Chronic myelogenous leukemia progresses slowly and usually occurs in people who are middle-aged and older, although it also can occur in children.
Bone marrow is the spongy tissue inside the large bones in the body.
Bone marrow cells are produced by immature immortal stem cells. White blood cells fight infection. Platelets make the blood clot. Chronic myelogenous leukemia affects the blasts that are developing into white blood cells called granuloctyes. The blasts do not mature and become too numerous.