A prognosis is the doctor’s best estimate of how cancer will affect a person, and how it will respond to treatment. A prognostic factor is an aspect of the cancer or a characteristic of the person that the doctor will consider when making a prognosis. A predictive factor influences how a cancer will respond to a certain treatment.
CLL is more common in older adults. The average age of people diagnosed with CLL is approximately 70. CLL is uncommon in people under age 40 and very rare in children. It is estimated that 4,510 deaths (2,790 men and 1,720 women) from CLL will occur this year.
Chronic lymphocytic leukemia (CLL) is the most common chronic leukemia in adults. About 20,000 people in the United States will develop CLL this year, according to the American Cancer Society. The average age at diagnosis is 72. The disease is twice as common in men as women.