Adult acute lymphoblastic leukemia (ALL; also called acute lymphocytic leukemia) is a cancer of the blood and bone marrow. This type of cancer usually gets worse quickly if it is not treated. Enlarge. Anatomy of the bone. The bone is made up of compact bone, spongy bone, and bone marrow. Chronic lymphocytic leukemia (CLL) is the most common leukemia in adults. It's a type of cancer that starts in cells that become certain white blood cells (called lymphocytes) in the bone marrow. The cancer (leukemia) cells start in the bone marrow but then go into the blood. In .
Acute Lymphocytic Leukemia (ALL) in Adults Acute lymphocytic (or lymphoblastic) leukemia is sometimes called ALL. It starts in the bone marrow where blood cells are made. It is more common in children than in adults.