Leukemia is a group of blood marrow diseases involving an uncontrolled increase in the white blood cells. Chronic leukemia is slow moving, while acute is a more quick moving form of cancer. The types of leukemia are grouped by the types of white blood cell that are affected.

There are four common types of leukemia:

Chronic lymphocytic leukemia is cancer of the white blood cells with a slow, progressive increase of these cells in the blood and bone marrow. It generally affects adults over the age of 55.

Chronic myeloid leukemia is a malignant cancer of the bone marrow that causes rapid growth of the blood-forming cells in the bone marrow, blood and body tissue. It mainly affects adults.

Acute lymphocytic leukemia is a progressive cancer with large numbers of immature white blood cells called lymphoblasts found in the blood, bone marrow, lymph nodes, spleen and other organs. It affects adults.

Acute myeloid leukemia or adult leukemia is cancer of the bone marrow with an increase of white blood cells. It occurs in both adults and children.


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