In this Article
- Leukemia facts*
- What is leukemia?
- What are the types of leukemia?
- Who is at risk for leukemia?
- What are symptoms of leukemia?
- How is leukemia diagnosed?
- How is leukemia treated?
- How does someone get a second opinion about leukemia treatment?
- What happens after treatment for leukemia?
- How important is nutrition and physical activity for leukemia patients?
- What sort of follow-up care do leukemia patients need?
- What are some sources of support?
- What research is being done for leukemia?
- What resources are available to patients with leukemia?
- Take the Leukemia Quiz!
- Cancer Prevention Slideshow
- Cancer Symptoms Women Ignore
- Leukemia FAQs
- Find a local Oncologist in your town
What is leukemia?
Leukemia is cancer that starts in the tissue that forms blood. To understand cancer, it helps to know how normal blood cells form.
Normal Blood Cells
Most blood cells develop from cells in the bone marrow called stem cells. Bone marrow is the soft material in the center of most bones.
Stem cells mature into different kinds of blood cells. Each kind has a special job:
White blood cells, red blood cells, and platelets are made from stem cells as the body needs them. When cells grow old or get damaged, they die, and new cells take their place.
The picture below shows how stem cells can mature into different types of white blood cells. First, a stem cell matures into either a myeloid stem cell or a lymphoid stem cell:
- A myeloid stem cell matures into a myeloid blast. The blast can form a red blood cell, platelets, or one of several types of white blood cells.
- A lymphoid stem cell matures into a lymphoid blast. The blast can form one of several types of white blood cells, such as B cells or T cells.
The white blood cells that form from myeloid blasts are different from the white blood cells that form from lymphoid blasts.
In a person with leukemia, the bone marrow makes abnormal white blood cells. The abnormal cells are leukemia cells.
Unlike normal blood cells, leukemia cells don't die when they should. They may crowd out normal white blood cells, red blood cells, and platelets. This makes it hard for normal blood cells to do their work.
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