Leukemia
Leukemia
Leukemia (American English) or leukaemia (British English) (from the Greek leukos λεύκος - white, and haima αίμα - blood) is a type of cancer of the blood or bone marrow characterized by an abnormal increase of immature white blood cells called "blasts". Leukemia is a broad term covering a spectrum of diseases. In turn, it is part of the even broader group of diseases affecting the blood, bone marrow, and lymphoid system, which are all known as hematological neoplasms.
In 2000, approximately 256,000 children and adults around the world developed some form of leukemia, and 209,000 died from it. About 90% of all leukemias are diagnosed in adults
Clinically and pathologically, leukemia is subdivided into a variety of large groups. The first division is between its acuteand chronic forms:
Additionally, the diseases are subdivided according to which kind of blood cell is affected. This split divides leukemias into lymphoblastic or lymphocytic leukemias and myeloid ormyelogenous leukemias:
Classification
Cell type
Acute
Chronic
Lymphocytic leukemia
(or "lymphoblastic")
Acute lymphoblastic leukemia (ALL)
Chronic lymphocytic leukemia (CLL)
Myelogenous leukemia
(also "myeloid" or "nonlymphocytic")
Acute myelogenous leukemia (AML)
(or Myeloblastic)
Chronic myelogenous leukemia (CML)