Chronic lymphocytic leukemia (CLL) is cancer of a type of white blood cells called lymphocytes. These cells are found in the bone marrow and other parts of the body. Bone marrow is the soft tissue in the center of bones that helps form all blood cells.
CLL causes a slow increase in a certain type of white blood cells called B lymphocytes, or B cells. Cancer cells spread through the blood and bone marrow. CLL can also affect the lymph nodes or other organs such as the liver and spleen. CLL eventually can cause the bone marrow to lose its function.
CLL; Leukemia - chronic lymphocytic (CLL)
The cause of CLL is unknown. There is no link to radiation. It is not clear whether certain chemicals cause CLL. But exposure to Agent Orange during the Vietnam War has been linked to a slight increased risk of developing CLL.
CLL usually affects older adults, especially those older than age 60. Persons under age 45 rarely get it. CLL is more common in whites than in other ethnic groups. It is more common in men than in women. Some persons with CLL have family members with the disease.
Symptoms usually develop slowly. CLL is often found by blood tests done in people for other reasons or who do not have any symptoms.
If your doctor discovers you have CLL, tests will be done to see how much the cancer has spread. This is called staging.
Tests that look at changes in DNA inside the cancer cells may also be done. Results from these tests and from staging tests help your doctor determine your treatment.
If you have early stage CLL, your doctor will monitor you closely. Usually, no medicines or other treatment is given for early-stage CLL, unless you have:
A high-risk or aggressive (grows quickly) type of CLL
Infections that keep coming back
Leukemia that is rapidly getting worse
Low red blood cells or platelet counts
Fatigue, loss of appetite, weight loss, or night sweats
Painful swollen lymph nodes
Chemotherapy medicines are used to treat CLL. Your doctor will determine which ones are right for you.
In rare cases, radiation is used for painful and enlarged lymph nodes.
Blood transfusions or platelet transfusions may be required if blood counts are low.
Bone marrow or stem cell transplantation may be used in younger patients with advanced or high-risk CLL. A transplant is the only therapy that offers a potential cure for CLL, but it also has risks. Your doctor will discuss the risks and benefits with you.
You can ease the stress of illness by joining a cancer support group. Sharing with others who have common experiences and problems can help you not feel alone.
How well a patient does depends on the stage of the cancer. About half of patients diagnosed in the early stages of CLL live more than 12 years.
Autoimmune hemolytic anemia
Bleeding from low platelet count
Hypogammaglobulinemia, a condition in which you have lower levels of antibodies, which increases your risk of infection
Other cancers, including a much more aggressive lymphoma (Richter's transformation)
Side effects of chemotherapy
When to Contact a Medical Professional
Call a health care provider if you develop enlarged lymph nodes or unexplained fatigue, bruising, excessive sweating, or weight loss.
Byrd JC, Flynn JM. Chronic lymphocytic leukemia. In: Niederhuber JE, Armitage JO, Doroshow JH, et al., eds. Abeloff's Clinical Oncology. 5th ed. Philadelphia, Pa: Elsevier Churchill Livingstone; 2013:chap 102.
National Cancer Institute: PDQ Chronic Lymphocytic Leukemia Treatment. Bethesda, Md: National Cancer Institute. Date last modified: April 19, 2013. Available at: http://www.cancer.gov/cancertopics/pdq/treatment/CLL/healthprofessional. Accessed: March 23, 2014.
National Comprehensive Cancer Network. NCCN Clinical Practice Guidelines in Oncology: Non-Hodgkin's Lymphomas. Version 2.2014. Available at: http://www.nccn.org/professionals/physician_gls/pdf/nhl.pdf. Accessed: March 23, 2014.
Yi-Bin Chen, MD, Leukemia/Bone Marrow Transplant Program, Massachusetts General Hospital. Also reviewed by David Zieve, MD, MHA, Isla Ogilvie, PhD, and the A.D.A.M. Editorial team.