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Leukemia is a type of cancer that affects the blood and bone marrow. Leukemia begins in a cell in the bone marrow. The cell undergoes a change and becomes a type of leukemia cell. Once the marrow cell undergoes a leukemic change, the leukemia cells may grow and survive better than normal cells.
The list of types of Leukemia mentioned in various sources includes: 1  Subtype by progression: Acute leukemia - gets worse quickly. Chronic leukemia - gets worse more slowly. 2  Type of cell affected: Lymphocytic leukemia - affecting lymphoid cells. Myelogenous leukemia - affecting myeloid cells.