Leukemia definitions

lo͝o-kē'mē-ə
Leukemia is a cancer that forms in the tissue that makes blood. In a person that has leukemia, the bone marrow makes abnormal white blood cells which are called leukemia cells. They crowd the normal cells, red blood cells, white blood cells, and platelets, and keep those cells from doing what they are supposed to do. There are two main types of leukemia.

Lymphocytic leukemia - affects the lymphocytes which make lymphatic tissue. This tissue makes up the immune system.

Myelogenous leukemia - affects the myeloid cells which make red and white blood cells and cells that make platelets.

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Each of these two types of leukemia can further be divided into two classifications - acute and chronic: Acute means the abnormal cells are immature, they multiply quickly, and so the disease becomes worse faster. The large numbers don’t leave room for the healthy cells, so the person develops anemia from a low red cell count, cannot fight infection because of the low white cell count, and bruises and bleeds easily because of the low platelet count.

Acute Myelogenous Leukemia (AML)

Acute Lymphocytic Leukemia (ALL)

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Chronic means there are fewer immature blast cells and more mature abnormal cells. They multiply slower that the others and function normally for a time. Eventually there are too many abnormal white cells and anemia forms as well as a decreased immune response.

Chronic Myelogenous Leukemia (CML)

Chronic Lymphocytic Leukemia (CLL)

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Any of various acute or chronic neoplastic diseases of the bone marrow in which unrestrained proliferation of white blood cells occurs, usually accompanied by anemia, impaired blood clotting, and enlargement of the lymph nodes, liver, and spleen.
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Any of a group of cancerous diseases of the blood-forming organs, resulting in an abnormal increase in the production of leukocytes, often accompanied by anemia and enlargement of the lymph nodes, spleen, and liver.
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Any of various acute or chronic neoplastic diseases of the bone marrow in which unrestrained proliferation of white blood cells occurs, usually accompanied by anemia, impaired blood clotting, and enlargement of the lymph nodes, liver, and spleen.
noun
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Any of various acute or chronic neoplastic diseases of the bone marrow in which unrestrained proliferation of white blood cells occurs, usually accompanied by anemia, impaired blood clotting, and enlargement of the lymph nodes, liver, and spleen. Certain viruses, genetic defects, chemicals, and ionizing radiation, are associated with an increased risk of leukemia, which is classified according to the cellular maturity of the involved white blood cells.
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(US) A type of malignancy affecting the blood cells or blood-forming tissues.
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(US, countable) Any specific form or type of cancer of the blood-forming tissues.

The subjects suffered from lymphoblastic and myeloid leukemias.

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Origin of leukemia

From German Leukämie, from Ancient Greek λευκός (leukos, “white") and αἷμα (haima, “blood").