Chronic lymphocytic leukemia (CLL) is a type of leukemia. Leukemia is cancer that affects the blood and bone marrow. Bone marrow is the spongy tissue inside bones where blood cells are made.

The term "chronic" in chronic lymphocytic leukemia refers to the slower progression of this cancer. CLL typically progresses more slowly than other types of leukemia. The term "lymphocytic" refers to the cells affected by the disease. The cells are a group of white blood cells called lymphocytes. Lymphocytes help your body fight infection.

Treatments for chronic lymphocytic leukemia may include a "watch and wait" approach, targeted therapy, chemotherapy, immunotherapy and bone marrow transplant, also known as bone marrow stem cell transplant. Other treatment options may include CAR-T cell therapy, radiation therapy and clinical trials. (https://www.mayoclinic.org/diseases-conditions/chronic-lymphocytic-leukemia/symptoms-causes/syc-20352428)