computerized tomography (CT) and positron emission tomography (PET)
Staging
Once a diagnosis is confirmed, your doctor determines the extent (stage) of your chronic lymphocytic leukemia. Your doctor will use information about your cancer to assign a stage — early, intermediate or advanced — that indicates the progression of your chronic lymphocytic leukemia.
In general, people with early-stage disease don't require immediate treatment. Those with intermediate-stage disease and advanced-stage disease may be given the option to begin treatment right away.
Treatment
Your treatment options for chronic lymphocytic leukemia depend on several factors, such as the stage of your cancer, whether you're experiencing signs and symptoms, your overall health, and your preferences.
Treatment may not be necessary in early stages
People with early-stage chronic lymphocytic leukemia typically don't receive treatment. Studies have shown that early treatment doesn't extend lives for people with early-stage chronic lymphocytic leukemia.
Rather than put you through the potential side effects and complications of treatment before you need it, doctors carefully monitor your condition and reserve treatment for when your leukemia progresses. Doctors call this watchful waiting.
Your doctor will plan a checkup schedule for you. You may meet with your doctor and have your blood tested every few months to monitor your condition.
Treatment for people with early-stage chronic lymphocytic leukemia is offered only through clinical trials. Studies that evaluate whether early treatment may be helpful might be an option for people with early-stage disease that has a high risk of progression. Talk to your doctor about your options.
Treatments for intermediate and advanced stages
Your doctor uses the stage of your chronic lymphocytic leukemia, results from various tests —including laboratory analysis of your cancer cells — and your overall health to make recommendations about your treatment.
If your doctor determines your chronic lymphocytic leukemia is progressing or is in the intermediate or advanced stages, your treatment options may include:
- Chemotherapy. Chemotherapy is a drug treatment that kills quickly growing cells, including cancer cells. Chemotherapy treatments can be administered through a vein or taken in pill form. Depending on your situation, your doctor may use a single chemotherapy drug or you may receive a combination of drugs.
- Targeted drug therapy. Targeted drugs are designed to take advantage of the specific vulnerabilities of your cancer cells. Your cancer cells are tested to determine which targeted drugs may be helpful.
- Immunotherapy. Immunotherapy is a treatment that uses your body's immune system to fight cancer. Immunotherapy treatments may make it easier for your immune system to identify cancer cells or train your immune system cells to fight cancer cells.
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Bone marrow transplant. A bone marrow transplant, also known as a stem cell transplant, uses strong chemotherapy drugs to kill the stem cells in your bone marrow that are creating diseased lymphocytes. Then healthy adult blood stem cells from a donor are infused into your blood, where they travel to your bone marrow and begin making healthy blood cells.
As new and more-effective drug combinations have been developed, bone marrow transplant has become less common in treating chronic lymphocytic leukemia. Still in certain cases, this may be a treatment option.
Treatments may be used alone or in combination with each other.