Chronic lymphoblastic leukemia (CLL) is a type of cancer that affects the lymphocytes, a type of white blood cell, in the bone marrow and lymph nodes. CLL is the most common type of adult leukemia, and is most often seen in people over the age of 55. However, it can also occur in younger adults and even children.
CLL is more common in males than in females, and is most common in Caucasians. It is also more common in people of Ashkenazi Jewish descent, and is seen at higher rates in parts of the world with higher levels of air pollution.
The exact cause of CLL is not known, but a number of genetic and environmental factors are believed to be involved. Research suggests that exposure to certain chemicals, such as benzene, have been linked to a higher risk of CLL.
CLL can be treated with chemotherapy, immunotherapy, radiation therapy, or a combination of these treatments. The prognosis for CLL is variable, and depends on a number of factors, including the age and overall health of the patient, the stage of the disease, and the response to treatment. In general, younger patients have a better prognosis than those over 55.