Skip Navigation

About Chronic Lymphocytic Leukemia (CLL)

  • Chronic lymphocytic leukemia (CLL): a type of cancer in which the bone marrow makes too many lymphocytes (a type of white blood cell)

    Chronic lymphocytic leukemia (CLL) is a slowly progressing disease in which the bone marrow makes too many lymphocytes (a type of white blood cell). CLL is one of the most common types of leukemia in adults. It often occurs during or after middle age, and rarely occurs in children. Signs and symptoms of CLL include swollen lymph nodes and tiredness.

    Learn about chronic lymphocytic leukemia, and find information on how we support and care for people with CLL before, during, and after treatment.

    The following information is from the National Cancer Institute (NCI).


  • Services and Support at Dana-Farber

    patient and technician

    Becoming a Patient

    As a new Dana-Farber patient, find answers to questions about your first visit: what to bring, how to find us, where to park, and how to prepare.

    patient ratings pie chart

    How Our Blood Cancer Patients Rate Dana-Farber

    Take a look at our patient satisfaction survey results for our patients treated for various blood cancers.
    cover supportive resources brochure

    Support Services and Amenities

    We offer a wide range of services, from financial planning to creative arts to spiritual counsel, to support our patients through their cancer experiences.