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Acute Myeloid Leukemia (AML): Introduction 

What is cancer?

Cancer is when cells in the body change and grow out of control. Your body is made up of tiny building blocks called cells. Normal cells grow when your body needs them, and die when your body does not need them any longer. Cancer is made up of abnormal cells that grow even though your body doesn’t need them. In most types of cancer, the abnormal cells grow to form a lump or mass called a tumor.

What is leukemia?

Leukemia is different from most other types of cancer. Leukemia is cancer that starts in the bone marrow, which is where new blood cells are made. Leukemia cells are early forms of blood cells, most often white blood cells. When a person has leukemia, the body makes too many abnormal blood cells. Leukemia cells do not usually form tumors, but they can travel with the blood all over the body. That means CLL can affect organs all over the body.

Two types of white blood cells can turn into leukemia:

  • Lymphoid cells (lymphocytes). This is called lymphocytic leukemia.

  • Myeloid cells (myelocytes). This is called myeloid or myelogenous leukemia.

Leukemia can also be either acute or chronic. Acute leukemia tends to grow very quickly and needs to be treated right away. Chronic leukemia often grows more slowly.

What is acute myeloid leukemia (AML)?

Acute myeloid leukemia (AML) is a type of leukemia that starts in very early forms of myelocytes, called myeloblasts (blasts). It’s also known as acute myelogenous leukemia. The blasts are most often early forms of white blood cells. In some cases they can be early red blood cells (megakaryocytes). 

As the leukemia cells grow, they can crowd out the normal cells in the bone marrow. This can lead to not enough of different types of blood cells. People with AML have too many white blood cells in their blood, but these cells are not normal and don't help fight infections. In fact, people with AML often get more infections than people without it. AML can also lead to not enough red blood cells. This condition is called anemia, and it can cause fatigue. AML can also lead to not enough platelets. This can lead to excess bleeding or bruising. 

AML is a type of acute leukemia. This means it tends to grow fast. It needs to be treated right away.

Subtypes of AML

AML comes in many subtypes. They are based on what type of cells the leukemia starts in, and how mature the cells are. Which subtype of AML you have can affect both your treatment and prognosis (outlook). The main system of subtypes includes:

  • M0. This is undifferentiated AML.

  • M1. This is myeloblastic leukemia with minimal maturation.

  • M2. This is myeloblastic leukemia with maturation.

  • M3. This is promyelocytic leukemia.

  • M4. This is myelomonocytic leukemia.

  • M4eo. This is myelomonocytic leukemia with eosinophilia.

  • M5. This is monocytic leukemia.

  • M6. This is erythroid leukemia.

  • M7. This is megakaryoblastic leukemia.

AML may be broken down into other subtypes with a different system from the World Health Organization (WHO). Ask your doctor which system he or she is using and what it means for you.

Talk with your healthcare provider

If you have questions about your AML, talk with your healthcare provider. Your healthcare provider can help you understand more about this type of leukemia.


Online Medical Reviewer: Alteri, Richard, M.D.
Online Medical Reviewer: Cunningham, Louise, RN
Last Review Date: 9/30/2015
© 2013 The StayWell Company, LLC. 800 Township Line Road, Yardley, PA 19067. All rights reserved. This information is not intended as a substitute for professional medical care. Always follow your healthcare provider's instructions.