Acute granulocytic leukemia
    
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Acute granulocytic leukemia

Definition

Acute myeloid leukemia (AML) is cancer that starts inside bone marrow, the soft tissue inside bones that helps form blood cells. The cancer grows from cells that would normally turn into white blood cells.

Acute means the disease develops quickly.

Alternative Names

Acute myelogenous leukemia; AML; Acute granulocytic leukemia; Acute nonlymphocytic leukemia (ANLL); Leukemia - acute myeloid (AML); Leukemia - acute granulocytic; Leukemia - nonlymphocytic (ANLL)

Causes

Acute myeloid leukemia (AML) is one of the most common types of leukemia among adults. This type of cancer is rare under age 40. It generally occurs around age 65. (This article focuses on AML in adults.)

AML is more common in men than women.

Persons with this type of cancer have abnormal cells inside their bone marrow. The cells grow very fast, and replace healthy blood cells. The bone marrow, which helps the body fight infections, eventually stops working correctly. Persons with AML become more prone to infections and have an increased risk for bleeding as the numbers of healthy blood cells decrease.

Most of the time, a doctor cannot tell you what caused AML. However, the following things are thought to lead to some types of leukemia, including AML:

  • Radiation
  • Certain chemicals (for example, benzene)
  • Certain chemotherapy drugs, including etoposide and drugs known as alkylating agents

Problems with your genes may also play a role in the development of AML.

You have an increased risk for AML if you have or had any of the following:

  • Exposure to radiation and chemicals
  • A weakened immune system (immunosuppression) due to an organ transplant
  • Blood disorders, including:

Symptoms

  • Abnormal menstrual periods
  • Bleeding from the nose
  • Bleeding gums
  • Bruising
  • Bone pain or tenderness
  • Fatigue
  • Fever
  • Paleness
  • Shortness of breath (gets worse with exercise)
  • Skin rash or lesion
  • Swollen gums (rare)
  • Weight loss

Exams and Tests

The doctor will perform a physical exam. There may be signs of a swollen spleen, liver, or lymph nodes.

A complete blood count (CBC) shows anemia and a low number of platelets. A white blood cell count (WBC) can be high, low, or normal.

Bone marrow aspiration will show if there are any leukemia cells.

If your doctor learns you do have this type of leukemia, further tests will be done to determine the specific type of AML. There are eight sub-types of AML. They range from M0 to M7, based on which blood cells are abnormal.

Treatment

Treatment involves using medicines to kill the cancer cells. This is called chemotherapy. But chemotherapy kills normal cells, too. This may cause side effects such as excessive bleeding and an increased risk for infection. Your doctor may want to keep you away from other people to prevent infection.

Other treatments for AML may include:

  • Antibiotics to treat infection
  • Transfusions of platelets to control bleeding
  • Red blood cell transfusions to fight anemia
  • Bone marrow transplant or stem cell transplant

Most types of AML are treated the same way. However, a form of AML called acute promyelocytic leukemia (APL) is treated with a medicine called all-trans retinoic acid (ATRA). This medicine helps leukemia cells grow into normal white blood cells.

The drug arsenic trioxide is approved for use in patients with APL who do not get better with ATRA or chemotherapy.

Support Groups

See also:

  • Cancer support group
  • Leukemia support group

Outlook (Prognosis)

When the signs and symptoms of AML go away, you are said to be in remission. Complete remission occurs in 70 - 80% of patients.

With treatment, younger patients with AML tend to do better than those who develop the disease at an older age. According to the American Cancer Society:

  • About 33% of adults under age 65 with AML live at least 5 years after they are diagnosed with the cancer.
  • The 5-year survival rate is much lower in older adults -- about 4% of persons over age 65 with AML live at least 5 years after diagnosis.

Experts say this is partly due to the fact that the body of a younger person may better tolerate strong chemotherapy medicines.

If the cancer does not come back (relapse) within 5 years of the diagnosis, you are considered permanently cured. Most of the time, the cancer returns within 2 years of diagnosis.

Possible Complications

Complications of AML and cancer treatment include severe infections and life-threatening bleeding. Sometimes, the cancer comes back (relapses) after treatment.

When to Contact a Medical Professional

Call for an appointment with your health care provider if you develop symptoms of AML.

Call your health care provider if you have AML and have a fever that will not go away or other signs of infection.

Prevention

If you work around radiation or chemicals linked to leukemia, you should always wear protective gear.

American Cancer Society. Cancer Facts and Figures 2007. Atlanta, GA: American Cancer Society; 2007.

Abeloff MD, Armitage JO, Niederhuber JE, Kastan MB, McKena WG. Clinical Oncology. 3rd ed. Orlando, Fl: Churchill Livingstone; 2004.

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