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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). Most of the oxygen is used to make leukocyctes. What occurs is that too little oxygen is left in the blood to make red blood cells, or to make other cells, controlling blood clotting. One of the main function of red blood cells is to moveoxygen.
There are many kinds of leukemia. Leukemias are part of a bigger group of diseases, the blood cancers (hematological neoplasms).
Untreated, leukemia will lead to death within weeks to months. Chronic leukemias can last for years.
Four major typesLeukemia can be either acute or chronic (medicine). Acute leukemia usually grows quickly. Chronic leukemia usually grows slowly.
Leukemia can alsoinvolve two different types of white blood cells. These are lymphoid cells and myeloid cells.
For this reason, all of the different forms of leukemia are categorized into four major 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 overthe age of 55. It almost never affects children.
Acute myelogenous leukemia (AML) occurs more commonly in adults, than in children.
Chronic myelogenous leukemia (CML) occurs more commonly in adults, as well.
[change]Causes and risk factorsAs of 2010, there is no known cause for all kinds of leukemia. Most likely, the different kinds of leukemias have different causes. The known causesaccount for relatively few cases.[1] Most of the causes cannot easily be influenced, and are outside the control of people. Researchers believe the following may influence the fact that a person develops leukemia:
Exposure to Ionizing radiation
Exposure to certain chemicals, for example benzene.
Certain viruses
Treatment with certain drugs that influence how cells develop; e.g.treatment of a tumor; Chemotherapy
Certain genetic factors.
Viruses that are suspected to cause leukemia include:
Human immunodeficiency virus or HIV
Human T-lymphotropic virus
Fanconi anemia is also a risk factor for developing acute myelogenous leukemia.
[change]TreatmentMost cases of leukemia are treated with a number of drugs, which are usually combined into a chemotherapy. In somecases, radiation therapies or bone marrow transplants are done.

LEUKEMIA Pronunciation (US):  | |
 Dictionary entry overview: What does leukemia mean? 
• LEUKEMIA (noun)  The noun LEUKEMIA has 1 sense:
1. malignant neoplasm of blood-forming tissues; characterized by abnormal proliferation of leukocytes; one of the four major types of cancer
  Familiarity information: LEUKEMIA used asa noun is very rare.

 Dictionary entry details 

• LEUKEMIA (noun)

Sense 1 | leukemia [BACK TO TOP] |
Meaning:
Malignant neoplasm of blood-forming tissues; characterized by abnormal proliferation of leukocytes; one of the four major types of cancer
Classified under:
Nouns denoting stable states of affairs
Synonyms:
cancer of the blood; leucaemia; leukaemia; leukemiaHypernyms ("leukemia" is a kind of...):
cancer; malignant neoplastic disease (any malignant growth or tumor caused by abnormal and uncontrolled cell division; it may spread to other parts of the body through the lymphatic system or the blood stream)
Hyponyms (each of the following is a kind of "leukemia"):
acute leukemia (rapidly progressing leukemia)
chronic leukemia (slowly progressing leukemia)lymphocytic leukemia (leukemia characterized by enlargement of lymphoid tissues and lymphocytic cells in the circulating blood)
histiocytic leukaemia; histiocytic leukemia; monoblastic leukaemia; monoblastic leukemia;monocytic leukaemia; monocytic leukemia (leukemia characterized by the proliferation of monocytes and monoblasts in the blood)
myeloblastic leukemia (a malignant neoplasm of...