Leukemia is a type of cancer. Cancer is a group of many related diseases. All cancers begin in cells, which make up blood and other tissues. Normally, cells grow and divide to form new cells as the body needs them. When cells grow old, they die, and new cells take their place.
Sometimes this orderly process goes wrong. New cells form when the body does not need them, and old cells do not die when they should. Leukemia is cancer that begins in blood cells.
Blood cells form in the bone marrow. Bone marrow is the soft material in the center of most bones.
Immature blood cells are called stem cells and blasts. Most blood cells mature in the bone marrow and then move into the blood vessels. Blood flowing through the blood vessels and heart is called the peripheral blood.
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The bone marrow makes different types of blood cells. Each type has a special function:
 | White blood cells help fight infection. |
 | Red blood cells carry oxygen to tissues throughout the body. |
 | Platelets help form blood clots that control bleeding. |
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