Leukemia

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An image of bone marrow of a patient with leukemia

Leukemia or leukaemia is a cancer of blood and bone marrow. When a person has leukemia, the body makes too many white blood cells (leukocytes).

There are many kinds of leukemia. Leukemias are part of a bigger group of diseases, the blood cancers (hematological neoplasms). Without treatment, leukemia may lead to death within weeks, months, or years. How long the person lives depends on the kind of leukemia.

In 2000, about 256,000 children and adults around the world developed some form of leukemia, and 209,000 died from it.[1] About 90% of all leukemias are seen in adults.[2]

Four major types[change | change source]

Leukemia can be either acute or chronic. Acute leukemia usually grows quickly. Chronic leukemia usually grows slowly.

Leukemia can also affect two different types of white blood cells. These are lymphoid cells and young granulocyte cells (which are called myelocytes).

For this reason, all of the different forms of leukemia are divided into four main types:

  • Acute lymphocytic leukemia (ALL) is the most common type of leukemia. It is common in young children but can also be seen in old people.
  • Chronic lymphocytic leukemia (CLL) is usually seen in people over the age of 55. Children almost never have this.
  • Acute myelogenous leukemia (AML) is seen more commonly in adults than in children.
  • Chronic myelogenous leukemia (CML) happens mostly in adults.

Causes and risk factors[change | change source]

The causes of most types of leukemia are not known. In general, all cancers have a breakdown in the normal way cell division is controlled. Most likely, the different kinds of leukemias have different causes. The known causes account for relatively few cases.[3] Most of the causes are outside our control.

Researchers believe that some things may influence whether a person develops leukemia:

Viruses that are believed to cause leukemia include:

Fanconi anemia is also a risk factor for developing acute myelogenous leukemia.

Treatment[change | change source]

Most cases of leukemia are treated with a number of drugs, which are usually combined into a chemotherapy program. In some cases, radiation therapies or bone marrow transplants are done.

References[change | change source]

  1. "WHO Disease and injury country estimates". World Health Organization. 2009. http://www.who.int/healthinfo/global_burden_disease/estimates_country/en/index.html. Retrieved 2009-11-11.
  2. "SEER Stat Fact Sheets: Leukemia". National Cancer Institute. 2011. http://seer.cancer.gov/statfacts/html/leuks.html#incidence-mortality. ""Approximately 10.8% were diagnosed under age 20""
  3. Ross J.A. et al (2002). "Diet and risk of leukemia in the Iowa Women's Health Study". Cancer Epidemiol. Biomarkers Prev. 11 (8): 777–81. PMID 12163333 . http://cebp.aacrjournals.org/content/11/8/777.long.