What is chronic myelogenous leukemia?
Chronic myelogenous leukemia (CML) is a rare, life-threatening cancer that affects the bone marrow. Marrow is the soft, fatty tissue inside the bones. The cancer can cause the number of white blood cells in the bone marrow to be 20 to 40 times higher than normal. These cancerous white blood cells crowd out healthy blood cells in the bone marrow.